Journal of Alloys and Compounds最新文献

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The oxidation mechanism of heterogeneous structured Cu-316L-xMo immiscible alloys by laser powder bed fusion 激光粉末床熔合制备Cu-316L-xMo非混相合金的氧化机理
IF 6.2 2区 材料科学
Journal of Alloys and Compounds Pub Date : 2025-10-19 DOI: 10.1016/j.jallcom.2025.184487
Cheng Deng, Zihao Wan, Tao Xie, Xinhua Wang, Shengfeng Zhou
{"title":"The oxidation mechanism of heterogeneous structured Cu-316L-xMo immiscible alloys by laser powder bed fusion","authors":"Cheng Deng, Zihao Wan, Tao Xie, Xinhua Wang, Shengfeng Zhou","doi":"10.1016/j.jallcom.2025.184487","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.184487","url":null,"abstract":"Cu-316L-<em>x</em>Mo immiscible alloys were manufactured by laser powder bed fusion (LPBF) in this work. The oxidation behavior of three types Cu-316L-<em>x</em>Mo alloys at 600 °C and 700 °C were studied to reveal the influence of Mo on the oxidation kinetics, oxide scale formation and integrity. The results showed that a heterogeneous oxide layer composed of CuO and Fe<sub>2</sub>O<sub>3</sub> was formed on the surface after oxidation, and locally varying oxide-thicknesses is observed due to the immiscibility of ε-Cu and γ-Fe phases. The incorporation of Mo ions into the oxide scale accelerates the oxidation rate of Cu–316L–<em>x</em>Mo alloys. The high volatility of MoO<sub>3</sub> compromises the integrity of the oxide scale, especially at higher temperature. Moreover, the growth and thermal stresses developed within the oxide scale during thermal cycling leads to severe cracking and spallation of the oxide scale.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"19 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145314718","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
MetaMode Deposition of Niobium Oxide Thin Films Using a Broad-Beam Ion Source 宽束离子源氧化铌薄膜的超模沉积
IF 6.2 2区 材料科学
Journal of Alloys and Compounds Pub Date : 2025-10-19 DOI: 10.1016/j.jallcom.2025.184505
Junwoo Lee, Yifan Liu, Carson Malhado, Ming Xu, Keliang Wang, Zhen Qiu, Shi-You Ding, Richard R. Lunt, Qi Hua Fan
{"title":"MetaMode Deposition of Niobium Oxide Thin Films Using a Broad-Beam Ion Source","authors":"Junwoo Lee, Yifan Liu, Carson Malhado, Ming Xu, Keliang Wang, Zhen Qiu, Shi-You Ding, Richard R. Lunt, Qi Hua Fan","doi":"10.1016/j.jallcom.2025.184505","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.184505","url":null,"abstract":"Niobium oxide (Nb<sub>2</sub>O<sub>5</sub>) thin films were deposited under MetaMode using a new broad-beam ion source-enhanced magnetron sputtering. The ion source significantly reduced the required oxygen concentration from over 20% to ~7.5% to form fully stoichiometric Nb<sub>2</sub>O<sub>5</sub> films. The MetaMode deposition rates were over three times higher than conventional reactive magnetron sputtering, which requires significantly higher oxygen concentrations. The film properties were characterized using UV-Vis spectroscopy, atomic force microscopy (AFM), scanning electron microscope (SEM), x-ray diffraction (XRD), x-ray photoelectron spectroscopy (XPS), four-point probe, and spectroscopic ellipsometry. The MetaMode deposited Nb<sub>2</sub>O<sub>5</sub> thin films exhibited smoother surfaces, better optical transmittance, and denser morphology, while overcoming the disappearing anode effect in conventional reactive sputtering.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"40 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145314732","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effect of 0.5 wt.% Cr on Precipitation Evolution and Recrystallization Behavior in Cu-Ni-Co-Si-Zn Alloys 0.5 wt.% Cr对Cu-Ni-Co-Si-Zn合金析出演变和再结晶行为的影响
IF 6.2 2区 材料科学
Journal of Alloys and Compounds Pub Date : 2025-10-19 DOI: 10.1016/j.jallcom.2025.184502
Liusen Yang, Haozhi Ao, Fangxin Yu, Yongqiang Zhou, Jianyi Cheng, Linnian Zhang, Jian Zhou, Jiaqiang Ding
{"title":"Effect of 0.5 wt.% Cr on Precipitation Evolution and Recrystallization Behavior in Cu-Ni-Co-Si-Zn Alloys","authors":"Liusen Yang, Haozhi Ao, Fangxin Yu, Yongqiang Zhou, Jianyi Cheng, Linnian Zhang, Jian Zhou, Jiaqiang Ding","doi":"10.1016/j.jallcom.2025.184502","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.184502","url":null,"abstract":"This study investigates the effects of 0.5<!-- --> <!-- -->wt.% Cr on precipitates, texture, recrystallization, and properties in Cu-Ni-Co-Si-Zn alloys. During melting, Cr promotes the formation of (Cr, Co)₃Si primary phases, which contribute to the refinement of the initial grains. The addition of Cr significantly increases the activation energy for second-phase precipitation by 46%, thereby retarding the precipitation kinetics by raising the nucleation energy barrier. However, in the early stage of aging, the co-precipitation of BCC-Cr (three variants) and δ-(Ni, Co, Cr)₂Si results in a multi-phase strengthening effect, markedly enhancing the peak hardness. Cr promotes the transformation of δ-(Ni, Co)₂Si into the more stable δ-(Ni, Co, Cr)₂Si phase and induces the precipitation of fully coherent β-(Ni, Co)₃Si, significantly delaying over-aging and enhancing hardness retention. The formation enthalpies of δ-(Ni, Co, Cr)₂Si and β-(Ni, Co)₃Si are lower than those of δ-(Ni, Co)₂Si and β-Ni₃Si, indicating that the Cr-containing precipitates exhibit stronger thermodynamic driving force and higher structural stability after overcoming the precipitation activation energy. The effect of Cr on grain exhibits a pronounced time-dependent behavior: during short-term aging (2<!-- --> <!-- -->h), Cr suppresses the precipitation of secondary phases, thereby increasing lattice distortion (KAM value increases by 3.4%), promoting the formation of Cube recrystallization texture (1.82), and weakening the Brass texture (from 5.89 to 4.29). After prolonged aging (20<!-- --> <!-- -->h), the 0.5Cr alloy retains a high precipitate density through suppressed coarsening, strengthening grain boundary pinning. As a result, the Brass texture (1.92) is retained, and the recrystallization fraction (2.0%) remains significantly lower than that of the 0Cr alloy (23.6%), ultimately leading to a mixed microstructure composed of recrystallization textures (Rt-C: 1.70, R: 2.43) and deformation textures inherited from cold rolling.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"15 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145314734","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Precursor-driven nucleation and texture control governing resistivity in low-temperature In2O3 films 前驱体驱动成核和织构控制对低温In2O3薄膜电阻率的影响
IF 6.2 2区 材料科学
Journal of Alloys and Compounds Pub Date : 2025-10-19 DOI: 10.1016/j.jallcom.2025.184504
Tae-Kyung Kim, Ji-Hyun Gwoen, Ju-Hwan Han, Hae-Dam Kim, Ji Min Kim, Tae-Heon Kim, Sang-Hyun Kim, Ki-Cheol Song, Jin-Seong Park
{"title":"Precursor-driven nucleation and texture control governing resistivity in low-temperature In2O3 films","authors":"Tae-Kyung Kim, Ji-Hyun Gwoen, Ju-Hwan Han, Hae-Dam Kim, Ji Min Kim, Tae-Heon Kim, Sang-Hyun Kim, Ki-Cheol Song, Jin-Seong Park","doi":"10.1016/j.jallcom.2025.184504","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.184504","url":null,"abstract":"Achieving low resistivity (ρ) and sufficient carrier mobility (μ) in In<sub>2</sub>O<sub>3</sub> thin films deposited by plasma-enhanced atomic layer deposition (PEALD) at ≤ 100 °C remains challenging due to limited crystallinity and grain-boundary scattering. This study demonstrates that precursor-controlled nucleation—rather than film thickness or bulk crystallinity—is the key factor governing carrier mobility and resistivity. Two indium precursors, DIP3 (MeIn(Pr)<sub>2</sub>NMe) and DIP4 (InMe<sub>3</sub>(THF)), were employed to investigate the growth, structure, and optoelectronic properties of In<sub>2</sub>O<sub>3</sub> films 30–100 nm thick. Characterization used grazing-incidence XRD, XPS, spectroscopic ellipsometry, UV–Vis, and van der Pauw Hall measurements.Films grown with DIP3, which exhibits a lower nucleation density, maintained a stable (222)/(400) texture up to 80 nm and achieved ρ = 1.1 × 10⁻³ Ω cm and FoM = 1.5 × 10⁻³ Ω⁻¹ without post-annealing. In contrast, DIP4 films showed an earlier onset of random orientation and a pronounced mobility decline beyond 50 nm, attributed to higher nucleation density. Increasing the number of DIP3 dosing pulses per ALD cycle raised the growth per cycle (GPC) by 0.04 Å/cycle and increased resistivity to 6.8 × 10⁻³ Ω cm, accompanied by a rise in the (411) peak intensity.These results confirm that accelerated nucleation promotes random grain orientation, thereby increasing resistivity and reducing mobility. All films exhibited &gt; 80% transmittance in the visible range. Overall, these findings highlight that reducing resistivity in low-temperature PEALD requires controlling nucleation and crystallographic texture rather than simply increasing film thickness.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"55 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145314733","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
On the formation and evolution dynamics of electron irradiation defects in magnesium using high-voltage electron microscopy 用高压电镜研究镁中电子辐照缺陷的形成与演化动力学
IF 6.2 2区 材料科学
Journal of Alloys and Compounds Pub Date : 2025-10-19 DOI: 10.1016/j.jallcom.2025.184501
Sichen Dong, Hui Liu, Xiaoou Yi, Pingping Liu, Kenji Ohkubo, Wentuo Han, Somei Ohnuki, Naoyuki Hashimoto, Farong Wan
{"title":"On the formation and evolution dynamics of electron irradiation defects in magnesium using high-voltage electron microscopy","authors":"Sichen Dong, Hui Liu, Xiaoou Yi, Pingping Liu, Kenji Ohkubo, Wentuo Han, Somei Ohnuki, Naoyuki Hashimoto, Farong Wan","doi":"10.1016/j.jallcom.2025.184501","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.184501","url":null,"abstract":"Utilizing a high-voltage electron microscope (HVEM), we conducted 1.25 MeV electron irradiations (RT, up to 0.54 dpa) and performed &lt;em&gt;in-situ&lt;/em&gt; observations of defect formation and evolution dynamics in commercial-purity magnesium. The irradiation induced both interstitial and vacancy-type loops. For the prism-foil (&lt;strong&gt;z&lt;/strong&gt; = [1&lt;span&gt;&lt;span style=\"\"&gt;&lt;/span&gt;&lt;span data-mathml='&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mover accent=\"true\" is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;mo is=\"true\"&gt;&amp;#x305;&lt;/mo&gt;&lt;/mover&gt;&lt;/math&gt;' role=\"presentation\" style=\"font-size: 90%; display: inline-block; position: relative;\" tabindex=\"0\"&gt;&lt;svg aria-hidden=\"true\" focusable=\"false\" height=\"2.317ex\" role=\"img\" style=\"vertical-align: -0.235ex;\" viewbox=\"0 -896.2 500.5 997.6\" width=\"1.162ex\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"&gt;&lt;g fill=\"currentColor\" stroke=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"&gt;&lt;g is=\"true\"&gt;&lt;g is=\"true\"&gt;&lt;g is=\"true\"&gt;&lt;use xlink:href=\"#MJMAIN-32\"&gt;&lt;/use&gt;&lt;/g&gt;&lt;/g&gt;&lt;g is=\"true\" transform=\"translate(29,189)\"&gt;&lt;text font-family=\"STIXGeneral,'Arial Unicode MS',serif\" stroke=\"none\" transform=\"scale(55.199) matrix(1 0 0 -1 0 0)\"&gt;̅&lt;/text&gt;&lt;/g&gt;&lt;/g&gt;&lt;/g&gt;&lt;/svg&gt;&lt;span role=\"presentation\"&gt;&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mover accent=\"true\" is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;mo is=\"true\"&gt;̅&lt;/mo&gt;&lt;/mover&gt;&lt;/math&gt;&lt;/span&gt;&lt;/span&gt;&lt;script type=\"math/mml\"&gt;&lt;math&gt;&lt;mover accent=\"true\" is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;mo is=\"true\"&gt;̅&lt;/mo&gt;&lt;/mover&gt;&lt;/math&gt;&lt;/script&gt;&lt;/span&gt;10]), preferential nucleation and growth of &lt;span&gt;&lt;span style=\"\"&gt;&lt;/span&gt;&lt;span data-mathml='&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mi is=\"true\"&gt;&amp;#x2159;&lt;/mi&gt;&lt;/math&gt;' role=\"presentation\" style=\"font-size: 90%; display: inline-block; position: relative;\" tabindex=\"0\"&gt;&lt;svg aria-hidden=\"true\" focusable=\"false\" height=\"2.432ex\" role=\"img\" style=\"vertical-align: -0.582ex;\" viewbox=\"0 -796.9 828 1047.3\" width=\"1.923ex\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"&gt;&lt;g fill=\"currentColor\" stroke=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"&gt;&lt;g is=\"true\"&gt;&lt;text font-family=\"STIXGeneral,'Arial Unicode MS',serif\" font-style=\"italic\" stroke=\"none\" transform=\"scale(55.199) matrix(1 0 0 -1 0 0)\"&gt;⅙&lt;/text&gt;&lt;/g&gt;&lt;/g&gt;&lt;/svg&gt;&lt;span role=\"presentation\"&gt;&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mi is=\"true\"&gt;⅙&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt;&lt;/span&gt;&lt;script type=\"math/mml\"&gt;&lt;math&gt;&lt;mi is=\"true\"&gt;⅙&lt;/mi&gt;&lt;/math&gt;&lt;/script&gt;&lt;/span&gt;&lt;&lt;span&gt;&lt;span style=\"\"&gt;&lt;/span&gt;&lt;span data-mathml='&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mn is=\"true\"&gt;20&lt;/mn&gt;&lt;mover accent=\"true\" is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;mo is=\"true\"&gt;&amp;#x305;&lt;/mo&gt;&lt;/mover&gt;&lt;mn is=\"true\"&gt;3&lt;/mn&gt;&lt;/math&gt;' role=\"presentation\" style=\"font-size: 90%; display: inline-block; ","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"70 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145314737","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Facile synthesis of a phosphorus-doped graphene/nickel-cobalt sulfide nanocomposite derived from metal-organic framework as a high-performance electrode material for supercapacitors 基于金属-有机骨架的掺磷石墨烯/硫化镍钴纳米复合材料的快速合成,作为超级电容器的高性能电极材料
IF 6.2 2区 材料科学
Journal of Alloys and Compounds Pub Date : 2025-10-19 DOI: 10.1016/j.jallcom.2025.184508
Milad Karami, Sayed Reza Hosseini, Shahram Ghasemi
{"title":"Facile synthesis of a phosphorus-doped graphene/nickel-cobalt sulfide nanocomposite derived from metal-organic framework as a high-performance electrode material for supercapacitors","authors":"Milad Karami, Sayed Reza Hosseini, Shahram Ghasemi","doi":"10.1016/j.jallcom.2025.184508","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.184508","url":null,"abstract":"In this study, a hierarchical phosphorus-doped graphene/NiCo₂S₄ (PGNCS) nanocomposite was rationally engineered as a high-performance electrode material for supercapacitors via a sequential solvothermal–calcination–sulfidation strategy. The design integrates phosphorus-doped graphene (PG) with a bimetallic NiCo-based metal–organic framework (MOF) precursor, synergistically combining high electrical conductivity with abundant and accessible redox-active sites. Comprehensive characterizations-including XRD, BET, FT-IR, Raman, TEM, FE-SEM, and EDS mapping-confirm the successful formation of a porous, well-anchored architecture with uniformly distributed elements. Electrochemical measurements reveal outstanding performance, delivering a high specific capacitance of 1340<!-- --> <!-- -->F<!-- --> <!-- -->g⁻¹ at 1<!-- --> <!-- -->A<!-- --> <!-- -->g⁻¹ (GCD) and 767<!-- --> <!-- -->F<!-- --> <!-- -->g⁻¹ at 5<!-- --> <!-- -->mV<!-- --> <!-- -->s⁻¹ (CV), along with excellent cycling stability (⁓91% capacitance retention after 5000 cycles). The superior charge-storage capability originates from the synergistic interaction between the conductive PG scaffold and the highly active NiCo₂S₄ phase, which together facilitate rapid electron/ion transport and enhance Faradaic utilization. This work highlights PGNCS as a promising and rationally designed electrode material for next-generation energy storage devices.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"102 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145314735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Sm3+ doped novel Sr3In2Ge3O12 orange-red emitting phosphor for WLEDs with high color purity and color rendering index Sm3+掺杂的新型Sr3In2Ge3O12橙红色发光荧光粉具有较高的色纯度和显色指数
IF 6.2 2区 材料科学
Journal of Alloys and Compounds Pub Date : 2025-10-18 DOI: 10.1016/j.jallcom.2025.184494
Xingliao Xu, Changyan Ji, Zhi Huang, Xiuying Tian, Hongxia Peng, Tiebin Wu, Hongping Qiu, Jin Wen, Hua-Tay Lin
{"title":"Sm3+ doped novel Sr3In2Ge3O12 orange-red emitting phosphor for WLEDs with high color purity and color rendering index","authors":"Xingliao Xu, Changyan Ji, Zhi Huang, Xiuying Tian, Hongxia Peng, Tiebin Wu, Hongping Qiu, Jin Wen, Hua-Tay Lin","doi":"10.1016/j.jallcom.2025.184494","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.184494","url":null,"abstract":"To address the limitations of conventional white light emitting diodes (WLEDs), such as insufficient red light components and low color rendering index (<em>R</em><sub>a</sub>), a series of Sm<sup>3+</sup> doped germanate orange red phosphors Sr<sub>3-<em>x</em></sub>In<sub>2</sub>Ge<sub>3</sub>O<sub>12</sub>:<em>x</em>Sm<sup>3+</sup> (0 ≤ <em>x</em> ≤ 0.14) were synthesized via high-temperature solid-state reaction in this study. The systematic characterizations of their structure and optical properties were performed. The results indicate that all samples belong to the cubic crystal system with space group <em>I</em>a-3d, where Sm<sup>3+</sup> successfully occupies the [SrO<sub>8</sub>] polyhedral sites. XRD refinement and EDS analysis indicate the formation of the target phase Sr<sub>3</sub>In<sub>2</sub>Ge<sub>3</sub>O<sub>12</sub>:Sm<sup>3+</sup>, with the presence of a small amount of impurity phase. Upon excitation with 404<!-- --> <!-- -->nm near-ultraviolet light, the germanate phosphors exhibited a characteristic orange red emission at 563<!-- --> <!-- -->nm, attributing to the <sup>4</sup>G<sub>5/2</sub>→<sup>6</sup>H<sub>5/2</sub> transition of Sm<sup>3+</sup>. The optimal doping concentration was determined to be <em>x</em> = 0.1, yielding CIE 1931 coordinates of (0.506, 0.491) in the orange-red region with 94.2% color purity. The concentration quenching mechanism is electric dipole-dipole interaction with the critical distance <em>R</em><sub>c</sub> = 17.2<!-- --> <!-- -->Å. The Sr<sub>2.9</sub>In<sub>2</sub>Ge<sub>3</sub>O<sub>12</sub>:0.1Sm<sup>3+</sup> exhibits millisecond-level photoluminescence (PL) lifetime and excellent thermal stability, retaining 69% of its room-temperature PL intensity at 250 ℃. WLEDs assembled with this as the orange-red component demonstrate stable electroluminescence (EL), retaining 82% of initial EL intensity after 12<!-- --> <!-- -->hours of continuous operation, with the <em>R</em><sub>a</sub> as high as 90. This study leverages the rigid framework and high ionic compatibility of the germanate host to achieve both high color purity and excellent thermal stability, providing a novel orange red candidate material for high-color-rendering WLEDs.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"1 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145311543","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Advancing Low-Magnetic Concrete: Microstructural and Magnetic Analysis of Raw Materials for Residual Magnetization Control 先进低磁混凝土:残余磁化控制原料的微观结构和磁性分析
IF 6.2 2区 材料科学
Journal of Alloys and Compounds Pub Date : 2025-10-18 DOI: 10.1016/j.jallcom.2025.184495
Jianguang Xu, Lei Kuang, Yongsheng Li, Yalu Zuo, Xi Guo, Qi Zhang, Li Xi
{"title":"Advancing Low-Magnetic Concrete: Microstructural and Magnetic Analysis of Raw Materials for Residual Magnetization Control","authors":"Jianguang Xu, Lei Kuang, Yongsheng Li, Yalu Zuo, Xi Guo, Qi Zhang, Li Xi","doi":"10.1016/j.jallcom.2025.184495","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.184495","url":null,"abstract":"The escalating demand for low-magnetic building solutions in sensitive experimental facilities and high-precision instrumentation sectors underscores the critical limitations of traditional concrete materials. Traditional reinforced concrete structures primarily introduce residual magnetic interference via two main avenues: ferromagnetic reinforcement materials and iron-containing oxides inherent in cement-based binders. While the former can be substituted with non-ferrous alternatives, a comprehensive characterization of the types of iron oxides and the mechanism of residual magnetization in the latter remains elusive. This study pioneers a multidisciplinary research approach, integrating advanced microstructural and magnetic analysis techniques to establish a quantitative correlation between the composition of concrete raw materials and their magnetic properties. The saturation magnetization, crystal structure, iron valence state, and magnetic hysteresis behavior of samples from various cements, ground granulated blast furnace slag (GGBS), and fly ash were thoroughly evaluated. The results reveal that fly ash raw materials exhibited the highest iron content (3.43%) and saturation magnetization (0.71<!-- --> <!-- -->emu/g), while GGBS raw materials showed the lowest iron content (0.22% Fe) and saturation magnetization (0.16<!-- --> <!-- -->emu/g). Furthermore, magnetic separation effectively reduce residual magnetic fields, with GGBS samples achieving a low residual magnetic environment (remanence as low as 19.7 nT) after magnetization at 30 mT. Microstructural and magnetic analysis of separated magnetic substances indicate that magnetite (Fe₃O₄) and a small amount of maghemite (α-Fe₂O₃) are the primary contributors to magnetic behavior. Notably, the judicious selection of low-iron content concrete raw materials and/or the application of magnetic separation technology can substantially diminish the residual magnetization characteristics of these materials, offering a promising avenue for the formulation of low-magnetic concrete. This study elucidates the source and removal methodologies for the magnetic properties of concrete raw materials, laying a solid foundation for developing low-magnetic building materials tailored for magnetic control environments.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"1 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145314749","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
High-temperature oxidation behaviors of Co-50Ni-10Al-6Ta-8Cr superalloy Co-50Ni-10Al-6Ta-8Cr高温合金的高温氧化行为
IF 6.2 2区 材料科学
Journal of Alloys and Compounds Pub Date : 2025-10-18 DOI: 10.1016/j.jallcom.2025.184492
Yupeng Zhang, Cuiping Wang, Xiang Yu, Chen Yang, Jinbin Zhang, Shuiyuan Yang, Xingjun Liu
{"title":"High-temperature oxidation behaviors of Co-50Ni-10Al-6Ta-8Cr superalloy","authors":"Yupeng Zhang, Cuiping Wang, Xiang Yu, Chen Yang, Jinbin Zhang, Shuiyuan Yang, Xingjun Liu","doi":"10.1016/j.jallcom.2025.184492","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.184492","url":null,"abstract":"The oxidation behavior of Al and Cr is crucial to the high-temperature oxidation resistance of superalloys. This work investigates the oxidation behavior of Co-50Ni-10Al-6Ta-8Cr alloy in air at 1000°C as a case study, using multi-scale characterization techniques to explore the types of oxides and competiting mechanisms. Experimental results show that the Co-50Ni-10Al-6Ta-8Cr alloy exhibits good oxidation resistance, with weight gain following a parabolic law. After 25<!-- --> <!-- -->hours of oxidation, the oxide film consists of three layers—a (Co, Ni)O layer, an α-Al₂O₃ layer and a τ + γ phase layer. After 200<!-- --> <!-- -->hours of oxidation, the oxide film consists of a (Co, Ni)O layer, a Cr<sub>2</sub>O<sub>3</sub> + CrTaO<sub>4</sub> layer, an α-Al<sub>2</sub>O<sub>3</sub> + γ layer and an AlN + τ phase layer. It is found that during the initial oxidation stage, the α-Al<sub>2</sub>O<sub>3</sub> layer serves as the primary oxidation barrier, whereas in the later stage, the Cr<sub>2</sub>O<sub>3</sub> + CrTaO<sub>4</sub> layer exhibits superior oxidation resistance. Moreover, the Cr<sub>2</sub>O<sub>3</sub> + CrTaO<sub>4</sub> layer effectively reduces the oxygen partial pressure inside the oxide scale but was unable to suppress the inward diffusion of nitrogen, leading to the formation of AlN.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"36 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145311542","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Enhanced Acoustic Phonon Scattering via engineering the Interface in MoS₂/CuS Nanocomposites for Ultra-Low Thermal Conductivity 超低导热MoS 2 / cu纳米复合材料界面工程增强声子散射
IF 6.2 2区 材料科学
Journal of Alloys and Compounds Pub Date : 2025-10-18 DOI: 10.1016/j.jallcom.2025.184493
M. Arockia Jenisha, S. Harish, J. Archana, M. Navaneethan
{"title":"Enhanced Acoustic Phonon Scattering via engineering the Interface in MoS₂/CuS Nanocomposites for Ultra-Low Thermal Conductivity","authors":"M. Arockia Jenisha, S. Harish, J. Archana, M. Navaneethan","doi":"10.1016/j.jallcom.2025.184493","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.184493","url":null,"abstract":"Significant advancements in power factor are widely realized in bulk thermoelectric materials through strategies such as doping, band engineering, and nanostructuring. We report the first demonstration of simultaneous enhancement of the Seebeck coefficient and electrical conductivity in <em>p</em>-type MoS₂/CuS nanocomposites through precise compositional tuning that activates a strong energy filtering effect. Leveraging the phonon liquid electron crystal (PLEC) nature of CuS, our approach delivers synergistic optimization of charge and phonon transport. The optimized 20<!-- --> <!-- -->wt% CuS composite achieves a high electrical conductivity of 893 Scm<sup>-1</sup> and a power factor of 41 μWm<sup>-1</sup>K<sup>-2</sup> at 653<!-- --> <!-- -->K, attributed to increased Cu<sup>2+</sup> ion concentration and a high density of states near the Fermi level (~0.2<!-- --> <!-- -->eV) enabled by band structure modulation. At the same temperature, the material also exhibits an ultra-low thermal conductivity of 0.2 Wm<sup>-1</sup>K<sup>-1</sup> due to intensified acoustic and interfacial phonon scattering. This synergistic control of electronic and thermal transport represents a novel strategy for mid-temperature thermoelectric materials design, positioning MoS₂/CuS nanocomposites as promising candidates for next-generation power generation systems.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"10 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145311605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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