Journal of Alloys and Compounds最新文献

{"title":"A comprehensive exploration of structural relaxation phenomena in Sb-Se glasses","authors":"M. Včeláková, P. Honcová, R. Svoboda, P. Koštál, G. Sádovská, J. Málek","doi":"10.1016/j.jallcom.2025.181319","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.181319","url":null,"abstract":"The structural relaxation behavior of Sb-Se chalcogenide glasses (Sb content up to 6<!-- --> <!-- -->at.%) was comprehensively studied using differential scanning calorimetry, viscosity measurements, and Raman spectroscopy. Three distinct types of calorimetric experiments were employed to estimate and refine the parameters of the relaxation model involving nonlinearity and nonexponentiality. Viscosity measurements in the glass transition range confirmed similar compositional dependences of the activation energies for structural relaxation and viscous flow. Raman spectroscopy provided insights into the structural changes associated with relaxation, highlighting the formation of SbSe_3/2 pyramids and their effect on crosslinking within the glassy matrix. These findings elucidate the interplay between composition, thermal history, and relaxation behavior, offering predictive insights into the structure-property relationships of Sb-Se glasses.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"19 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144188950","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}

{"title":"Improving mechanical properties and corrosion resistance of Zn-Ni-Co ternary alloy coatings by exploring the optimum anomalous co-deposition process","authors":"Yunhu Ding, Ying He, Zixuan Xu, Tiansui Zhang, Haitao Duan, Hongfang Liu","doi":"10.1016/j.jallcom.2025.181327","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.181327","url":null,"abstract":"Establishment of optimum electrodeposition process parameters is essential to enhance the mechanical properties and corrosion resistance of Zn-Ni-Co ternary alloy anomalous co-deposited coatings. This study employs Hull cell experiments to delineate compositional evolution in ternary coatings, followed by systematic direct-current electrodeposition on carbon steel to quantify the [Ni²⁺]/[Co²⁺] molar ratio effects on performance metrics. Zn deposition dominated at higher current densities, while Co accumulation increased at lower currents. Ni catalyzed the deposition of both Zn and Co, while the reduction of itself was always inhibited. The increased Co content improved corrosion resistance and refined the grains, but decreased the cathodic current efficiency and coating thickness. Hardness enhancement might be attributed to grain refinement combined with phase-boundary strengthening. The best comprehensive performance was achieved by the coating with a [Ni²⁺]/[Co²⁺] ratio of 3:7, which obtained mechanical hardness of 5.24<!-- --> <!-- -->GPa, deposition efficiency of 77.4% and the <em>i</em>_corr of 2.301 μA/cm² in 3.5% NaCl solution at 30 ℃, suggesting high resistance to uniform corrosion for the Zn-Ni-Co coating. Compared to Zn-Ni coatings, the ternary alloy showed an 82.3% lower <em>i</em>_corr and 53.5% reduction in mass loss in NaCl + NaHSO₃ corrosive media.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"6 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144188921","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}

{"title":"High thermally stable Tm3+-doped alkali borosilicate glass: structure, Judd-Ofelt calculations, and near-pure blue light emission","authors":"Jianshan Yang, Nanshan Ma, Haozhang Liang, Juxia Tong, Longqing He, Xinzhu liu, Tingxiao Wu, Xianjun Feng, Zhiwei Luo, Anxian Lu","doi":"10.1016/j.jallcom.2025.181335","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.181335","url":null,"abstract":"SiO₂-B₂O₃-Na₂O-NaF-WO₃-La₂O₃ glasses doped with Tm₂O₃ were prepared using the melt-quenching method. The Tm³⁺-doped glasses were studied through XRD, DSC, FTIR, absorption spectroscopy, Judd-Ofelt (J-O) theory, and photoluminescence spectroscopy. According to the J-O theory, a high <em>Ω</em>_<em>2</em> value predicts a higher covalency between the Tm³⁺ and O^2- ions. Under 359<!-- --> <!-- -->nm excitation, all the glasses exhibit blue emission with a color purity above 99.26%. The emission intensity of the glass doped with 0.4<!-- --> <!-- -->mol% Tm2O3 reaches the highest and then decreases due to the concentration quenching. It is connected with the energy transfer between the Tm³⁺-Tm³⁺ ions, which is predominantly governed by dipole-dipole interactions according to the Inokuti-Hirayama (I-H) model. On this basis, the Yokota-Tanimoto model confirmed that, in addition to donor-acceptor interactions, donor-donor interactions become increasingly significant as the doping concentration increases, emerging as a crucial factor in concentration quenching. At 423<!-- --> <!-- -->K, the intensity of the glass retains 71% of its initial value, with a color shift ranging from 0.0002 to 0.0158, demonstrating its excellent luminescent thermal stability. In summary, the obtained glasses are candidate materials for LED fields, especially suitable for blue and white light display devices.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"2 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144188928","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}

{"title":"Modulation of the Reverse Saturable Absorption Properties of Bi2Te3 Nanostructures through Crystallinity Engineering","authors":"Junjie Pan, Bingxue Li, Shijie Zhai, Xuan Fang, Jianhua Liu, He Zhang, Dengkui Wang, Dan Fang, Hao Yan, Xuefeng Chu, Liang Guo, Jinhua Li, Hongbin Zhao, Xiaohua Wang","doi":"10.1016/j.jallcom.2025.181215","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.181215","url":null,"abstract":"Research on the nonlinear optical properties of two-dimensional materials has significantly progressed in recent years. Increasing the nonlinear absorption coefficient and further improvement of the saturable absorption process are important for both scientific research and practical nonlinear optical applications. Here, a type of high reverse saturable absorption (RSA) coefficient bismuth telluride (Bi₂Te₃) nanostructure was obtained by a rapid and convenient electrochemical exfoliation technique. As the crystalline structure amorphized, localized defect states were induced, which tuned and enhanced the RSA characteristics. Z-scan results revealed pronounced RSA behavior in the exfoliated Bi₂Te₃ nanostructures. Owing to the localized defect states, both the two-photon absorption and excited-state absorption processes were facilitated. Therefore, the nonlinear absorption coefficient increased from 18<!-- --> <!-- -->cm/GW (for the highest crystallinity sample) to 165<!-- --> <!-- -->cm/GW (for the lowest crystallinity sample), representing an approximately eightfold enhancement. Finally, an optical limiting experiment showed that the high RSA coefficient of Bi₂Te₃ can effectively reduce the optical limiting threshold.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"50 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144188929","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}

{"title":"Processing and microstructure of bioresorbable Zn/Mg multi-materials manufactured by additive friction stir deposition","authors":"Yidi Li, Biaobiao Yang, Juan Guillermo Santos Macías, Hui Wang, Yunping Li, Javier Llorca","doi":"10.1016/j.jallcom.2025.181342","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.181342","url":null,"abstract":"This work explores the development of novel Zn/Mg multi-materials for biomedical applications by leveraging the complementary properties of Mg (bone-matching elastic modulus, rapid degradation) and Zn (moderate strength, slower degradation rate). Additive friction stir deposition, a solid-state manufacturing process, is used to manufacture Zn/Mg multi-materials. Microstructural analysis reveals a well-defined three-layer interface structure consisting of a mixture of Mg + MgZn, nm-sized grains of MgZn₂, and nm-sized grains of Mg₂Zn₁₁ phases from the Mg side to the Zn side. The interface region was fully dense, free of cracks, and showed substantial capability of plastic accommodation which was able to relieve stress concentrations through different mechanisms. These findings highlight the potential of additive friction stir deposition to control the thickness and structure of the Zn/Mg interface and pave the way for the manufacturing of Zn/Mg multi-material components for biomedical applications.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"11 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144188954","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}

{"title":"Spectral Studies of Eu3+-Activated Na2Zn5Mo6O24: a Novel Red-Emitting Nanophosphor with High Quantum Efficiency and Thermal Stability","authors":"Yanlin Huang, Cong Xiang, Rui Xu, Jingyi Fang, Hyun Kyoung Yang","doi":"10.1016/j.jallcom.2025.181331","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.181331","url":null,"abstract":"This study investigates the development of a novel red-emitting nanophosphor, Eu³⁺-doped Na₂Zn₅Mo₆O₂₄, synthesized via a sol-gel method for optoelectronic applications. Eu³⁺ ions, known for the red luminescence via ⁵D₀ → ⁷F₂ hypersensitive transition (~615<!-- --> <!-- -->nm), face intrinsic limitations due to weak oscillation absorption in the UV to blue spectral range. To solve this problem, the effective excitation of Eu³⁺ ions in the near-ultraviolet wavelength range was achieved by using the molybdate host Na₂Zn₅Mo₆O₂₄. Structural analysis confirmed a triclinic phase (space group P-1) with phase purity across doping concentrations (x = 0.01–0.06). The nanophosphor exhibited intense red emission (CIE: 0.65, 0.34) under 395<!-- --> <!-- -->nm excitation, with a quantum efficiency (QE) of 68.5% and superior thermal stability (activation energy ΔE = 0.279<!-- --> <!-- -->eV). Optimal performance was observed at <em>x</em> = 0.05, balancing radiative efficiency and concentration quenching. Prototype LEDs integrating the nanophosphor demonstrated high color purity, and a warm-white LED achieved a color rendering index (CRI) of 90, validating its potential for solid-state lighting.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"6 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144188949","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}

{"title":"The Effect of Si Content on the Microstructure and Thermal Conductivity of Al-XSi-3Cu-5Mg Alloys Produced by Laser Additive Manufacturing","authors":"Yang Li, Shouren Wang, Zhen Xiao, Mingyang Du, Zhuang Zhang, Mengjun Liu, Peining Li","doi":"10.1016/j.jallcom.2025.181341","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.181341","url":null,"abstract":"High-silicon aluminum alloys are widely utilized in heat dissipation devices due to their outstanding thermophysical properties and represent a major focus in thermal management research. The incorporation of silicon imparts numerous beneficial attributes to the alloy; however, an excessive amount of silicon may result in a decline in thermal conductivity. To investigate the optimal silicon content within the alloy system, this study employed laser additive manufacturing to fabricate Al-Si-3Cu-5Mg alloys with varying silicon concentrations. Comprehensive microstructural characterization was conducted, alongside systematic evaluations of wear resistance and thermal performance. The results demonstrate that as the silicon content increases, hardness rises progressively from 134 HV to 326 HV, the friction coefficient decreases from 0.5 to approximately 0.22, and wear resistance is significantly enhanced. Meanwhile, thermal conductivity exhibits a linear decreasing trend, dropping from 227<!-- --> <!-- -->W/(m·K) to around 140<!-- --> <!-- -->W/(m·K), and shows an inverse relationship with the coefficient of thermal expansion. These phenomena are attributed to the complex interactions between silicon and the added copper and magnesium elements during the additive manufacturing process. This study provides valuable insights for optimizing alloy compositions to improve the efficiency of heat sinks in industrial applications. Furthermore, a mathematical model for calculating thermal conductivity is developed, and a thorough comparison with experimentally measured values indicates that the model offers a satisfactory interpretation of the experimental outcomes.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"26 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144188925","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}

{"title":"Preparation of Nd-reinforced N-doped Cu7S4 rich in sulfur vacancies for supercapacitors","authors":"Haifei Wang, Wenpeng Han, Fang Tian, Decui Yao, Shuzhen Liu, Jiaxin Wu, Hui Li, Jiatian Cao, Hanzhe Zheng, Xiaoyang Liu","doi":"10.1016/j.jallcom.2025.181321","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.181321","url":null,"abstract":"Introducing sulfur vacancies in transition metal sulfide-based electrode materials is an effective way to improve the electrochemical energy storage of the materials. Nd-reinforced N-doped Cu₇S₄ (Nd@N-Cu₇S₄) composite material, supported on nickel foam (NF), is synthesized by regulating the doping of Nd into the N-doped Cu₇S₄ materials. Regulating on the number of doped Nd atoms can change the concentration of sulfur vacancies produced in the N-doped Cu₇S₄ material. After introducing sulfur vacancies, the diffusion rate of ions and the number of reactive sites in the material are enhanced by altering the distribution of local electron concentrations around the sulfur vacancies during the electrochemical reaction process. This increases and improves the electrochemical energy storage of the Nd@N-Cu₇S₄ material. Theoretical calculations are carried out to study the influence of the generation of sulfur vacancies on the material structure. The Nd-reinforced N-doped Cu₇S₄ (Nd@N-Cu₇S₄) composite electrode exhibits a higher energy storage capacity than existing copper sulfide-based electrode materials and other ion-doped sulfides. To further investigate the practical application of Nd@N-Cu₇S₄/NF, a liquid-phase supercapacitor is constructed featuring a wide operational potential window of 1.8<!-- --> <!-- -->V. This device utilizes Nd@N-Cu₇S₄/NF as the negative electrode and Nd@N-Cu₇S₄/CF (carbon felt) as the positive electrode, with 1<!-- --> <!-- -->M NaOH serving as the electrolyte. The assembled supercapacitor demonstrates high energy density, emphasizing the potential of the Nd@N-Cu₇S₄/NF electrode in high-performance energy storage applications. These findings suggest that the Nd@N-Cu₇S₄/NF composite is a promising candidate for advancing the development of next-generation supercapacitors.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"52 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144188951","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}

{"title":"Reduction of Ilmenite and Preparation of Titanium-Based Carbides in the CH4-H2 System","authors":"Tingting Lv, Jianwei Song, Yunfei An, Tu Hu, Guo Lin","doi":"10.1016/j.jallcom.2025.181315","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.181315","url":null,"abstract":"Titanium carbide, which exhibits extensive applications across diverse fields, is the focus of this study on its synthesis from low-grade ilmenite in the CH₄-H₂ system. Taking the reduction temperature range of 1100 °C to 1350 °C as a starting point, a distinct \"M\"-shaped relationship between temperature and the carburizing rate is observed. Metallic iron is recognized as a crucial factor influencing the synthesis of titanium-based carbides from ilmenite, with its accumulation closely linked to the carburizing rate of the reduction products. At 1100 °C -1200 °C, increasing the temperature promotes the aggregation and growth of iron, resulting in an increased carburizing rate of the products. At 1225 °C -1300 °C, most of the metal iron dissolved carbon and transformed into molten state. As the temperature increases, the fluidity of the molten iron improves, allowing it to accumulate and grow, thereby reopening the pores in the matrix and rebounding the carburizing rate. At 1350 °C, the dripping of molten iron causes the pellets to soften and fall, leading to a sudden decrease in the product's carburizing rate. The morphological characteristics of reduced ilmenite pellets demonstrate that as the temperature increases, the wettability of metallic iron and carbide shifts from a non-wetting to a wetting. The reduced product-metallic iron-interconnects and aggregates the dispersed reduced ilmenite into a cohesive mass that encases the TiC_xO_1-x, which results in the incomplete carburization of the ilmenite. This study provides theoretical support for the preparation of carbides by gas-based reduction of ilmenite.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"34 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144188926","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}

{"title":"Synergistic effect of ultrasound-assisted and ZrO2 nanoparticle sealing on microstructure and mechanical properties of aluminum alloy micro-arc oxidation coating","authors":"Zhenhua Liu, Shuangshuang Zhi, Shubo Li, Zhiqiang Zhu, Ke Dai, Hailin Lu","doi":"10.1016/j.jallcom.2025.181338","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.181338","url":null,"abstract":"The coating prepared by the conventional micro-arc oxidation (MAO) process usually has a porous structure, which cannot effectively block the invasion of corrosive media, thus reducing corrosion resistance and wear resistance. In this study, composite oxide coatings were prepared on 6061 aluminum alloy by using ultrasound-assisted MAO technology and adding ZrO₂ nanoparticles in phosphate solution. The microstructure and elemental composition of the coating were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS), and the wear resistance and corrosion resistance were tested. The results show that under the synergistic effect of ultrasonic assistance and nanoparticle sealing, the porosity of the composite coating is reduced from 6.35% of the traditional MAO coating to 2.85%, the corrosion current density is three orders of magnitude lower than that of the substrate, and it has excellent wear resistance and density. These properties effectively improve the service life of the metal.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"67 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144188927","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}