Journal of Alloys and Compounds最新文献

{"title":"Study on the interface behavior of Ta10W/AlCoCrFeNi2.1 high-entropy matrix composites fabricated by fast hot pressing sintering","authors":"Longnan Jiang, Hongsheng Chen, Xinlei Zhang, Peiheng Wu","doi":"10.1016/j.jallcom.2025.183707","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.183707","url":null,"abstract":"Ta₁₀W particles were prepared as reinforcement to fabricate AlCoCrFeNi_2.1 high-entropy matrix composites by fast hot pressing sintering at different temperatures in this paper. This study investigates the microstructure and mechanical properties of sintered high-entropy matrix composites, with a focus on analyzing the interfacial behavior and strengthening mechanisms involved in the sintering process. The results demonstrate that there are no obvious defects in the composites, and the Ta₁₀W particles are uniformly dispersed in the high-entropy matrix. The well-bound interfacial layer indicates that there is good wettability between the reinforced particles and the HEA matrix, and the thickness of the interfacial layer increases with the increase of sintering temperature. Under varying sintering temperatures, the matrix and reinforced particles maintain stable microhardness (~370 HV and ~340 HV, respectively), while the interface hardness rises significantly from ~450 HV to 550 HV. The composite’s yield strength and tensile strength remain nearly unchanged, but its ductility improves markedly—elongation nearly doubles (from 4.25% to 7.57%) as temperature increases from 950 °C to 1050 °C. The strengthening mechanisms include load transfer, dislocation, solid solution strengthening, and the diffusion layer’s crack propagation hindrance.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"26 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145043196","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":"Split Hopkinson pressure bar and Taylor impact responses of dual-phase high-entropy alloy Al0.3CoCrFeNiTi0.3: Experiments and constitutive modeling","authors":"X. Xu, L. Wang, S.H. Guo, C. Li, N.B. Zhang, Q.C. Liu, L.X. Li, J. Xu, S.N. Luo","doi":"10.1016/j.jallcom.2025.183544","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.183544","url":null,"abstract":"Split Hopkinson pressure bar (SHPB) and Taylor impact experiments are conducted on an as-cast, dual-phase high-entropy alloy, <span><span style=\"\"></span><span data-mathml='<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow is=\"true\"><msub is=\"true\"><mrow is=\"true\"><mi mathvariant=\"normal\" is=\"true\">Al</mi></mrow><mrow is=\"true\"><mn is=\"true\">0</mn><mo is=\"true\">.</mo><mn is=\"true\">3</mn></mrow></msub><msub is=\"true\"><mrow is=\"true\"><mtext is=\"true\">CoCrFeNiTi</mtext></mrow><mrow is=\"true\"><mn is=\"true\">0</mn><mo is=\"true\">.</mo><mn is=\"true\">3</mn></mrow></msub></mrow></math>' role=\"presentation\" style=\"font-size: 90%; display: inline-block; position: relative;\" tabindex=\"0\"><svg aria-hidden=\"true\" focusable=\"false\" height=\"2.432ex\" role=\"img\" style=\"vertical-align: -0.582ex;\" viewbox=\"0 -796.9 8504.5 1047.3\" width=\"19.752ex\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"><g fill=\"currentColor\" stroke=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><g is=\"true\"><g is=\"true\"><g is=\"true\"><g is=\"true\"><use xlink:href=\"#MJMAIN-41\"></use><use x=\"750\" xlink:href=\"#MJMAIN-6C\" y=\"0\"></use></g></g><g is=\"true\" transform=\"translate(1029,-150)\"><g is=\"true\"><use transform=\"scale(0.707)\" xlink:href=\"#MJMAIN-30\"></use></g><g is=\"true\" transform=\"translate(353,0)\"><use transform=\"scale(0.707)\" xlink:href=\"#MJMAIN-2E\"></use></g><g is=\"true\" transform=\"translate(550,0)\"><use transform=\"scale(0.707)\" xlink:href=\"#MJMAIN-33\"></use></g></g></g><g is=\"true\" transform=\"translate(2033,0)\"><g is=\"true\"><g is=\"true\"><use xlink:href=\"#MJMAIN-43\"></use><use x=\"722\" xlink:href=\"#MJMAIN-6F\" y=\"0\"></use><use x=\"1223\" xlink:href=\"#MJMAIN-43\" y=\"0\"></use><use x=\"1945\" xlink:href=\"#MJMAIN-72\" y=\"0\"></use><use x=\"2338\" xlink:href=\"#MJMAIN-46\" y=\"0\"></use><use x=\"2991\" xlink:href=\"#MJMAIN-65\" y=\"0\"></use><use x=\"3436\" xlink:href=\"#MJMAIN-4E\" y=\"0\"></use><use x=\"4186\" xlink:href=\"#MJMAIN-69\" y=\"0\"></use><use x=\"4465\" xlink:href=\"#MJMAIN-54\" y=\"0\"></use><use x=\"5187\" xlink:href=\"#MJMAIN-69\" y=\"0\"></use></g></g><g is=\"true\" transform=\"translate(5466,-150)\"><g is=\"true\"><use transform=\"scale(0.707)\" xlink:href=\"#MJMAIN-30\"></use></g><g is=\"true\" transform=\"translate(353,0)\"><use transform=\"scale(0.707)\" xlink:href=\"#MJMAIN-2E\"></use></g><g is=\"true\" transform=\"translate(550,0)\"><use transform=\"scale(0.707)\" xlink:href=\"#MJMAIN-33\"></use></g></g></g></g></g></svg><span role=\"presentation\"><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow is=\"true\"><msub is=\"true\"><mrow is=\"true\"><mi is=\"true\" mathvariant=\"normal\">Al</mi></mrow><mrow is=\"true\"><mn is=\"true\">0</mn><mo is=\"true\">.</mo><mn is=\"true\">3</mn></mrow></msub><msub is=\"true\"><mrow is=\"true\"><mtext is=\"true\">CoCrFeNiTi</mtext></mrow><mrow is=\"true\"><mn is=\"true\">0</mn><mo is=\"true\">.</mo><mn is=\"true\">3</mn></mrow></m","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"64 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145043297","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":"Identification of structural, optical, magnetic, and dielectric properties of)1-x)Ba0.5Sr0.5Fe12O19/(x)SnFe2O4","authors":"M. Matar, O. Neamatallah, R. Awad, E.M. El-Maghraby, A.I. Abou‑Aly, A. Khalaf","doi":"10.1016/j.jallcom.2025.183703","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.183703","url":null,"abstract":"The structural, morphological, optical, magnetic, and dielectric properties of the soft ferrite SnFe<sub>2</sub>O<sub>4</sub> (SFO), the hard ferrite Ba<sub>0.5</sub>Sr<sub>0.5</sub>Fe<sub>12</sub>O<sub>19</sub> (BaSrFO), and their nanocomposite of (1-x)Ba<sub>0.5</sub>Sr<sub>0.5</sub>Fe<sub>12</sub>O<sub>19</sub>/ (x) SnFe<sub>2</sub>O<sub>4</sub> with <span><span><math><mn is=\"true\">0.0</mn><mo is=\"true\">≤</mo><mi is=\"true\">x</mi><mo is=\"true\">≤</mo><mn is=\"true\">1.0</mn></math></span><script type=\"math/mml\"><math><mn is=\"true\">0.0</mn><mo is=\"true\">≤</mo><mi is=\"true\">x</mi><mo is=\"true\">≤</mo><mn is=\"true\">1.0</mn></math></script></span> have been investigated in this study. The samples were synthesized via co-precipitation and ball milling methods. X-ray diffractometer (XRD), energy dispersive X-ray (EDX), transmission electron microscopy (TEM), and X-ray photoelectric spectroscopy (XPS) analysis validated the formation of BaSrFO and SFO ferrites and their co-existence in nanocomposites. UV–visible spectroscopy revealed a band gap between 2.828 and 3.116<!-- --> <!-- -->eV, indicating suitability for photocatalytic and optoelectronic applications. Vibrating sample magnetometer (VSM) analysis showed that the addition of SFO promoted dominant dipolar interactions and a weak exchange coupling interaction, as confirmed by the presence of two peaks of the switching field distribution (SFD). Consequently, the maximum energy product (BH)max decreases. Dielectric characteristics were investigated up to 5<!-- --> <!-- -->MHz in the temperature range of 323 to 523<!-- --> <!-- -->K for all samples. The frequency and temperature-dependent dielectric constants were significantly reliant on compositional ratios. Impedance spectra <span><span><math><mo is=\"true\" stretchy=\"false\">(</mo><msup is=\"true\"><mrow is=\"true\"><mi is=\"true\">Z</mi></mrow><mrow is=\"true\"><mo is=\"true\">*</mo></mrow></msup><mo is=\"true\" stretchy=\"false\">(</mo><mi is=\"true\">ω</mi><mo is=\"true\">,</mo><mi is=\"true\">T</mi><mo is=\"true\" stretchy=\"false\">)</mo><mo is=\"true\" stretchy=\"false\">)</mo></math></span><script type=\"math/mml\"><math><mo stretchy=\"false\" is=\"true\">(</mo><msup is=\"true\"><mrow is=\"true\"><mi is=\"true\">Z</mi></mrow><mrow is=\"true\"><mo is=\"true\">*</mo></mrow></msup><mo stretchy=\"false\" is=\"true\">(</mo><mi is=\"true\">ω</mi><mo is=\"true\">,</mo><mi is=\"true\">T</mi><mo stretchy=\"false\" is=\"true\">)</mo><mo stretchy=\"false\" is=\"true\">)</mo></math></script></span> and complex electric modulus spectra <span><span><math><mo is=\"true\" stretchy=\"false\">(</mo><msup is=\"true\"><mrow is=\"true\"><mi is=\"true\">M</mi></mrow><mrow is=\"true\"><mo is=\"true\">*</mo></mrow></msup><mrow is=\"true\"><mfenced close=\")\" is=\"true\" open=\"(\"><mrow is=\"true\"><mi is=\"true\">ω</mi><mo is=\"true\">,</mo><mi is=\"true\">T</mi></mrow></mfenced></mrow><mo is=\"true\" stretchy=\"false\">)</mo></math></span><script type=\"math/mml\"><math><mo stretchy=\"false\" is=\"true\">(</mo><msup is=\"true\"><mrow is=\"true\"><mi is=\"true\">M</mi></m","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"164 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145043248","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":"Study on the Co-firing Behavior of ZST-Z1N1-NZ Multilayer Structures","authors":"Jiahao Liu, Xiangchun Liu, Qi Wu, Miao Zhang, Danni Chen, Ziyao Wei, Jiahui Wang, Hao Zhou, Yujun Bai, Feng Gao","doi":"10.1016/j.jallcom.2025.183726","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.183726","url":null,"abstract":"(Zr_0.8Sn_0.2)TiO₄ (ZST) microwave dielectric ceramic powders were prepared by a hydrothermal-molten salt method at 1000 °C. The co-firing compatibility between (Zr_0.8Sn_0.2)TiO₄ (ZST) microwave dielectric ceramics and NiZn (NZ) ferrites was investigated. To reduce the sintering temperature of ZST, 2<!-- --> <!-- -->wt% ZnO and 2<!-- --> <!-- -->wt% Bi₂O₃ were added as sintering aids, which is abbreviated as ZSTC. An interlayer material Z1N1 (with a mass ratio of ZST to NZ of 1:1) was designed to reduce the shrinkage difference between ZST and NZ. Laminated composites of ZST-Z1N1-NZ were prepared by hot-pressing and dry-pressing forming processes respectively, and their microstructure, interfacial diffusion behavior, and dielectric properties (1<!-- --> <!-- -->MHz) were studied. The results show that the samples prepared by hot-pressing have a better microstructure and exhibit better dielectric properties. The introduction of the Z1N1 interlayer significantly improves the interfacial bonding, reduces cracks, and lowers the optimal sintering temperature from 1275 °C to 1250 °C. The dielectric constant is 34.3, and the dielectric loss is reduced by an order of magnitude from 10^-1 to 10^-2.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"131 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145043730","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":"Analysis of viscous flow mechanism from the standpoint of consolidation pressure and heating rate during consolidation of an Fe-based metallic glass powder via spark plasma sintering","authors":"","doi":"10.1016/j.jallcom.2025.183717","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.183717","url":null,"abstract":"Understanding the role of sintering parameters on densification kinetics of metallic glass powders can serve as a pathway for successful synthesis of …","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"50 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145043200","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":"A study of the properties of ZrNiSb defective half-Heusler alloy for thermoelectric and spintronic applications","authors":"Joseph Ngugi Kahiu, Ho Seong Lee","doi":"10.1016/j.jallcom.2025.183729","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.183729","url":null,"abstract":"The development of green, cost-effective thermoelectric (TE) materials is gaining traction in the drive for sustainable energy solutions. This study explores Fe and Co doping effects on the structure, composition, and multifunctional properties of the Zr_1.05NiSb (ZNS) system, providing a rudimentary roadmap for its optimization in future TE and spintronic applications. ZNS, Zr_1.05Ni_0.97Co_0.03Sb (CoZNS), and Zr_1.05Ni_0.97Fe_0.03Sb (FeZNS) samples were synthesized via arc melting, cold pressing, annealing, and hot pressing, followed by comprehensive microstructural and property characterization. ZNS was confirmed to crystallize in an orthorhombic phase with a weak but notable sintering-direction-induced texture, producing anisotropic TE behavior favoring the in-plane direction. Although Co showed poorer solubility at the Ni site than Fe, it proved more effective in enhancing the <em>PF</em> and suppressing thermal conductivity, leading to a 65% increase in <em>z</em>T for CoZNS relative to ZNS at 973<!-- --> <!-- -->K. While the <em>z</em>T values remain modest, the observed potential for further improvement via forced texturing and stabilization of the zinc blende-like structure phase offers optimism for future enhancement. Additionally, magnetic measurements revealed soft ferromagnetism in ZNS, positioning it as a potential ferromagnetic semiconductor for spintronic applications. Finally, Vickers hardness measurements confirmed the superior mechanical robustness of ZNS compared to other TE material classes. Overall, this study highlights the promising multifunctional potential of the ZNS system and establishes a framework for future optimization efforts targeting both TE and spintronic functionalities.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"50 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145043192","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":"Two-dimensional transition metal-based high-entropy oxide nanoplates for enhanced hydrogen storage of LiBH4","authors":"Yuchen Pang, Xuechun Hu, Xiaoyue Zhang, Xuebin Yu, Guanglin Xia","doi":"10.1016/j.jallcom.2025.183613","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.183613","url":null,"abstract":"LiBH₄, with its ultrahigh hydrogen capacity of 18.5<!-- --> <!-- -->wt.%, is regarded as a promising solid-state hydrogen storage material; however, its high thermodynamic stability and sluggish kinetics severely hinder practical application. In this study, two-dimensional Co-based high-entropy metal oxide nanoplates, (CoNiMnFeCr)₃O₄ (HEO), were synthesized as catalysts to enhance the hydrogen storage performance of LiBH₄. Benefiting from the unique multicomponent synergy and abundant oxygen vacancies generated by lattice distortions, HEO significantly lowers the dehydrogenation temperature of LiBH₄. Specifically, in the case of LiBH₄ catalyzed by 30<!-- --> <!-- -->wt.% HEO, the onset and peak hydrogen release temperatures decrease to 100.0 °C and 364.8 °C, respectively—reductions of 175 °C and 130 °C compared with pristine LiBH₄. The decomposition fractions of LiBH₄ at 250 °C and 400 °C increase from 2% and 16% (without catalyst) to 29% and 61%, respectively. Moreover, the catalytic effect of HEO surpasses that of mixed metal oxides and single-component Co-based oxides in reducing the dehydrogenation temperature of LiBH₄. The dehydrogenation activation energy of LiBH₄ is reduced by 37.37<!-- --> <!-- -->kJ<!-- --> <!-- -->mol^-1 H₂, enabling complete hydrogen desorption within 1<!-- --> <!-- -->h at 380 °C, demonstrating excellent dehydrogenation kinetics. During the first two cycles, <u>Co</u>B-like high-entropy borides are formed <em>in-situ</em> on the surface of HEO through reaction with LiBH₄, which effectively prevents further hydrogen capacity loss and catalyzes subsequent H₂ absorption/desorption cycles. After 10 cycles, the reversible H₂ capacity of LiBH₄ under the catalysis of HEO stabilizes at 6.38<!-- --> <!-- -->wt.%, corresponding to a capacity retention of 66.7%.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"53 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145025237","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":"Enhancing thermal stability and reducing resistance drift in Sb Phase-Change Materials via MoS2 alloying","authors":"Mengli Chen, Guoxiang Wang, Anyi He, Yingqi Chen, Tong Wu, Taolu Sun, Zilin Yang","doi":"10.1016/j.jallcom.2025.183693","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.183693","url":null,"abstract":"MoS₂-alloyed antimony (Sb) phase-change thin films were synthesized via magnetron sputtering, and their properties were characterized. Compared to pure Sb films, the alloyed films exhibit a significantly elevated crystallization temperature, thus effectively mitigating the spontaneous crystallization issue inherent to Sb. Notably, the Sb₇₉(MoS₂)₂₁ composition demonstrates outstanding comprehensive performance: a high crystallization temperature of 232 °C, an ultra-low resistance drift coefficient of 0.0004, and 10-year data retention capability at 148.6 °C. These thermal parameters indicate that the formation of high-binding-energy Sb-S and Sb Mo bonds substantially enhances the thermal stability of the MoS₂-alloyed Sb films. Consequently, the improved thermal stability effectively reduces the resistance drift coefficient. Crystallization kinetics analysis reveals that the Avrami exponent (n) is consistently below 1.5, signifying a one-dimensional growth mode during crystallization. This growth mechanism facilitates reduced nucleation randomness and diminished resistance drift. Microstructural analysis further indicates that the incorporation of MoS₂ forms an Sb-Mo-S amorphous phase, which encapsulates Sb grains and fragments large grains into smaller domains. This microstructure effectively suppresses further grain growth and elemental segregation, thereby enhancing the long-term stability of the phase-change films.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"71 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145025240","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":"Density Functional Theory Facilitates Heterovalent Substitution: The Multi-Functional Application of Near-Infrared Emitting Phosphors with Excellent Thermal Stability","authors":"Baofeng Zheng, Jiahao Yan, Xinyu Zhou, Zhe Wang, Yanan Lu, Meiheng Lv, Wenze Li","doi":"10.1016/j.jallcom.2025.183661","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.183661","url":null,"abstract":"Because of the distinct electronic structure and modifiable luminescence properties, the trivalent chromium ion (Cr³⁺) has emerged as the main subject of near-infrared phosphor research. In this study, the Sr₈ZnSc(PO₄)₇:Cr³⁺ near-infrared emitting phosphor was successfully synthesized via the high-temperature solid-phase method. Its crystal structure, luminescence properties, thermal stability, low-temperature sensing and potential application in light-emitting diodes (LEDs) were investigated in detail. Density functional theory proves that Cr has a heterovalent substitution for Sr. The abundant Sr sites enable the spectrum to have a wide emission range. Its central peak position is at 914<!-- --> <!-- -->nm, and the coverage range is 700 <strong>–</strong> 1400<!-- --> <!-- -->nm. At 373 and 423<!-- --> <!-- -->K, the luminescence intensity retains 90.61% and 76.88% of ambient temperature, respectively, demonstrating its ideal thermal stability. Additionally, a dual-mode measurement method was adopted to study its temperature sensitivity at low temperatures. The results show that Sr₈ZnSc(PO₄)₇:Cr³⁺ has excellent sensitivity at low temperature. Lastly, a near-infrared pc-LED device was successfully fabricated and its related applications in the fields of night vision and perspective were demonstrated. This work provides new ideas for the preparation of near-infrared phosphors by the heterometric substitution strategy. And the prepared phosphors have potential applications in low temperature sensing and pc-LED.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"44 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145025315","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":"Enhancing the microstructure and mechanical properties of ultrafine-grained WC-10FeNiCo cemented carbide by optimizing CeO2 addition content","authors":"Yong-Qiang Qin, Liang-Zhi He, Bing Ma, Tian-xu Qiu, Lai-Ma Luo, Yu-Cheng Wu","doi":"10.1016/j.jallcom.2025.183668","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.183668","url":null,"abstract":"In this study, a WC-10FeNiCo-CeO₂ ultrafine cemented carbide was developed via spark plasma sintering (SPS) technology, using FeNiCo medium-entropy alloy (MEA) as the binder phase and CeO₂ as the grain growth inhibitor. The effect of cerium oxide content on regulating the microstructure and mechanical properties was systematically investigated, and the underlying mechanism was clarified.It was found that CeO₂ nanoparticles are uniformly distributed at the WC grain boundaries. They hinder grain boundary migration through physical pinning and further inhibit grain growth by generating internal stress due to lattice mismatch with WC. The FeNiCo medium-entropy alloy (MEA) can form a favorable interface with WC: it reduces stress concentration by enhancing interfacial bonding strength and improves fracture toughness by virtue of its multi-slip system characteristics.Under the sintering condition of 1300℃, the addition of 1.2<!-- --> <!-- -->wt.% cerium oxide refined the WC grains to 312<!-- --> <!-- -->nm, achieving a relative density of 99.24%. Furthermore, the alloy exhibited enhanced Vickers hardness (1965.3 HV30) and fracture toughness (13.25<!-- --> <!-- -->MPa·mm^1/2), while the friction coefficient was reduced to 0.306. This research provides theoretical support and technical reference for the preparation of high-performance low-cobalt ultrafine cemented carbides.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"138 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145026049","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}