Pub Date : 2026-02-06DOI: 10.1016/j.jallcom.2026.186661
Nayely Pineda Romero, Joanna Grelska, Wojciech A. Sławiński, Jakub Cizek, Oksana Melikhova, Claudia Zlotea
Multi-principal element alloys have emerged as promising candidates for solid-state hydrogen storage but, their absorption/desorption cyclability remains poorly understood. In this study, the cycling behavior of four compositions in the bcc TiVNb related alloy family (ternary TiVNb, quaternary Al0.05(TiVNb)0.95, and two quinary Al0.05(TiVNb)0.95−xMox (x = 0.05, 0.10) variants) is highlighted to emphasize the effect of chemistry on the capacity degradation mechanisms. The best alloys showing a very fast stabilization of their performance and a minimum loss of capacity during cycling are the quinary ones, while TiVNb is the poorest one. Repeated cycling does not induce metal chemical species migration, phase segregation, or changes in average and local structures, as demonstrated by SEM-EDS, synchrotron-based total scattering, and related pair distribution function analysis coupled with reverse Monte Carlo modeling. Metal atoms are randomly distributed in the bcc lattice of these alloys, which enhances structural integrity during cycling. The only significant change that could explain the different cycling properties is related to defects’ evolution. Positron annihilation spectroscopy revealed the formation of both dislocations and vacancies during cycling, irrespective of the composition. However, the dynamics of defects strongly depends on the chemical composition: dislocations and vacancies are larger in volume in the ternary alloy than in the quinary variants, which suggests a lower defect mobility in the presence of Al and Mo. These results demonstrate that tailoring and controlling defect dynamics is paramount in enhancing the cycle-life properties of the multi-principal element alloys.
{"title":"Low mobility of crystalline defects improves the cycle life stability of Alx(TiVNb)1-x-yMoy alloys for hydrogen storage","authors":"Nayely Pineda Romero, Joanna Grelska, Wojciech A. Sławiński, Jakub Cizek, Oksana Melikhova, Claudia Zlotea","doi":"10.1016/j.jallcom.2026.186661","DOIUrl":"https://doi.org/10.1016/j.jallcom.2026.186661","url":null,"abstract":"Multi-principal element alloys have emerged as promising candidates for solid-state hydrogen storage but, their absorption/desorption cyclability remains poorly understood. In this study, the cycling behavior of four compositions in the <em>bcc</em> TiVNb related alloy family (ternary TiVNb, quaternary Al<sub>0.05</sub>(TiVNb)<sub>0.95</sub>, and two quinary Al<sub>0.05</sub>(TiVNb)<sub>0.95−<em>x</em></sub>Mo<sub><em>x</em></sub> (<em>x</em> = 0.05, 0.10) variants) is highlighted to emphasize the effect of chemistry on the capacity degradation mechanisms. The best alloys showing a very fast stabilization of their performance and a minimum loss of capacity during cycling are the quinary ones, while TiVNb is the poorest one. Repeated cycling does not induce metal chemical species migration, phase segregation, or changes in average and local structures, as demonstrated by SEM-EDS, synchrotron-based total scattering, and related pair distribution function analysis coupled with reverse Monte Carlo modeling. Metal atoms are randomly distributed in the <em>bcc</em> lattice of these alloys, which enhances structural integrity during cycling. The only significant change that could explain the different cycling properties is related to defects’ evolution. Positron annihilation spectroscopy revealed the formation of both dislocations and vacancies during cycling, irrespective of the composition. However, the dynamics of defects strongly depends on the chemical composition: dislocations and vacancies are larger in volume in the ternary alloy than in the quinary variants, which suggests a lower defect mobility in the presence of Al and Mo. These results demonstrate that tailoring and controlling defect dynamics is paramount in enhancing the cycle-life properties of the multi-principal element alloys.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"301 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2026-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146122161","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}
Pub Date : 2026-02-06DOI: 10.1016/j.jallcom.2026.186670
B. Prathyusha, R. Kumar, S.K. Panigrahi
{"title":"Hybrid thermomechanical approach for developing triple synergy of strength, ductility and bond integrity in Al/Cu bimetallic sheets","authors":"B. Prathyusha, R. Kumar, S.K. Panigrahi","doi":"10.1016/j.jallcom.2026.186670","DOIUrl":"https://doi.org/10.1016/j.jallcom.2026.186670","url":null,"abstract":"","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"30 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2026-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146134272","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}
Pub Date : 2026-02-06DOI: 10.1016/j.jallcom.2026.186666
Jae Won Choi, Seong-Joon Won, Jung-Min Cho, Yun-Ho Kim, Gangmin Park, Dong-Hoon Jang, No-Won Park, Gil-Sung Kim, Sangjun Jeon, Sang-Kwon Lee
{"title":"Temperature-dependent Spin Thermopowers in Pt/Ni80Fe20/Al2O3 Heterostructures via the Longitudinal Spin Seebeck Effect","authors":"Jae Won Choi, Seong-Joon Won, Jung-Min Cho, Yun-Ho Kim, Gangmin Park, Dong-Hoon Jang, No-Won Park, Gil-Sung Kim, Sangjun Jeon, Sang-Kwon Lee","doi":"10.1016/j.jallcom.2026.186666","DOIUrl":"https://doi.org/10.1016/j.jallcom.2026.186666","url":null,"abstract":"","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"1 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2026-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146134273","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}
Pub Date : 2026-02-06DOI: 10.1016/j.jallcom.2026.186659
Sunil Shrestha, McKinley A. Prager, Kazuumi Fujioka, Rui Sun, Craig M. Jensen
{"title":"Kinetic and Modeling Studies of the Mechanism of the Dehydrogenation of Mg(BH4)2 to Mg(B3H8)2","authors":"Sunil Shrestha, McKinley A. Prager, Kazuumi Fujioka, Rui Sun, Craig M. Jensen","doi":"10.1016/j.jallcom.2026.186659","DOIUrl":"https://doi.org/10.1016/j.jallcom.2026.186659","url":null,"abstract":"","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"307 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2026-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146134261","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":"Elastic accommodation and anomalous tetragonality of thin-plate martensite in an Fe-31Ni-10Co-3Ti alloy revealed by in situ neutron diffraction at cryogenic temperatures","authors":"Takayuki Yamashita, Stefanus Harjo, Wu Gong, Takuro Kawasaki, Shigekazu Morito, Satoshi Morooka, Hidetoshi Fujii, Yo Tomota","doi":"10.1016/j.jallcom.2026.186668","DOIUrl":"https://doi.org/10.1016/j.jallcom.2026.186668","url":null,"abstract":"","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"48 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2026-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146134263","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}
Pub Date : 2026-02-06DOI: 10.1016/j.jallcom.2026.186676
Xiaoyu Tian, Fangfei Lv, Meng Zhang, Wei-Wei Wang, Lili Huo
{"title":"Universal synthesis of mesoporous alumina supported nitride catalysts for hydrogen production from ammonia decomposition","authors":"Xiaoyu Tian, Fangfei Lv, Meng Zhang, Wei-Wei Wang, Lili Huo","doi":"10.1016/j.jallcom.2026.186676","DOIUrl":"https://doi.org/10.1016/j.jallcom.2026.186676","url":null,"abstract":"","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"182 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2026-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146134266","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}
Pub Date : 2026-02-06DOI: 10.1016/j.jallcom.2026.186667
Zhanhua Ye, Chi Zhang, Yang Liu, Xiaoxi Jin, Tianyu Wei, Yaojun Lin, Fei Chen
{"title":"A Multiscale Data-Driven Framework for Mechanical Property Prediction in LPBF-Processed TA15 Alloy: Integrating Explainable Machine Learning with Data Augmentation","authors":"Zhanhua Ye, Chi Zhang, Yang Liu, Xiaoxi Jin, Tianyu Wei, Yaojun Lin, Fei Chen","doi":"10.1016/j.jallcom.2026.186667","DOIUrl":"https://doi.org/10.1016/j.jallcom.2026.186667","url":null,"abstract":"","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"30 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2026-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146134268","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}
Pub Date : 2026-02-06DOI: 10.1016/j.jallcom.2026.186664
Wei Zhang, Huanhuan Li, Ya Yang, Jianxu Hu, Huajie Luo, Jinjun Liu
Electronics and electrical systems operating in high-temperature environments demand advanced dielectric materials for capacitive energy storage. Ceramic dielectrics, while considered ideal for electrostatic capacitors, are often limited by insufficient energy storage performance and inadequate thermal stability under harsh conditions. Herein, a universal strategy is reported to optimize overall capacitive performance through chemically modified induced polar-phase evolution. The introduction of Bi0.5Na0.5TiO3 (BNT) into 0.82NaNbO3-0.18Ca0.7Sm0.2TiO3 (NN‑CST) ceramics induces lattice distortion and promotes the formation of a highly polar rhombohedral phase (R3c), leading to significantly enhanced maximum polarization. Furthermore, the corresponding ceramic exhibits pronounced relaxor behavior, low leakage current density, and a wide bandgap, which synergistically improve the breakdown strength. Consequently, the 0.85(NN‑CST)–0.15BNT ceramic achieves a high recoverable energy storage density (Wrec) of 7.42 J cm-3 with an efficiency (η) of 91% at 660 kV cm-1, along with excellent thermal stability over 20-180 ℃ (Wrec = 3.45 ± 5% J cm-3, η = 94 ± 2%). This work provides a viable approach for designing high-performance lead-free dielectric ceramics for high-temperature capacitive energy storage applications.
{"title":"Enhanced Energy Storage in NaNbO3-based Ceramics via Polar Phase Evolution over a Wide Temperature Range","authors":"Wei Zhang, Huanhuan Li, Ya Yang, Jianxu Hu, Huajie Luo, Jinjun Liu","doi":"10.1016/j.jallcom.2026.186664","DOIUrl":"https://doi.org/10.1016/j.jallcom.2026.186664","url":null,"abstract":"Electronics and electrical systems operating in high-temperature environments demand advanced dielectric materials for capacitive energy storage. Ceramic dielectrics, while considered ideal for electrostatic capacitors, are often limited by insufficient energy storage performance and inadequate thermal stability under harsh conditions. Herein, a universal strategy is reported to optimize overall capacitive performance through chemically modified induced polar-phase evolution. The introduction of Bi<sub>0.5</sub>Na<sub>0.5</sub>TiO<sub>3</sub> (BNT) into 0.82NaNbO<sub>3</sub>-0.18Ca<sub>0.7</sub>Sm<sub>0.2</sub>TiO<sub>3</sub> (NN‑CST) ceramics induces lattice distortion and promotes the formation of a highly polar rhombohedral phase (<em>R3c</em>), leading to significantly enhanced maximum polarization. Furthermore, the corresponding ceramic exhibits pronounced relaxor behavior, low leakage current density, and a wide bandgap, which synergistically improve the breakdown strength. Consequently, the 0.85(NN‑CST)–0.15BNT ceramic achieves a high recoverable energy storage density (<em>W</em><sub>rec</sub>) of 7.42<!-- --> <!-- -->J<!-- --> <!-- -->cm<sup>-3</sup> with an efficiency (<em>η</em>) of 91% at 660<!-- --> <!-- -->kV<!-- --> <!-- -->cm<sup>-1</sup>, along with excellent thermal stability over 20-180 ℃ (<em>W</em><sub>rec</sub> = 3.45 ± 5% J cm<sup>-3</sup>, <em>η</em> = 94 ± 2%). This work provides a viable approach for designing high-performance lead-free dielectric ceramics for high-temperature capacitive energy storage applications.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"17 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2026-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146122159","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}
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