Journal of Alloys and Compounds最新文献

{"title":"Role of La/Pr substitution in modulating the Dielectric and Ferroelectric response of SrBi6Nb2Ti3O21 Aurivillius ceramics","authors":"Astha Sharma, Prasanjit K. Dey, Oroosa Subohi","doi":"10.1016/j.jallcom.2025.184202","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.184202","url":null,"abstract":"This paper reports a comprehensive study of two series of <em>La-</em> and <em>Pr-</em>substituted <em>SrBi₆Nb₂Ti₃O₂₁ (SBNT)</em> ceramics with <em>La/Pr</em>=0.04, 0.06, and 0.08, synthesized via the solid-state reaction route. Phase purity and lattice parameter variations were confirmed through XRD and Rietveld refinement. SEM analysis revealed plate-like grain morphology, while XPS results showed the presence of <em>Pr</em>^<em>3+</em>, <em>Pr</em>^<em>4+</em> species in <em>Pr-</em> and a reduction in oxygen vacancies with <em>La/Pr</em> addition. Dielectric properties were studied over a temperature range of RT-750 °C and a frequency range of 20 Hz–1<!-- --> <!-- -->MHz. An increase in ferroelectric transition temperature from ~667 °C to ~700 °C was observed with La/Pr substitutions. The dielectric responses elucidate an increase in RT dielectric constant by a factor of 11-13 relative to pristine <em>SBNT</em> ceramics in La, x=0.06 <em>(SLBNT-6)</em> and Pr, x=0.08 <em>(SPBNT-8)</em> compositions, respectively. Room-temperature P-E loop measurements showed enhanced remanent polarization (2P_r) in all doped samples compared to the pristine composition. Among these, the La=0.06 <em>(SLBNT-6)</em> and Pr=0.08 <em>(SPBNT-8)</em> compositions demonstrated enhanced ferroelectric polarization, with remanent polarization (2Pr) values of 1.15 μC/cm² and 1.72 μC/cm², respectively. These values represent a threefold and fourfold increase in 2P_r values compared to the pristine <em>SBNT</em> compound. These optimized samples also demonstrated energy storage capability and efficiency, as assessed via RT P-E loop measurements. The maximum energy densities recovered were determined to be 77.97<!-- --> <!-- -->kJ/m³ and 67.08<!-- --> <!-- -->kJ/m³ for <em>SLBNT-6</em> and <em>SPBNT-8</em> compositions of <em>La</em>^<em>3+</em> and <em>Pr</em>^<em>3+</em>-modified ceramics, respectively.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"111 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145216168","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":"Precipitation Behavior and Mechanical Properties of an Al-5Cu-1.6Mg-0.4Li-0.59Sc Alloy under Thermomechanical Treatment","authors":"Yong Wang, Tiewu Wang, Yuewen Sun, Guoqing Li, Fei Liu, Xueping Zhao, Pucun Bai, Xiaoming Cui","doi":"10.1016/j.jallcom.2025.184189","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.184189","url":null,"abstract":"This study focuses on the thermomechanically treated Al-5Cu-1.6Mg-0.4Li-0.59Sc alloy. Using characterization techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM), the evolution of precipitation phases in the experimental alloy was systematically investigated, and its mechanical properties were tested.The results show that in the as-rolled state, the secondary phases mainly consist of multiscale precipitates including primaryAl₃Sc、AlCuSc、Al₂Cu and Al₂CuMg. After T6 heat treatment (400℃/12<!-- --> <!-- -->h+490℃/2<!-- --> <!-- -->h+535℃/1<!-- --> <!-- -->h+170℃/24<!-- --> <!-- -->h), the alloy exhibited a large amount of finely dispersed precipitates, such as strip-shaped and step-shaped S (Al₂CuMg) phases, spherical Al₃Sc phases, core-shell structured precipitates with a two-layer structure of (Al,Sc,Cu)/(Al₃Sc) and a three-layer structure of (Al₃Sc, Sc-riched Al₂Cu)/(Al₂CuMg). These core-shell precipitates are fully coherent with the matrix.Mechanical testing shows that the T6-treated alloy achieves a yield strength of 266<!-- --> <!-- -->MPa and an ultimate tensile strength of 320<!-- --> <!-- -->MPa, increased by 11.3% and 24.0% compared to the as-rolled condition. This research provides a theoretical basis for the development of high-performance Al-Cu-Mg alloys.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"121 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145216022","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":"Ultrahigh cyclic stability and large elastocaloric effect in Ge doped Co-V-Ga shape memory alloys","authors":"Xingfa Zhu, Haicheng Xuan, Tao Wang, Jiawei Shi, Junwei Qiao, Long Cheng","doi":"10.1016/j.jallcom.2025.184198","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.184198","url":null,"abstract":"Following significant developments in solid-state cooling, elastothermic refrigeration has received wide attention, while further requiring better elastocaloric effect and more excellent mechanical cycle performance. In this study, we report that by doping Ge into Co-V-Ga-based Heusler alloys and controlling Ge content, the martensitic transformation temperature was adjusted to near room temperature, while reducing the critical stress required for martensitic transformation. The Co₅₀V₃₅Ga₁₄Ge₁ alloy exhibits a large adiabatic temperature change of 10.4<!-- --> <!-- -->K at 500<!-- --> <!-- -->MPa while possessing a compressive strength of 1,989<!-- --> <!-- -->MPa. It also offers exceptional superelasticity with a fully recoverable strain of 4.8%, a low driving force of 167.5<!-- --> <!-- -->MPa and narrow stress hysteresis of 43<!-- --> <!-- -->MPa. At the same time, the temperature change is stabilized at 8.8<!-- --> <!-- -->K after 10,000 cycles under 500<!-- --> <!-- -->MPa in a cycling test, showing almost no degradation.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"105 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145216024","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":"Thermomechanical Powder Processing of Ti-6Al-2Sn-4Zr-2Mo-0.1Si: Influence of Powder Morphology, Oxygen Content, and Elemental Partitioning on Microstructure and Mechanical Performance","authors":"Yaqi Chang, Rob Torrens, Giribaskar Sivaswamy, Arivarasu Moganraj, Qiang Zhu, Bhagyaraj Jayabalan, Ajit Pal Singh","doi":"10.1016/j.jallcom.2025.184200","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.184200","url":null,"abstract":"This study investigates the thermomechanical powder metallurgy processing of Ti-6Al-2Sn-4Zr-2Mo-0.1Si (Ti-6242S) using two commercially available titanium powders: spherical powder produced by the plasma rotating electrode process (PREP) and irregular powder from the hydride–dehydride (HDH) method. Elemental powder blends were pre-consolidated under inert conditions and subsequently extruded in air to evaluate the feasibility of secondary processing without protective gas atmospheres. The powders differed in morphology, and the extruded alloys exhibited distinct oxygen contents (~0.21<!-- --> <!-- -->wt.% for PREP-derived and ~0.52<!-- --> <!-- -->wt.% for HDH-derived materials), enabling a controlled investigation of microstructure–property relationships under α+β (925 °C) and β-phase (1080 °C) extrusion regimes. HDH-derived alloys developed fine, uniform lamellar α/β microstructures with increased β-phase volume fractions, while PREP-based materials exhibited coarser α colonies and molybdenum-rich segregation. Mechanical testing showed that HDH alloys achieved higher strength (up to 1232<!-- --> <!-- -->MPa) but reduced ductility (~4.8%) due to oxygen-induced embrittlement. In contrast, PREP alloys showed a better strength–ductility balance (1057<!-- --> <!-- -->MPa, 7.6%) with finer lamellae and reduced β grain coarsening at elevated extrusion temperatures. Energy-dispersive X-ray spectroscopy and transmission electron microscopy confirmed phase-specific partitioning: aluminium and titanium enriched the α phase, while molybdenum stabilised the β phase and promoted α₂-Ti₃Al precipitation. Fracture analysis revealed a transition from ductile rupture in PREP alloys to brittle cleavage in HDH alloys. These findings demonstrate that air-based extrusion, when combined with suitable powder selection and thermal control, offers a practical and scalable route for producing high-performance near-α titanium alloys, potentially enabling more sustainable and cost-efficient component manufacturing in aerospace and related sectors.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"28 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145216025","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":"Heterogeneous Layer Configuration Engineering for Enhanced Piezoelectric Performance of Bi(Fe0.95Mn0.03Ti0.02)O3/Bi0.5Na0.5TiO3-0.06BaTiO3 Composite Thin Films","authors":"Kun Zhu, Ruijie Li, Yaqi Zhang, Dong Shen, Yanjie Wang, Zhiqiang Lan, Jie Wang, Tao Chen, Jian He, Xiujian Chou, Jiwei Zhai","doi":"10.1016/j.jallcom.2025.184194","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.184194","url":null,"abstract":"With the rapid development of smart electronics and micro-electro-mechanical systems (MEMS), lead-free piezoelectric thin films with both high piezoelectric activity and environmental stability have emerged as core materials, directly determining the performance upper limits of next-generation miniaturized devices. Heterostructured Bi(Fe_0.95Mn_0.03Ti_0.02)O₃/Bi_0.5Na_0.5TiO₃-0.06BaTiO₃ (denoted as B and A) multilayer thin films with distinct stacking sequences (BAA, ABA, AAB) were fabricated. The BAA structure exhibits superior performance, showing a high piezoelectric coefficient (d₃₃^⁎) of 98.1<!-- --> <!-- -->pm/V—approximately 4.2 times that of the pure A thin film—along with a maximum polarization of 56.2 μC/cm² and a dielectric constant of 480 at 1<!-- --> <!-- -->kHz. Moreover, the leakage current density is reduced by two orders of magnitude, and robust thermal stability of polarization is maintained over the temperature range of 25 - 200 °C. This work clarifies the mechanism by which heterolayer structure enhances piezoelectric properties, provides a strategy for developing high-performance lead-free piezoelectric thin films, and promotes their application in microelectronic devices, thereby driving technological and industrial progress in the field.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"105 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145216169","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":"Data-driven accelerated design of non-equimolar rare-earth silicates with phase stability and high CMAS resistance at 1550 °C","authors":"Bin Qian, Wei Liang, Yumin Tu, Jiahao Zu, Keyuan Xu, Xinchen Ding, Yu Wang, Fangli Yu, Yu Bai","doi":"10.1016/j.jallcom.2025.184100","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.184100","url":null,"abstract":"The vast compositional space of non-equimolar systems requires data-driven methods to predict phase stability and CMAS resistance of rare-earth silicates (RESs). A dataset of phase structure and CMAS resistance was established by combining RESs synthesized in this work via sol–gel methods with open data. Rietveld-refined XRD data revealed linear correlations among &lt;span&gt;&lt;span&gt;&lt;math&gt;&lt;msub is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;mi is=\"true\"&gt;I&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow is=\"true\"&gt;&lt;mo is=\"true\"&gt;max&lt;/mo&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt;&lt;script type=\"math/mml\"&gt;&lt;math&gt;&lt;msub is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;mi is=\"true\"&gt;I&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow is=\"true\"&gt;&lt;mo is=\"true\"&gt;max&lt;/mo&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/script&gt;&lt;/span&gt;, lattice constants, distortion, and &lt;span&gt;&lt;span&gt;&lt;math&gt;&lt;msub is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;mover accent=\"true\" is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;mi is=\"true\"&gt;r&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow is=\"true\"&gt;&lt;mo is=\"true\"&gt;̄&lt;/mo&gt;&lt;/mrow&gt;&lt;/mover&gt;&lt;/mrow&gt;&lt;mrow is=\"true\"&gt;&lt;mi is=\"true\"&gt;M&lt;/mi&gt;&lt;mi is=\"true\"&gt;e&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt;&lt;script type=\"math/mml\"&gt;&lt;math&gt;&lt;msub is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;mover accent=\"true\" is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;mi is=\"true\"&gt;r&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow is=\"true\"&gt;&lt;mo is=\"true\"&gt;̄&lt;/mo&gt;&lt;/mrow&gt;&lt;/mover&gt;&lt;/mrow&gt;&lt;mrow is=\"true\"&gt;&lt;mi is=\"true\"&gt;M&lt;/mi&gt;&lt;mi is=\"true\"&gt;e&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/script&gt;&lt;/span&gt;. A total of 37 potential descriptors were screened using machine learning. A voting ensemble classifier identified rare-earth disilicates compositions forming a stable &lt;span&gt;&lt;span&gt;&lt;math&gt;&lt;mi is=\"true\"&gt;β&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt;&lt;script type=\"math/mml\"&gt;&lt;math&gt;&lt;mi is=\"true\"&gt;β&lt;/mi&gt;&lt;/math&gt;&lt;/script&gt;&lt;/span&gt;-phase, without enforcing a strict distinction between multi- and &lt;span&gt;&lt;span&gt;&lt;math&gt;&lt;mi is=\"true\"&gt;γ&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt;&lt;script type=\"math/mml\"&gt;&lt;math&gt;&lt;mi is=\"true\"&gt;γ&lt;/mi&gt;&lt;/math&gt;&lt;/script&gt;&lt;/span&gt;-phase, due to varying testing temperatures across research groups. A corrosion grading function (CRG) was introduced to mathematically classify the CMAS resistance levels of RESs, reducing the dimensionality of experimental datasets. The XGBoost model was used to predict about 3.5 million non-equimolar compositions by systematic enumeration five elements from a cost-effective RE pool (Yb, Tm, Er, Y, Ho, Tb, Gd), identifying optimized formulations. Experimental validation at 1550 &lt;span&gt;&lt;span&gt;&lt;math&gt;&lt;mrow is=\"true\"&gt;&lt;mo is=\"true\"&gt;°&lt;/mo&gt;&lt;mi is=\"true\" mathvariant=\"normal\"&gt;C&lt;/mi&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;&lt;script type=\"math/mml\"&gt;&lt;math&gt;&lt;mrow is=\"true\"&gt;&lt;mo is=\"true\"&gt;°&lt;/mo&gt;&lt;mi mathvariant=\"normal\" is=\"true\"&gt;C&lt;/mi&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/script&gt;&lt;/span&gt; for 24 h on the composition &lt;span&gt;&lt;span&gt;&lt;math&gt;&lt;mrow is=\"true\"&gt;&lt;msub is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;mo is=\"true\"&gt;(&lt;/mo&gt;&lt;msub is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;mi is=\"true\" mathvariant=\"normal\"&gt;Gd&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;0&lt;/mn&gt;&lt;mo is=\"true\"&gt;.&lt;/mo&gt;&lt;mn is=\"true\"&gt;05&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;msub is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;mi is=\"true\" mathvariant=\"normal\"&gt;Er&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;0&lt;/mn&gt;&lt;mo is=\"true\"&gt;.&lt;/mo&gt;&lt;mn is=\"true\"&gt;1&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;msub is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;mi is=","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"75 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145209479","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":"SiGe/Ge Core-Multishell Nanocrystals Grown by Solid-State Dewetting and Ge Thermal Condensation for Photodetection and Solar cell Applications","authors":"A.K. Aladim, Mansour Aouassa, Mohammed Bouabdellaoui, Walter B. Pessoa, Saud A. Algarni, S. Amdouni, Mohammed Ibrahim, K.M.A. Saron, Isabelle Berbezier","doi":"10.1016/j.jallcom.2025.184169","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.184169","url":null,"abstract":"This study introduces a novel method for synthesizing SiGe/Ge core-multishell nanocrystals on insulating thin films for optoelectronic applications. The approach combines solid-state dewetting under ultra-high vacuum with Ge thermal condensation in SiGe layers, producing hemispherical nanocrystals with narrow size dispersion and well-defined crystallographic facets. Structural and spectroscopic analyses confirm high purity, uniform Ge composition, and complex core-shell architecture. Electrical characterizations validate successful integration into MIS structures, while photocurrent response under visible light highlights their potential for next-generation optoelectronic devices. This work offers a pathway for designing advanced functional nanostructures.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"4 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145209480","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":"Hot corrosion of high-entropy alloys induced by KCl-55%ZnCl2 molten salt films in air","authors":"Hailiang Zhang, Jiangtao Wu, Qian Wang, Chaoliu Zeng","doi":"10.1016/j.jallcom.2025.184181","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.184181","url":null,"abstract":"This study investigates the effects of reactive elements Cr, Al and Si on the corrosion behavior of high-entropy alloys (HEAs) under KCl-55 at.% ZnCl₂ salt films at 450 °C. The mass loss of the Fe_18.9Co_19.2Ni_18.9Cr_18.9Al_19.3Si_4.8 high-entropy alloy after 80<!-- --> <!-- -->hours of corrosion was only 46.56<!-- --> <!-- -->mg/cm², which is 81.68%, 81.39%, and 72.49% lower than that of Fe_24.9Co_25.4Ni_25.1Cr_24.6, Fe_24.9Co_25.2Ni_25.5Al_24.3, and Fe_21.0Co_20.3Ni_18.6Cr_21.9Al_18.2, respectively. This result clearly demonstrates the significantly superior corrosion resistance of the FeCoNiCrAlSi high-entropy alloy. In the KCl-55 at.% ZnCl₂ environment, HEAs develop preferential dissolution zones and even depletion zones of Cr and Al, which provide diffusion pathways for corrosive media into the alloy matrix, accelerating degradation. Notably, the addition of 4.8<!-- --> <!-- -->at.% Si promotes the formation of a continuous composite oxide film composed of Cr, Al, Ni, Si, and other elements on the surface of the Fe_18.9Co_19.2Ni_18.9Cr_18.9Al_19.3Si_4.8 high-entropy alloy, effectively isolating the alloy from corrosive species and reducing corrosion rates. Nevertheless, intergranular corrosion was observed within the substrate of the FeCoNiCrAlSi high-entropy alloy, indicating that structural weaknesses at the grain boundaries may still pose a risk of failure during long-term service.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"39 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145209534","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":"Rare Earth Doped Lithium Tetraborate for Optically/Thermally Stimulated Luminescence Dosimetry","authors":"Yuetong Ma, Menglin Qiu, Xiao Ouyang, Zhe Xie, Shengjie Du, Guojing Wang, Dongyue Chen, Zhengcao Li, Shasha Lv","doi":"10.1016/j.jallcom.2025.184176","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.184176","url":null,"abstract":"Radiometry materials tested from optically stimulated luminescence (OSL) and thermally stimulated luminescence (TL) are widely used in environmental radiation monitoring, nuclear medicine and space exploration. Li₂B₄O₇ (LTB, Lithium tetraborate) with similar equivalent atomic number to that of human tissue, which can improve the absorbed dose accuracy and broaden the radiation dosimetry range with rare earth elements regulation. LTB ceramic compacts by different Er ions doping were prepared by the hydrothermal method, then their morphological features, crystal structures, and compositional components were systematically characterized. The characteristic luminescence spectra and concentration quenching effects at different doping levels were investigated using UV-vis absorption and photoluminescence (PL) spectroscopy, complemented by analysis of elemental oxidation states, binding energies, and impurity-induced energy levels. It was found that the LTBE: Er(0.5<!-- --> <!-- -->mol.%) sample exhibited the highest luminescence intensity. However, as the doping concentration decreased, the luminescence lifetime shortened from 6.13 ms to 3.98 ms. For OSL/TL performance evaluation, their repeatability and reproducibility were investigated, and the precise deconvolution of the luminescence curves enables rigorous quantification of trap parameters with activation energy and frequency factor through kinetic analysis. The correlation between time-dependent luminescence decay behavior and trap distribution is revealed, and we elucidate how competing electron retrapping processes and radiation-induced defect configurations collectively govern the photo-stimulated charge transfer dynamics. The optimized sample demonstrated excellent OSL dose–response characteristics, showing good linearity over a range of 0.05–250<!-- --> <!-- -->Gy. The precise doping of rare earth elements provides atomic-level modulation for optimizing the OSL/TL performance of LTBE as radiation dosimetry.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"102 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145209377","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":"Doping-Induced Structural and Electrical Modifications in SbSI Nanowires Embedded in Graphene Oxide for Enhanced Optoelectronic Applications","authors":"Muhammad Danish Ali, Marcin Jesionek, Anna Starczewska, Talat Zeeshan, Maciej Zubko","doi":"10.1016/j.jallcom.2025.184183","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.184183","url":null,"abstract":"The growing demand for high-performance materials in electronics and optoelectronics has intensified the focus on one-dimensional (1D) nanostructures and their composites. This work introduces a novel, in-situ method for doping antimony sulfoiodide nanowires (SbSI NWs) onto graphene oxide (GO) nanosheets, a composite approach unexplored in prior literature An innovative in-situ method was developed to fabricate these GO-SbSI composites. Comprehensive characterization via XRD and FTIR confirmed the successful formation of SbSI NWs (JCPDS no. 88-0988) and their integration with GO, evidenced by the disappearance of specific FTIR peaks (e.g., ~2900<!-- --> <!-- -->cm⁻¹) in the composites. SEM analysis revealed a reduction in SbSI NW size to approximately 3<!-- --> <!-- -->µm post-compositing. The electrical and dielectric properties were profoundly enhanced by the doping process. The AC conductivity of the optimal composite (H3) reached 0.017<!-- --> <!-- -->S/m, significantly surpassing that of pure GO (0.052<!-- --> <!-- -->S/m) and pristine SbSI (2.17×10⁻⁴ S/m). The complex dielectric behavior was analyzed, with high low-frequency permittivity attributed to various polarization mechanisms. Most notably, the composites exhibited exceptional electromagnetic interference (EMI) shielding performance. The shielding effectiveness (SER) was dramatically enhanced from -20 dB for pure GO to an outstanding -56 dB for the H3 composite, indicating a transition from a weak shielding material to a powerful attenuator of electromagnetic radiation. These results unequivocally demonstrate that the strategic doping of GO with SbSI NWs creates a superior functional material with high potential for application in advanced EMI shielding and nano-electronic devices.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"78 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145209481","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}