Journal of Alloys and Compounds最新文献

{"title":"The detrimental effect of quenching-induced plastic strain on the creep property of nickel-based superalloy turbine discs","authors":"Jinyan Cui, Zhaofeng Liu, Jian Yao, Xiangdong Ma, Jianzheng Guo, Ganjiang Feng","doi":"10.1016/j.jallcom.2026.187963","DOIUrl":"https://doi.org/10.1016/j.jallcom.2026.187963","url":null,"abstract":"The effect of plastic strain arising from heat treatment on the creep property of FGH96 nickel-based superalloy turbine discs was systematically investigated. By means of numerical simulation and precise cooling control during the heat treatment, samples with different levels of accumulated initial plastic strain were obtained. Creep tests at 704 °C/690<ce:hsp sp=\"0.25\"></ce:hsp>MPa were then carried out. The results indicated that samples with no plastic strain exhibited an average creep time of 158<ce:hsp sp=\"0.25\"></ce:hsp>hours at 0.2% creep strain, whereas the samples with an accumulated initial plastic strain of 0.8% showed a significantly reduced creep time of about 36<ce:hsp sp=\"0.25\"></ce:hsp>hours. After re-heat treatment, the creep time of the latter sample at 0.2% creep strain recovered to 99<ce:hsp sp=\"0.25\"></ce:hsp>hours under the same testing condition. Results showed that specimen-level heat treatments—even with identical thermal cycles—fail to replicate full-scale disc creep behavior due to the absence of quenching-induced plastic strain, overestimating the disc creep life by 77%. The accumulated plastic strain led to a high density of mobile dislocations, which further formed stacking faults and microtwins via dissociation and glide. These defects shortened the time required for dislocation formation and interaction during creep, thereby accelerating the creep process. Re-heat treatment decreased the dislocation density through dislocation annihilation and increased stacking fault energy, thus enhancing creep resistance.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"56 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2026-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147681090","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":"Electrochemical behavior of Ta(V) in KF-KCl-K2TaF7 molten salt and formation of Ta-Al alloys via the liquid Al cathode","authors":"Zhuan Zhao, Dongsheng Jiang, Yi Chen, Yuzhuo Wei, Huan Zhang, Huimin Tang, Jianxun Song, Yusi Che, Jilin He","doi":"10.1016/j.jallcom.2026.187974","DOIUrl":"https://doi.org/10.1016/j.jallcom.2026.187974","url":null,"abstract":"This study aimed to explore the feasibility of forming tantalum-aluminum (Ta-Al) alloys from the KF-KCl-K<ce:inf loc=\"post\">2</ce:inf>TaF<ce:inf loc=\"post\">7</ce:inf>-Ta<ce:inf loc=\"post\">2</ce:inf>O<ce:inf loc=\"post\">5</ce:inf> molten salt system. Departing from conventional solid-state cathodes, this study pioneered the use of liquid aluminum interfaces to precisely regulate the five-electron transfer pathway during the electrochemical reduction of Ta (V), as revealed by square wave voltammetry and cyclic voltammetry. The Ta-Al alloy formed on the liquid Al electrode exhibited a homogeneous single-phase structure identified as the Al<ce:inf loc=\"post\">3</ce:inf>Ta intermetallic phase, with no detectable secondary phases or impurities. The Ta deposition kinetics on molybdenum (Mo) electrodes were diffusion-controlled and governed by a single-step reduction mechanism in the three-electrode system(graphite counter electrode, molybdenum wire working electrode, and platinum wire reference electrode) at −0.96 V vs. Pt, with chronoamperometric analysis yielded an ion diffusion coefficient of <ce:italic>D</ce:italic> = 5.03 × 10<ce:sup loc=\"post\">−7</ce:sup> cm<ce:sup loc=\"post\">2</ce:sup>/s via Cottrell equation fitting. The dissolution of Ta<ce:inf loc=\"post\">2</ce:inf>O<ce:inf loc=\"post\">5</ce:inf> in the KF-KCl-K<ce:inf loc=\"post\">2</ce:inf>TaF<ce:inf loc=\"post\">7</ce:inf> electrolyte during the preparation of Ta powder or alloys did not significantly alter the reduction potential or reduction mechanism. Its primary role was to maintain the concentration of Ta<ce:sup loc=\"post\">5+</ce:sup> species in the melt. Overall, the proposed approach overcame the limitations of conventional alloying methods, enabling the efficient and sustainable development of advanced materials with enhanced performance.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"19 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2026-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147681250","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-cycle fatigue behavior and dislocation-mediated crack initiation mechanisms in Ti-3.5Al-5Mo-4V metastable β titanium alloy","authors":"Jie Lou, Fei Liu, Zhong Zhang, Si-Yuan Wei, Song Xiang","doi":"10.1016/j.jallcom.2026.188014","DOIUrl":"https://doi.org/10.1016/j.jallcom.2026.188014","url":null,"abstract":"Ti-3.5Al-5Mo-4V (Ti-B20) is a typical metastable β titanium alloy with a relatively low molybdenum equivalent, offering high strength and good processability for aerospace and other demanding applications. In this study, the high-cycle fatigue (HCF) behavior of Ti-B20 alloy with three representative microstructures (as-forged (FM), bimodal (BM), and lamellar (LM)) was systematically investigated at room temperature. The results show that the FM condition exhibits the lowest tensile and fatigue strength but the highest ductility, whereas the BM condition demonstrates superior tensile properties and a slightly higher HCF limit than the LM condition. Microstructural characterization using scanning electron microscopy and transmission electron microscopy reveals that fatigue crack initiation is strongly dependent on microstructure. Specifically, in FM, cracks preferentially nucleate within the β residual phase (β<ce:inf loc=\"post\">r</ce:inf>) and at α<ce:inf loc=\"post\">p</ce:inf>/transformed β (β<ce:inf loc=\"post\">trans</ce:inf>) interfaces; in BM, inside α<ce:inf loc=\"post\">p</ce:inf> and at α<ce:inf loc=\"post\">p</ce:inf>/β<ce:inf loc=\"post\">trans</ce:inf> interfaces; and in LM, at α<ce:inf loc=\"post\">s</ce:inf>/β<ce:inf loc=\"post\">r</ce:inf> interfaces and microstructural heterogeneities. Dislocation analysis further indicates that the α<ce:inf loc=\"post\">p</ce:inf> and α<ce:inf loc=\"post\">s</ce:inf> phases accommodate more cyclic deformation than the β<ce:inf loc=\"post\">r</ce:inf>, as evidenced by frequent dislocation tangles, pile-ups, and deformation twins. These findings establish a clear correlation between microstructure and fatigue crack initiation behavior, providing experimental insight into the early-stage fatigue damage mechanisms of Ti-B20 alloy.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"22 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2026-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147681454","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":"Unlocking enhanced methanol oxidation on PtRu nanoalloys via Fe-induced strong d-d orbital coupling","authors":"Jing Chen, Mengjun Xiao, Jiale Wan, Xingqun Zheng, Chuan Li, Can Deng, Pan Zhao, Minghao Ran, Zhanxin Mao, Yao Nie","doi":"10.1016/j.jallcom.2026.188017","DOIUrl":"https://doi.org/10.1016/j.jallcom.2026.188017","url":null,"abstract":"PtRu-based nanoalloys represent promising electrocatalysts for the methanol oxidation reaction (MOR), yet their practical application is hindered by insufficient catalytic activity and the instability of Ru under acidic conditions. Herein, a <ce:italic>d</ce:italic>-orbital structure regulation strategy enabled by Fe doping is proposed to resolve the intrinsic activity-stability trade-off dilemma of PtRu catalysts. The resulting Fe-incorporated PtRu nanoalloys (Fe-PtRu) achieve exceptional MOR activity and durability, surpassing PtRu and Pt benchmarks. Experimental and mechanistic studies demonstrate that Fe doping induces strong <ce:italic>d</ce:italic>-<ce:italic>d</ce:italic> orbital hybridization, enriching the <ce:italic>d</ce:italic>-electron density of both Pt and Ru sites, resulting not only reduced CO*chemisorption strength on Pt sites but also enhanced corrosion resistance against Ru dissolution. This work offers an effective electronic-structure engineering approach to designing highly active and stable PtRu-based nanoalloys with remarkable anodic properties for fuel cells and beyond.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"316 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2026-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147681247","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":"Tuning electrical transport and magnetoresistance through grain size in graphene-nanocrystalline carbon films","authors":"Xingze Dai, Dong Ding, Wenxian Zhang, Chao Wang","doi":"10.1016/j.jallcom.2026.187984","DOIUrl":"https://doi.org/10.1016/j.jallcom.2026.187984","url":null,"abstract":"Grain boundaries play a crucial role in determining the electrical transport and magnetoresistance properties of polycrystalline and nanocrystalline amorphous thin films. In this work, we fabricated a series of carbon films containing graphene nanocrystallites with progressively increasing grain sizes, utilizing an electron-cyclotron-resonance-assisted physical vapor deposition process. Raman spectroscopy and high-resolution scanning transmission electron microscopy (STEM) confirmed that the size of the graphene nanocrystallites increases with the electron irradiation energy applied during growth. Correspondingly, electrical transport measurements demonstrated that films deposited under higher irradiation energy exhibit superior electrical conductivity, which is primarily attributed to the increased content and size of the conductive graphene nanocrystallites. Resistivity-temperature curves revealed that charge transport in these films is governed by a combination of Mott variable-range hopping (VRH) and grain boundary scattering (GBS). Furthermore, the magnetoresistance (MR) of the films exhibits a temperature-dependent sign reversal, transitioning from positive to negative as the temperature increases from 6 to 150 K. This behavior is attributed to a crossover between two competing mechanisms: the wave-function shrinkage effect (WFS), which dominates positive MR at low temperatures, and grain boundary scattering, which governs the negative MR at higher temperatures. This study establishes a clear correlation between the evolution of graphene nanocrystallites and the resultant magnetoresistance behaviors, providing valuable insights for the development of graphene-based nanomaterials in spintronic and electromagnetic applications.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"23 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2026-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147681278","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":"S-defective SnIn4S8 coupled with solvent engineering for efficient photooxidation of HMF to DFF","authors":"Yameng Zhang, Guoyang Gao, Yulong An, Fuyan Kang, Luwen Xu, Jingyi Qin, Liquan Jing, Zhanhua Huang","doi":"10.1016/j.jallcom.2026.188020","DOIUrl":"https://doi.org/10.1016/j.jallcom.2026.188020","url":null,"abstract":"Bimetallic sulfides demonstrate remarkable photocatalytic activity in the conversion of 5-hydroxymethylfurfural (HMF); however, they confront obstacles linked to heightened recombination rates of photogenerated charges. In this study, a SnIn<ce:inf loc=\"post\">4</ce:inf>S<ce:inf loc=\"post\">8</ce:inf> photocatalyst was synthesized via a Pluronic F-68-assisted solvothermal method. The incorporation of Pluronic F-68 triggered amorphous structuring in the material and sulfur vacancies, markedly mitigating recombination among photogenerated charge carriers. Optimization of the water/acetonitrile ratio markedly enhanced both the conversion of 5-hydroxymethylfurfural (HMF) and the selectivity toward 2,5-diformylfuran (DFF). At the optimal ratio of 9:1, the HMF conversion reached 91.7%, and the DFF selectivity was 77.6% after 4 h of illumination. Through electron paramagnetic resonance (EPR) analysis, the presence of sulfur vacancies was identified, which accelerated carrier partitioning and boosted photocatalytic efficiency. Density functional theory (DFT) calculations further revealed that an appropriate mixed solvent diminished the energy barrier to activation and accelerated the reaction rate. Density functional theory (DFT) calculations indicate that compared with the pure water system, the reaction barrier of HMF in the water/acetonitrile mixed solvent (9:1) is reduced, thereby accelerating the reaction rate. This study presents a simple and effective Pluronic F-68-assisted defect-engineering strategy and constructs a unique crystalline–amorphous structure, demonstrating that solvent optimization can enhance photocatalytic performance without catalyst modification, which is of great significance for the enhanced-value exploitation of biomass-derived feedstocks.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"130 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2026-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147681243","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":"Supercritical CO2-Assisted Cobalt Nanoparticles on N-Doped Graphene Nanoribbons for Significantly Enhanced Oxygen Reduction and Zinc-Air Batteries","authors":"Tingting Xiang, Ao Lv, Ruibo Wang, Ru Cheng, Yicheng Wang, Chenglong Chen, Juan Yang","doi":"10.1016/j.jallcom.2026.188019","DOIUrl":"https://doi.org/10.1016/j.jallcom.2026.188019","url":null,"abstract":"Transition metal-nitrogen-carbon composites, particularly those based on cobalt, have emerged as promising non-precious metal electrocatalysts for the oxygen reduction reaction (ORR), offering a viable alternative to platinum-based catalysts.In this work, an innovative supercritical CO₂ (CO₂)-assisted strategy was utilized to help the synthesis of high-performance ORR catalyst with uniformly dispersed cobalt nanoparticles on N-doped graphene nanoribbons, denoted as sCo@N-GNRs. The scCO₂ environment facilitates uniform dispersion of the cobalt precursor and promotes the formation of a tailored nanoarchitecture with an increased specific surface area, exposed more active edges for catalytic performance. This unique configuration markedly increases accessible active sites and enhances charge transfer kinetics. The optimized sCo@N-GNRs exhibits outstanding ORR activity in alkaline medium, as evidenced by a high half-wave potential of 0.835<!-- --> <!-- -->V and remarkable stability. The zinc-battery with sCo@N-GNRs as cathode achieves a peak power density of 177<!-- --> <!-- -->mW<!-- --> <!-- -->cm^-2 and a specific capacity of 785 mAh g_Zn^-1 (at 10<!-- --> <!-- -->mA<!-- --> <!-- -->cm^-2), demonstrating substantial potential for advanced energy conversion devices.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"2 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2026-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147666816","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 giant dielectric behavior of perovskite (Na0.2La0.2Ba0.2Sr0.2Ca0.2)Ti0.9Nb0.1O3 ceramics synthesized by spark plasma sintering","authors":"Lida Tong, Kailong Ma, Shuo Wang, Liang Dong, Jinsheng Li, Chen Chen, Pengfei Li, Shaohong Liu, Xiwei Qi","doi":"10.1016/j.jallcom.2026.187990","DOIUrl":"https://doi.org/10.1016/j.jallcom.2026.187990","url":null,"abstract":"With the rapid development of microelectronic technologies toward high integration and miniaturization, there is an increasingly urgent demand for dielectric materials with both a colossal dielectric constant (<ce:italic>ε</ce:italic>ᵣ &gt; 10<ce:sup loc=\"post\">4</ce:sup>) and low dielectric loss (tan<ce:italic>δ</ce:italic> &lt; 0.01). SrTiO<ce:inf loc=\"post\">3</ce:inf> exhibits excellent dielectric stability over a wide temperature and frequency range, making it a highly promising candidate for colossal dielectric applications. However, its practical application is still hindered by controversial intrinsic mechanisms, high dielectric loss, and low dielectric constant. In this study, perovskite ceramics with the composition (Na<ce:inf loc=\"post\">0.2</ce:inf>La<ce:inf loc=\"post\">0.2</ce:inf>Ba<ce:inf loc=\"post\">0.2</ce:inf>Sr<ce:inf loc=\"post\">0.2</ce:inf>Ca<ce:inf loc=\"post\">0.2</ce:inf>)Ti<ce:inf loc=\"post\">0.9</ce:inf>Nb<ce:inf loc=\"post\">0.1</ce:inf>O<ce:inf loc=\"post\">3</ce:inf> were synthesized via traditional solid-state sintering (TS) and spark plasma sintering (SPS) methods. All the samples possessed a pure perovskite structure without any secondary phases. In comparison with the TS ceramics, the SPS-derived ceramics exhibited a smaller average grain size and higher densification. Furthermore, a colossal room-temperature relative dielectric constant (<ce:italic>ε</ce:italic><ce:inf loc=\"post\">r</ce:inf> = 91921) was achieved by the SPS ceramics at 1 kHz, which was approximately 430 times higher than that of the TS ceramics (<ce:italic>ε</ce:italic><ce:inf loc=\"post\">r</ce:inf> = 214). Alternating current (AC) impedance spectroscopy and X ray photoelectron spectroscopy (XPS) demonstrated that the colossal permittivity (CP) behavior could be attributed to the formation of [Ti<ce:sup loc=\"post\">4+</ce:sup>·e-<mml:math altimg=\"si0002.svg\"><mml:msubsup><mml:mrow><mml:mtext>V</mml:mtext></mml:mrow><mml:mrow><mml:mtext>O</mml:mtext></mml:mrow><mml:mrow><mml:mtext>··</mml:mtext></mml:mrow></mml:msubsup></mml:math>- Ti<ce:sup loc=\"post\">4+</ce:sup>·e] defect dipoles around oxygen vacancy sites. These results demonstrate that SPS processing is an effective strategy for tailoring defect structures and achieving CP in perovskite ceramics.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"21 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2026-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147681244","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":"Effect of doping with different elements on the properties of strontium aluminate-based phosphors: A review","authors":"Shiqi Lou, Kun Zhang, Guotai Zhou, Guiying Wang","doi":"10.1016/j.jallcom.2026.187969","DOIUrl":"https://doi.org/10.1016/j.jallcom.2026.187969","url":null,"abstract":"Element-doped strontium aluminate (SrAl<ce:inf loc=\"post\">2</ce:inf>O<ce:inf loc=\"post\">4</ce:inf>)-based phosphors have attracted increasing research interest owing to their high luminescence intensity, long persistent luminescence, environmental friendliness, and non-radioactive nature. These materials are widely applied in various fields, including display lighting, safety signage, and biological imaging. In recent years, significant progress has been achieved in tailoring their crystal structure, trap energy levels, and luminescence behavior through optimized doping strategies and synthesis methods. As a result, enhanced luminous efficiency and improved energy utilization have been realized. This paper systematically reviews recent advances in SrAl<ce:inf loc=\"post\">2</ce:inf>O<ce:inf loc=\"post\">4</ce:inf> phosphors doped with rare-earth (RE) elements, transition metal (TM) elements, and other functional dopants. Particular attention is given to the effects of doping on crystal growth, electronic band structure, and trap regulation. The synergistic luminescence mechanisms between activators and co-activators, as well as the energy storage and release processes underlying persistent luminescence, are discussed in detail. Furthermore, the key challenges associated with these doped systems, including the modulation of persistent luminescence dynamics, spectral stability, and environmental adaptability, are critically summarized. This review aims to provide a theoretical foundation for the design and development of high-performance SrAl<ce:inf loc=\"post\">2</ce:inf>O<ce:inf loc=\"post\">4</ce:inf>-based phosphors and to expand their potential in diverse application fields.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"56 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2026-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147681251","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":"Thermoluminescence properties and trap hierarchy of GdBa₃B₉O₁₈ revealed by multi-method kinetic analysis","authors":"Abeer S. Altowyan, E.A. Cin, M. Oglakci, Jabir Hakami, M.B. Coban, U.H. Kaynar, N. Can","doi":"10.1016/j.jallcom.2026.187968","DOIUrl":"https://doi.org/10.1016/j.jallcom.2026.187968","url":null,"abstract":"This work reports the first thermoluminescence (TL) investigation of trigonal borate phosphor GdBa₃B₉O₁₈. The material was synthesized via a urea-assisted sol–gel combustion route and structurally confirmed as a single-phase trigonal borate with space group (P6₃/m). The TL response was evaluated under β-irradiation over a dose range of 1.4–500 Gy through dose–response, fading, reusability, and heating-rate experiments combined with a multi-method kinetic analysis. The integrated TL signal exhibits a near-linear power-law dose dependence (<ce:italic>b</ce:italic> ≈ 1.01) between 1.4 and 200 Gy, followed by only mild supralinearity up to 500 Gy. A minimum detectable dose of ∼0.11 Gy was obtained, indicating potential applicability in medium- to high-dose dosimetry. Reusability tests reveal cycle-to-cycle variations within ±5% over ten irradiation–readout cycles while maintaining a stable glow-curve structure. Heating-rate measurements (0.5–4 °C s⁻¹), combined with the Kitis–Tuyn temperature-lag correction, confirm that the observed glow-peak shifts arise predominantly from intrinsic TL kinetics rather than instrumental artifacts. Variable-heating-rate (VHR), IR–T<ce:inf loc=\"post\">m</ce:inf>–T<ce:inf loc=\"post\">stop</ce:inf>, and computerized glow-curve deconvolution (CGCD) analyses indicate a hierarchical trap structure with activation energies ranging from ∼0.87–1.98 eV and general-order kinetics (<ce:italic>b</ce:italic> ≈ 1.2–1.5), consistent with an energetically distributed trap system. Fading measurements reveal an unusual anti-fading behaviour, where the TL intensity reaches a maximum after ∼12 h prior to the onset of conventional decay. Extended measurements up to 20 days further confirm that this non-monotonic behavior evolves into a long-term decay regime. This behavior is consistent with time-dependent charge redistribution from shallow to deeper traps via retrapping processes. Overall, these results demonstrate that GdBa₃B₉O₁₈ is a structurally stable borate phosphor with robust TL characteristics and promising potential for dosimetric applications in the Gy dose regime.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"83 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2026-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147681277","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}