Journal of Alloys and Compounds最新文献

{"title":"Fluorine-Engineered Ni3S2/Co9S8 Nanorod Arrays as High-Efficiency OER Catalyst for Stable Seawater Electrolysis","authors":"Qingyu Shi, Zhikun Xu, Xiaotian Sun, Shuangyan Lin, Lin Li","doi":"10.1016/j.jallcom.2025.182649","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.182649","url":null,"abstract":"The development of high-performance non-precious electrocatalysts for seawater oxidation faces significant challenges from competing chlorine evolution and catalyst corrosion. Herein, we construct fluorine-doped Ni₃S₂/Co₉S₈ nanorod arrays on nickel foam (F-Ni₃S₂/Co₉S₈) as a robust OER catalyst for alkaline seawater electrolysis. Experimental analyses reveal that fluorine doping effectively modulates the electronic structure of Ni/Co active centers, increases catalytically active sites, and enhances charge transfer kinetics, significantly boosting OER activity. Remarkably, F-Ni₃S₂/Co₉S₈ achieves industrially relevant current densities of 1000<!-- --> <!-- -->mA<!-- --> <!-- -->cm^-2 at low overpotentials of 345<!-- --> <!-- -->mV (alkaline freshwater) and 407<!-- --> <!-- -->mV (natural seawater). Importantly, it demonstrates excellent operational stability over 130<!-- --> <!-- -->h in harsh alkaline seawater conditions, due to its superior chloride corrosion resistance. Furthermore, F-Ni₃S₂/Co₉S₈ exhibits exceptional OER selectivity with a Faradaic efficiency of ~95% and no detectable hypochlorite formation. When configured in a full electrolyzer with Pt/C, the system requires only 1.74<!-- --> <!-- -->V and 1.78<!-- --> <!-- -->V to deliver 100<!-- --> <!-- -->mA<!-- --> <!-- -->cm⁻² in freshwater and seawater electrolytes, respectively. This work provides valuable insights into fluorine-mediated catalytic enhancement and presents a promising strategy for developing efficient seawater electrolysis systems.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"27 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144737724","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 conduction mechanism and performance of LaCr0.7Fe0.3O3-BaTiO3 ceramics as wide-temperature-range NTC thermistor materials","authors":"Jun-Tao Huang, Meng-Han Yan, Sai-Fei Wang, Hai-Hua Huang, Xin-Yao Deng, Wen-Jun Chen, Tao Zhao, Wei Li, Shu-Zhong Lin, Zhen-Xiang Cheng, Mahesh Kumar Joshi, Peng Fu","doi":"10.1016/j.jallcom.2025.182661","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.182661","url":null,"abstract":"In this work, <em>x</em>LaCr_0.7Fe_0.3O₃-(1-<em>x</em>)BaTiO₃ (<em>x</em>LCF-BT, <em>x</em> = 0.05, 0.10, 0.15, and 0.20) ceramics were prepared via the solid-phase synthesis. The study found that all samples exhibited the single perovskite structure, and the addition of LCF reduced the grain size and bandgap of the ceramics. All ceramic samples have a negative temperature coefficient (NTC) effect, as the LCF content increased, the resistivity <em>ρ</em>₃₀₀ decreased from 2.32 × 10⁷ to 1.04 × 10⁵ Ω•cm, while thermal constant <em>B</em>_300/500 varied between 6673 and 11398<!-- --> <!-- -->K. <em>In situ</em> XPS analysis revealed that conduction in <em>x</em>LCF-BT ceramics involves electron hopping between heterovalent ion pairs (Cr³⁺/Cr⁴⁺ and Fe²⁺/Fe³⁺), with the NTC effect originating from increased electron hopping probability at elevated temperatures. Impedance analysis showed that the electrical inhomogeneity originated from grains and grain boundaries, and both grains and grain boundaries contributed to the NTC effect. Moreover, all ceramics exhibit good stability, showing resistance drift below 3.45%. These findings establish the LCF-BT system as a promising candidate for wide-temperature-range NTC thermistors and related applications.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"1 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144737608","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 new B-site doped mid-entropy ceramic Gd2(Ti1/3Zr1/3Sn1/3)2O7 for high-temperature thermal barrier coatings applications: preparation process, thermophysical properties, and mechanical properties","authors":"Fuxing Ye, Yuan Yao, Fanwei Meng, Ziqi Song","doi":"10.1016/j.jallcom.2025.182667","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.182667","url":null,"abstract":"Thermal barrier coatings (TBCs) are essential for improving the efficiency and service life of advanced aero-engines by providing thermal insulation under extreme operating conditions. As modern aero-engines continue to demand higher inlet temperatures, there is an urgent need to develop new TBC ceramics with superior thermophysical and mechanical properties to extend service life and operational limits. In this work, a mid-entropy pyrochlore ceramic, Gd₂(Ti_1/3Zr_1/3Sn_1/3)₂O₇ (GTZS), was designed by multi-component B-site doping to simultaneously achieve ultra-low thermal conductivity, excellent sintering resistance and enhanced mechanical reliability. Comprehensive characterization including XRD, high-resolution TEM and long-term annealing up to 100<!-- --> <!-- -->h at 1600 ℃ confirmed that GTZS maintains a stable single-phase pyrochlore structure with an exceptionally low grain growth rate (8.8<!-- --> <!-- -->nm/h), indicating superior sintering resistance. Additionally, GTZS possessed an ultra-low thermal conductivity (0.92-0.85<!-- --> <!-- -->W⋅m^-1⋅K^-1, 25-1100 ℃) due to intense phonon scattering induced by structural disorder and excess oxygen vacancies, while the coefficient of thermal expansion (10.5 × 10⁻⁶ K⁻¹, 1200 ℃) is well-matched to that of Al₂O₃ thermally grown oxide (TGO) layers. Mechanical tests revealed a high fracture toughness (2.63<!-- --> <!-- -->MPa·m^1/2) and a relatively low Young’s modulus (192<!-- --> <!-- -->GPa), which contribute to improved strain tolerance and resistance to crack propagation. These combined thermophysical and mechanical properties demonstrate the promise of mid-entropy pyrochlore GTZS for next-generation TBC applications.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"1 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144737612","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":"Constitutive relationship and deformation mechanism of SLM Ti-6Al-4V alloy under high strain rate","authors":"Chaorun Si ,&nbsp;Shuo Wang ,&nbsp;Haodong Sun,&nbsp;Yunhan Feng","doi":"10.1016/j.jallcom.2025.182659","DOIUrl":"10.1016/j.jallcom.2025.182659","url":null,"abstract":"<div><div>Titanium alloys used in the aerospace industry require increasingly enhanced impact resistance. To investigate the dynamic impact behavior of SLM Ti-6Al-4V alloy, impact tests were conducted using a SHPB apparatus to characterize its dynamic mechanical properties at strain rates ranging from 1000 to 3000 s⁻¹. The SHPB results, combined with quasi-static tensile data, were used to fit the Johnson-Cook constitutive model for SLM Ti-6Al-4V alloy under high strain rate conditions. EBSD analysis was performed on impacted specimens to investigate the underlying deformation mechanisms. The results indicate that a toughness-dominated mixed fracture occurs during the tensile loading of SLM Ti-6Al-4V alloy. Under impact loading, the alloy exhibits strain rate sensitivity, strain hardening, and strain rate-induced plasticity. These effects are accompanied by pronounced alterations in texture, grain morphology, and grain boundary characteristics. The Johnson-Cook model developed in this study effectively characterizes the dynamic impact behavior of SLM Ti-6Al-4V alloy, providing a foundation for its application in high-performance structural components.</div></div>","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"1038 ","pages":"Article 182659"},"PeriodicalIF":6.3,"publicationDate":"2025-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144737609","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":"“Giant” reverse type-I CdS/CdSe core/shell quantum dots for efficient visible light-induced hydrogen photogeneration from water","authors":"Siqi Wang ,&nbsp;Xueqi An ,&nbsp;Shuang Guo ,&nbsp;Long Yuan ,&nbsp;Ping Wang ,&nbsp;Xiaotian Yang","doi":"10.1016/j.jallcom.2025.182674","DOIUrl":"10.1016/j.jallcom.2025.182674","url":null,"abstract":"<div><div>Colloidal semiconductor quantum dots (QDs) have been considered an ideal model to unveil the detailed charge transfer dynamics for photocatalytic hydrogen evolution owing to their merits of precisely controlled band structures, high light absorption coefficients, and exceptional charge transport properties. Herein, we demonstrate that through the formation of “giant” reverse type-I CdS/CdSe core/shell QDs, the corresponding hydrogen photogeneration rate is much enhanced to 65.97 mmol·g⁻¹·h⁻¹ under the illumination of visible light (λ &gt; 420 nm), which is 6.6-fold higher than that of CdS QDs-based system. Photoluminescence lifetime and photoelectrochemical measurements reveal that the prolonged lifetime and significantly improved separation efficiency of charge carriers are supposed to be responsible for the enhancement.</div></div>","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"1038 ","pages":"Article 182674"},"PeriodicalIF":6.3,"publicationDate":"2025-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144748068","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":"Heterointerface rich CeO2-MoO2-Mo2C-C nanotube with the optimized composition and electronic structure via in-situ carburization towards highly efficient degradation of organic pollutants","authors":"Haizhen Wang, Zareen Suhara Nazeer Ali, Asad Syed, Hind A. AL-Shwaiman, S. Balasurya, Ling Shing Wong, Meenakshi Verma, S. Sudheer Khan","doi":"10.1016/j.jallcom.2025.182664","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.182664","url":null,"abstract":"The present study reported the construction of MoO₂/Mo₂C incorporated within a carbon matrix (MMC) decorated with CeO₂ nanoflowers to enhance the photocatalytic degradation of tetracycline under visible light irradiation. The MoO₂/Mo₂C-CeO₂ (MMC-CeO₂) nanocomposite (NCs) was synthesized via a chemical co-precipitation method followed by calcination. The formation of nanotube MMC structures and the deposition of CeO₂ nanoflowers were confirmed through SEM and HR-TEM analyses. XRD analysis validated the cubic phase of MoO₂ and the successful integration of CeO₂ over MoO₂/Mo₂C. The mesoporous nature, characterized by an H1 hysteresis loop and a type IV isotherm, was identified using BET and BJH analysis. Photoluminescence spectroscopy and Nyquist plots indicated a reduced charge carrier recombination rate and improved charge separation compared to CeO₂ and MMC. Ligand-to-metal charge transfer in MMC revealed electron migration from oxygen to Mo⁶⁺, as confirmed by prominent peaks in UV-vis absorption spectra. XPS analysis provided insights into the chemical states of elements, with peak shifts elucidating heterojunction formation. The optimized MMC-CeO₂-10 exhibited the highest photocatalytic activity, achieving 91% tetracycline degradation in 180<!-- --> <!-- -->min, with a regression coefficient of R² = 0.9519<!-- --> <!-- -->min⁻¹. The impact of various interfering ions and radical formation was investigated. Reusability studies demonstrated sustained photocatalytic efficiency of 89.6% after four cycles, confirming the material’s stability and resistance to photo-corrosion. The intermediates of the photocatalytic degradation reaction were determined using GC-MS/MS analysis and the plausible degradation pathway was proposed. The toxicity of the intermediates were assessed via insilico ECOSAR tool. These findings highlight MMC-CeO₂ as a highly efficient and stable photocatalyst for wastewater treatment applications.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"46 4 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144737571","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":"Outstanding OER performance under industrial conditions of porous branched high-entropy oxides prepared through anodization of FeCoNiMnTi alloy","authors":"Kai Lin, Mengyao Yang, Xixin Wang, Jianling Zhao, Zihan Li, Yaya Liu","doi":"10.1016/j.jallcom.2025.182670","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.182670","url":null,"abstract":"Due to the diversity of active sites and multi-component synergies of high-entropy oxides (HEO), they have received extensive attention in the field of OER catalysis. However, there are still great challenges in exploring new preparation strategy and achieving precise morphology control of HEO. In this study, the HEO self-supported electrodes (f-MOx@f-MA) were prepared via anodization of FeCoNiMnTi alloy (f-MA). The influence of anodization parameters and annealing temperature on the morphology, structure, and OER catalytic performance were investigated in detail. Under optimal conditions (1<!-- --> <!-- -->M KOH), a porous branch-like high-entropy oxide (f-MOx) with an amorphous structure was obtained, which exhibits an impressively low overpotential of 185<!-- --> <!-- -->mV at 10<!-- --> <!-- -->mA/cm² (η₁₀), accompanied by a corresponding Tafel slope of 40.3<!-- --> <!-- -->mV/dec. The OER catalytic activity and stability of f-MOx@f-MA is much superior to benchmark IrO₂. Furthermore, under industrial conditions (50 °C, 6<!-- --> <!-- -->M KOH, 400<!-- --> <!-- -->mA/cm²), f-MOx@f-MA also demonstrates superior OER catalytic activity and unwavering stability. Notably, after an uninterrupted 120-hour operation under industrial conditions, the η₁₀ value of f-MOx@f-MA is only 154<!-- --> <!-- -->mV, which is 18<!-- --> <!-- -->mV lower than the original sample. The outstanding OER performance of f-MOx@f-MA can be ascribed to the efficient integration of the close-connected interface between in-situ grown HEO and the alloy substrate, the nanoporous branched structures, and the harmonious synergistic effects among multi-component amorphous oxides. All these factors endow the f-MOx@f-MA with enhanced OER catalytic activity and stability and its comprehensive performance surpasses most of the recently reported high-entropy oxide electrodes.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"97 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144737611","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 comprehensive review of aspects of columnar to equiaxed transition, phase stability, and properties in novel Ti-alloys developed by additive manufacturing","authors":"Ipsita Mohanty, Sujoy Kumar Kar","doi":"10.1016/j.jallcom.2025.182642","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.182642","url":null,"abstract":"Development of novel Ti-alloys via additive manufacturing (AM) by exploring newer β Ti alloy space is gaining significant importance. Although the AM process addresses the segregation issue associated with the Ti-alloys with higher β stabilizer content, the formation of columnar prior β-grains leading to microstructural and property anisotropy becomes challenging. Thermodynamics-guided alloying strategy can be adopted for facilitating the columnar to equiaxed transition (CET) of AM built Ti alloys by minimizing the steep thermal gradients. The co-relation between the governing thermodynamic parameters (which are functions of composition) and CET, for various types (Isomorphous and Eutectoid) of β stabilizers has been studied with the help of CALPHAD simulated phase diagrams and demonstrated via comparative plots to understand the correct alloying strategy. The effect of different β-alloying on the resulting mechanical properties are discussed via comparative studies that will help in selecting a suitable β-Ti alloy (both high-strength metastable β alloys and stabilized β alloys) for specific application. The β-isomorphous alloys find their primary applicability in bio-medical industries, whereas the β-eutectoid high-strength Ti-alloys are applicable for structural applications in aerospace and automobile industries. This study also highlights the additional challenges (unmelted powders, porosity, brittle phase formation and reduced ductility) with various types of β alloying and strategies to overcome those issues. Datapoints for new Ti-alloys showing CET and improved properties are mapped in the molecular orbital (<span><math><mover accent=\"true\" is=\"true\"><mrow is=\"true\"><mi is=\"true\" mathvariant=\"italic\">Bo</mi></mrow><mo is=\"true\">̅</mo></mover><mo is=\"true\" linebreak=\"badbreak\" linebreakstyle=\"after\">−</mo><mover accent=\"true\" is=\"true\"><mrow is=\"true\"><mi is=\"true\" mathvariant=\"italic\">Md</mi></mrow><mo is=\"true\">̅</mo></mover></math></span>) space, and new vectors have been introduced for designing newer alloys based on Ti64.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"15 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144737566","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":"Enhanced thermal stability and charge transfer band redshift induced ratiometric thermometry of Sr2Al2SiO7:Sm3+/K+ phosphors","authors":"Xiuying Tian, Shiyi Zhang, Qian Zhou, Jin Wen, Changyan Ji, Zhi Huang, Ling Zhu, Fei Luo, Xin Liu, Jing Li, Hongxia Peng, Shuying Zhou, Guowen Li, Hua-Tay Lin","doi":"10.1016/j.jallcom.2025.182656","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.182656","url":null,"abstract":"In this study, Sr₂Al₂SiO₇: Sm³⁺ and Sr₂Al₂SiO₇: Sm³⁺/K⁺ phosphors were synthesized via a high-temperature processing for remote temperature sensing applications. X-ray diffraction (XRD) analysis confirmed the tetragonal gehlenite structure of Sr₂Al₂SiO₇ with space group <em>P</em><span><math><mover accent=\"true\" is=\"true\"><mrow is=\"true\"><mn is=\"true\">4</mn></mrow><mo is=\"true\">̅</mo></mover></math></span>2<!-- --> ₁<em>m</em> and the presence of impurity phases, which also confirmed the effective replacement of Sr²⁺ by Sm³⁺ in the crystal structure. Scanning electron microscopy (SEM) observations showed irregular grain morphology and severe particle agglomeration. The particle size distribution of the sample ranges from 5 to 95 μm, with the particles mainly concentrated around 22.54 μm. EDS mappings verified the presence of Sm³⁺ and K⁺ ions within the crystal structure. UV-vis diffuse reflection spectra and bandgap calculations indicated a reduced bandgap due to doping. PL and PLE spectra demonstrated concentration-dependent characteristics, with optimal concentrations of 0.03 for Sm³⁺ and 0.04 for K⁺. Temperature-dependent PL and PLE measurements revealed enhanced thermal stability and temperature sensitivity upon K⁺ doping, with thermal stability improving from 86.015% to 90.86% at 423<!-- --> <!-- -->K. The observed redshift in PLE spectra with increasing temperature was explained. Furthermore, the temperature-dependent redshift of CTB and the ⁶H_5/2→⁴F_7/2 transition were then effectively utilized for thermometry. The relative sensitivity reached 0.472% K^-1 at 473<!-- --> <!-- -->K, showing competitive performance compared to other phosphors despite a higher working temperature. A single band ratio (SBR) thermometry based on LIR of the peak at 601<!-- --> <!-- -->nm was constructed using two excitation wavelengths (250<!-- --> <!-- -->nm and 404<!-- --> <!-- -->nm). The maximum absolute sensitivity was 1.86×10^-3 K^-1 at 573<!-- --> <!-- -->K, and the relative sensitivity was 0.558% K^-1 at 462<!-- --> <!-- -->K. These results highlight the potential of Sr₂Al₂SiO₇: Sm³⁺/K⁺ for high-temperature optical thermometry applications.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"139 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144737613","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":"Controlled synthesis of Yb3 + /Er3+ co-doped ZrO2 phases and their luminescence properties","authors":"Yifan Leng ,&nbsp;Fengqin Lai ,&nbsp;Yaochun Qiang ,&nbsp;Wenchao Li ,&nbsp;Weixiong You","doi":"10.1016/j.jallcom.2025.182657","DOIUrl":"10.1016/j.jallcom.2025.182657","url":null,"abstract":"<div><div>The structural configuration of materials critically influences the upconversion luminescence (UC) properties of Er³ ⁺ ions. However, the complex interplay of structure-property factors poses significant challenges in elucidating structure-property relationships. Leveraging the polymorphs nature of ZrO₂ (exhibiting three distinct crystalline phases), this study effectively decouples compositional variables from structural effects. Through systematic comparative analysis of UC behavior across ZrO₂ polymorphs, we establish a comprehensive framework for understanding structure-property Er³ ⁺ photophysics. Utilizing the sol-gel method, we achieved controlled synthesis of Yb³ ⁺/Er³ ⁺ co-doped ZrO₂ phases by precisely regulating rare-earth ion concentrations and sintering parameters, followed by comprehensive characterization of their upconversion luminescence behavior. Experimental results reveal a progressive phase transition from monoclinic to tetragonal and finally cubic phases in ZrO₂ with increasing total rare-earth doping concentration at the sintering temperature of 1200 °C, exhibiting contrasting behavior compared to temperature-dependent phase evolution under fixed doping conditions. The observed luminescence disparities in ZrO₂ phases primarily originate from synergistic effects of four key parameters: phonon energy characteristics, crystal field strength modulation, interionic distance distribution, and host material band gap properties. Notably, smaller phonon energy values, weaker crystal field effects, narrower band gaps, and expanded rare-earth separation distances demonstrate enhanced promotion of upconversion luminescence intensity. Finally, our study revealed that the temperature sensing performance of Yb³ ⁺/Er³ ⁺ co-doped multiphase ZrO₂ exhibits significant crystal phase dependence, which can be utilized to achieve optimized designs for various application scenarios.</div></div>","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"1038 ","pages":"Article 182657"},"PeriodicalIF":6.3,"publicationDate":"2025-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144748070","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}