Journal of Alloys and Compounds最新文献

{"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":"Optimization of trade-off between mobile carriers and surface defects for enhanced H2S sensing in SnO2-decorated In2O3 nanocomposites via two-step temperature and pressure control","authors":"Jiyeon Shin, Jeong Yun Hwang, Jimyeong Park, Ok Sung Jeon, Jae-Hyoung Lee, Seung Yong Lee, Changhyun Jin, Myung Sik Choi","doi":"10.1016/j.jallcom.2025.182584","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.182584","url":null,"abstract":"SnO₂-decorated In₂O₃ nanocomposites that feature nanoleaf-like SnO₂ grown on In₂O₃ nanocubes via a surface-wrapping mechanism were synthesized using two consecutive hydrothermal methods. These samples exhibited an unusual temperature-dependent response to H₂S gas (150 °C &gt; 200 °C &gt; 100 °C &gt; 250 °C), which contrasts with the typical behavior of semiconductor gas sensors. This nonlinear trend is attributed to the dominance of different sensing mechanisms: an oxygen vacancy-controlled mode between 100 and 150 °C and a majority carrier-controlled mode between 200 and 250 °C. The results highlight the importance of balancing the trade-off between operating temperature and surface-defect concentration to enhance gas sensing.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"7 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144737616","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":"Additive manufacturing and in-situ reaction synthesis of high-performance and complex-shaped TiC-NiAl composites","authors":"Fuyuan Zheng, Xiujuan Chen, Yueming Li, Shouyin Xu, Yunhui Li, Qingming Xu, Jianwei Zhu, Yumin Liu, Guorui Zhao","doi":"10.1016/j.jallcom.2025.182663","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.182663","url":null,"abstract":"Additive manufacturing of ceramic matrix composites has significant potential for industrial applications, particularly in producing parts with highly customized production of specific structural and functional characteristics of parts, while its fabrication still faces many challenges. In this study, a novel technology, Powder Extrusion Printing (PEP) combined with in-situ reaction, was successfully employed to prepare the high performance of TiC matrix composite cutting tools using Ti₃AlC₂ and Ni as raw materials. The formation of TiC and NiAl was observed in the sintered sample. The crystallographic orientation relationships in TiC-Ti₂AlC-NiAl interfaces were also determined, as follows: TiC [11-2]∥Ti₂AlC [1-100]∥NiAl [-110], TiC (111)∥Ti₂AlC (000-2)∥NiAl (110). As the load increases from 0.3<!-- --> <!-- -->kg to 10<!-- --> <!-- -->kg, the Vickers hardness (HV) gradually decreases from 12.51±0.40<!-- --> <!-- -->GPa to 11.12±0.10<!-- --> <!-- -->GPa. The three-point bending strength, fracture toughness (K_IC) and compressive strength of the sintered samples were 528.30±63<!-- --> <!-- -->MPa, 6.31±0.17<!-- --> <!-- -->MPa·m^1/2 and 1211±165<!-- --> <!-- -->MPa, respectively. Thus, this technology exhibits excellent application potential in the fabrication of ceramic-based composites with complex shapes.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"26 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144737569","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":"Extraction of Molybdenum Trioxide from Molybdenum Calcine through Vacuum Decomposition and Volatilization","authors":"Shanpeng Kang, Qian Ren, Pengkun Zhang, Fei Wang, Baoqiang Xu, Bin Yang","doi":"10.1016/j.jallcom.2025.182665","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.182665","url":null,"abstract":"Molybdenum calcine serves as a critical intermediate in molybdenum metallurgy and primary raw material used to produce high-purity molybdenum trioxide. However, the current processes for producing molybdenum trioxide from low-grade molybdenum calcine are hindered by high separation costs, poor adaptability to raw materials, and excessive wastewater discharge. In this study, direct separation of molybdenum trioxide from low-grade molybdenum calcine by vacuum decomposition and volatilization was proposed. In this process, molybdenum trioxide was explored by volatilization and molybdate decomposition. The heating conditions in vacuum were also investigated on the extraction rate and the purity of molybdenum trioxide. High-purity (&gt;99%) MoO₃ was obtained through one-step vacuum volatilization. After further vacuum purification, the purity of molybdenum trioxide increased to 99.975%. The method provides a reference for the efficient extraction of molybdenum trioxide from low-grade molybdenum calcine.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"13 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144737615","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":"Ho3+-Mediated NIR-II Ratio Thermometer Based on Phonon-Assisted Energy Transfer","authors":"Mingqin Huang, Mengmeng Dai, Kejie Li, Jiaqi Zhao, Guiying Liang, Yanling Wei, Zuoling Fu","doi":"10.1016/j.jallcom.2025.182655","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.182655","url":null,"abstract":"The development of high performance near-infrared II (NIR-II, 1000-1700<!-- --> <!-- -->nm) luminescent thermometers presents significant challenges in balancing thermal quenching effects while achieving superior temperature sensitivity for advanced applications in bioimaging and optical sensing. Herein, by engineering dual energy transfer channels (Yb³⁺→Er³⁺→Ho³⁺ and Yb³⁺→Ho³⁺→Tm³⁺), we achieve Ho³⁺-mediated NIR-II ratio thermometers in the higher phonon energy of KLu(MoO₄)₂ based on phonon-assisted energy transfer (PAET), exploiting the strong temperature-dependence downshifting luminescence (Er³⁺: ⁴I_13/2 → ⁴I_15/2 transition, ~1550<!-- --> <!-- -->nm; Ho³⁺: ⁵I₆ → ⁵I₈ transition, ~1200<!-- --> <!-- -->nm; Tm³⁺: ³F₄ → ³H₆ transition, ~1617<!-- --> <!-- -->nm). The rate equations reveal that the phonon energy of the host (~870<!-- --> <!-- -->cm⁻¹) critically enhances the non-radiative (NR) transitions, allowing efficient population redistribution in the excited state of the lanthanides through PAET processes. Finally, the optimized KLu(MoO₄)₂: 12Yb³⁺, 0.2Ho³⁺, 0.4Tm³⁺ system exhibits exceptional ratiometric thermometric performance with a maximum relative sensitivity (S_r) of 0.45% K^-1 at 313<!-- --> <!-- -->K. This study highlights the critical role of the multiple phonon mode of the host material in both boosting the downshifting luminescence and providing valuable insights for the design of NIR-II ratiometric luminescence thermometers.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"8 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144737565","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":"Structural, optical, elastic and humidity sensing properties of magnesium ferrite - polyaniline nanocomposites","authors":"S.S. Shewale, B.M. Palve, N.A. Shah, P.S. Solanki, N.P. Barde, P.P. Bardapurkar","doi":"10.1016/j.jallcom.2025.182607","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.182607","url":null,"abstract":"Polyaniline (PANI) is most suited material for humidity sensing, but has its own limitations. Nanocomposites of magnesium ferrite (MgF) and Polyaniline have been synthesized using sol gel auto combustion method; to improve the overall properties and stability. Samples were characterized using the standard XRD, FTIR, UV-Vis spectroscopy, SEM, EDS, BET and BJH techniques to explore their structural, optical, elastic and humidity sensing properties. XRD revealed cubic spinel structure of magnesium ferrite without much variation in lattice parameter and a semicrystalline nature of PANI. Crystallite size showed a variation from 12<!-- --> <!-- -->nm to 17<!-- --> <!-- -->nm obtained using XRD data by various methods including Scherrer, Williamson-Hall (W-H), Size-strain plot and Halder-Wagner methods. Intrinsic strain, stress, energy density of prepared samples were calculated using different models of W-H method. FTIR spectra shows shift in band position for specific ferrite content indicating interaction between ferrite and PANI. SEM micrographs exhibit pronounced effect on microstructure due to change in composition. EDS data confirms the phase purity as revealed by XRD earlier. Energy band gap obtained using UV-Vis spectroscopy shows decrement from 1.75<!-- --> <!-- -->eV to 1.41<!-- --> <!-- -->eV. Elastic and anisotropic properties of the nanocomposites including elastic moduli, acoustic wave velocities, directional dependency of Young’s modulus, elastic anisotropy indices, etc. have been discussed at length correlating the XRD and FTIR data. Humidity sensing properties have been investigated by measuring humidity dependent change in impedance. The sensing mechanism considering synthesis process, change in intrinsic conductivity of PANI, Grotthuss mechanism have been discussed at length. Results of humidity sensing parameters like hysteresis, sensitivity, stability, response and recovery time, etc. have reveal that change in composition has a momentous effect giving maximum sensitivity of 98.2%, applicability over a large humidity range, lowest response and recovery times of 3 and 12<!-- --> <!-- -->seconds respectively.","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":"144737610","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":"Elucidating the influence of temperature and strain rate on superplasticity of near-α Ti6321 titanium alloy","authors":"Wei Fan, Xiaofei Wu, Xuming Lin, Yifan Lv, Huiping Wu, Dayong An, Xifeng Li","doi":"10.1016/j.jallcom.2025.182641","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.182641","url":null,"abstract":"The superplastic forming (SPF) technique presents new potential for the near-<span><math><mi is=\"true\">α</mi></math></span> Ti6321 titanium alloy in the fabrication of critical ultra-thick components for the marine industry. This study investigates the effects of temperature and strain rate on the flow behavior, microstructural evolution, and deformation mechanisms of the Ti6321 alloy during superplastic deformation. Optimal SPF conditions are identified at 850℃/0.0005–0.001<!-- --> <!-- -->s^-1 and 900℃/0.0005–0.005<!-- --> <!-- -->s^-1, under which elongations exceeding 370% and a strain rate sensitivity above 0.3 are achieved, indicating excellent superplasticity. The enhanced<span><math><mspace is=\"true\" width=\"0.25em\"></mspace><mi is=\"true\">α</mi><mo is=\"true\">→</mo><mi is=\"true\">β</mi></math></span> dynamic phase transformation with increasing temperature moderately contributes to superplastic performance. A maximum elongation of 824.4% is attained at 900℃/0.0005<!-- --> <!-- -->s^-1 with an <span><math><mi is=\"true\">α</mi><mo is=\"true\">/</mo><mi is=\"true\">β</mi></math></span> phase ratio of 75/25, driven by synergistic interactions among grain boundary sliding, dynamic globularization, dynamic recrystallization, grain rotation, and active dislocation activity. However, at 950℃, a significantly higher <span><math><mi is=\"true\">β</mi></math></span>-phase content (~50%) induces dynamic grain coarsening and convergent evolution of microtexture in the <span><math><mi is=\"true\">α</mi></math></span> phase, which impedes grain rotation and leads to strain incompatibility between adjacent grains. Consequently, the macroscopic deformation is compromised due to the inability of existing mechanisms to effectively accommodate localized stress concentrations. At comparable <span><math><mi is=\"true\">β</mi></math></span>-phase fractions, a higher initial strain rate is found to promote grain refinement and orientation divergence, but also intensify dislocation multiplication. Pyramidal slips, particularly the first-order &lt;<span><math><mi is=\"true\">c</mi><mo is=\"true\" linebreak=\"badbreak\" linebreakstyle=\"after\">+</mo><mi is=\"true\">a</mi></math></span>&gt; slip, serve as the dominant slip mode in the primary <span><math><mi is=\"true\">α</mi></math></span> phase. These findings provide a mechanistic basis for optimizing SPF conditions in the Ti6321 alloy and offer novel insights into its marine applications.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"7 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144737640","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":"Synergistic enhancements of strength-ductility of α-Cu2Se via interlayer reinforcement","authors":"Zhongtao Lu, Chenyang Xiao, Xiege Huang, Yujing Liu, Guowei Niu, Bo Duan, Xiaobin Feng, Pengcheng Zhai, Guodong Li, Qingjie Zhang","doi":"10.1016/j.jallcom.2025.182635","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.182635","url":null,"abstract":"Robust mechanical performance is essential for thermoelectric (TE) material applications. Cu₂Se, a promising TE material, exhibits intrinsic room-temperature brittleness. In this work, the brittleness of <em>α</em>-Cu₂Se is attributed to weak interlayer Cu-Se bonding through density functional theory (DFT). To reinforce interlayer, weak Cu-Se bonds are substituted by Cu-S or Cu-Te bonds via doping. S-doping elevates cleavage energy and suppresses interlayer cleavages. Moreover, both dopants increase slip energy barriers, raising slip activation stress. Experimentally, compression tests on Cu₂Se, Cu₂Se_1-<em>x</em>S_<em>x</em> and Cu₂Se_1-<em>x</em>Te_<em>x</em> (<em>x</em> = 0-0.1) revealed that, Cu₂Se_0.9S_0.1 achieved simultaneously increases in strength (by 53%) and fracture strain (by 123%). Scanning electron microscope further confirmed the suppression of S-doping on high-density interlayer cleavages. This work provides an interlayer strengthening strategy for simultaneously improving ductility and strength of layered Cu₂Se.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"25 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144737562","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":"Effects of Si alloying on thermal deformation behavior, microstructure and mechanical properties of Mg-Y-Zn alloys with LPSO phase","authors":"Xuanzheng Lu, Wei Liu, Yuntao Zhang, Zhiqiang Li, Yuhong Zhao, Hua Hou","doi":"10.1016/j.jallcom.2025.182646","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.182646","url":null,"abstract":"In this work, the effects of Si alloying on thermal deformation behavior, microstructure and mechanical properties of Mg-Y-Zn alloys are investigated through hot compression and hot extrusion. By hot compression, it shows that the addition of Si can bring better plastic processing properties to the Mg-Y-Zn alloy by reducing the thermal deformation activation energy from 268.85<!-- --> <!-- -->kJ/mol to 133.23<!-- --> <!-- -->kJ/mol and decreasing the work hardening index from 7.7 to 4.95. By hot extrusion, firstly, it reveals that as the addition of Si content increases from 0 to 2 (at. %), the microstructure of Mg-Y-Zn alloy underwent significant changes. The original 18R-LPSO phase gradually disappears, while the new YSi and Y₂MgSi₂ phases emerge. Secondly, the grain size and the degree of dynamic recrystallization (DRX) grains gradually increase as the addition of Si. Thirdly, although Si alloying can enhance the elongation from 4.8% to 23.9%, the strength decreases. Notably, the product of strength and elongation (PSE) of Mg_97.5Y₁Zn_0.5Si₁ alloy achieves the highest value, which is 5.707<!-- --> <!-- -->GPa·%, suggesting a better balance of strength and elongation. Finally, the research combines with the finite element simulation (FEM) and phase field simulations, revealing that Si alloying facilitates grain growth and DRX by enhancing the heat of deformation. The YSi and Y₂MgSi₂ phases exhibit lower formation energies (-0.889<!-- --> <!-- -->eV/atom and -0.681<!-- --> <!-- -->eV/atom, respectively) compared to the 18<!-- --> <!-- -->R long period stacking ordered (LPSO) phase (-0.0999<!-- --> <!-- -->eV/atom), making them favorable to nucleate preferentially. Additionally, these YSi and Y₂MgSi₂ phases competitively consume Y atoms, thereby reducing the formation of the 18<!-- --> <!-- -->R LPSO phase. This work demonstrates that Si alloying represents an effective strategy for synergistically enhancing the thermal deformation capacity, mechanical properties of Mg-Y-Zn alloys.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"51 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144737607","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":"Crystal structure, improvement of nanostructure, electrical and magnetic properties of the BiFeO3/Sr0.6Ba0.4Nb2O6/SrRuO3/MgO(001) heterostructure","authors":"Ya.Yu. Matyash, N.V. Makinyan, D.V. Stryukov, K.M. Zhidel, A.V. Pavlenko","doi":"10.1016/j.jallcom.2025.182662","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.182662","url":null,"abstract":"The crystal structure, nanostructure, magnetic response, dielectric and ferroelectric properties of BiFeO₃/Sr_0.6Ba_0.4Nb₂O₆/SrRuO₃/MgO(001) and Sr_0.6Ba_0.4Nb₂O₆/SrRuO₃/MgO(001) heterostructures were studied. The nanoscale Sr_0.6Ba_0.4Nb₂O₆(120<!-- --> <!-- -->nm) and BiFeO₃(120<!-- --> <!-- -->nm) films were grown by the radio frequency cathode sputtering in an oxygen atmosphere and sequentially deposited on a SrRuO₃(150<!-- --> <!-- -->nm)/MgO(001) substrate. The BiFeO₃ and Sr_0.6Ba_0.4Nb₂O₆ layers obtained are epitaxial. Despite the deposition of the BiFeO₃ layer on top of the Sr_0.6Ba_0.4Nb₂O₆ layer, the BiFeO₃ crystallographic axes were formed parallel to the MgO(001) substrate axes. Deposition of BiFeO₃ layer on a Sr_0.6Ba_0.4Nb₂O₆ layer reduces roughness of the two-layer heterostructure. The voltage-induced regions (±10<!-- --> <!-- -->V) exhibit stability more than 6<!-- --> <!-- -->hours in both Sr_0.6Ba_0.4Nb₂O₆/SrRuO₃/MgO(001) and BiFeO₃/Sr_0.6Ba_0.4Nb₂O₆/SrRuO₃/MgO(001) heterostructures. The two-layer heterostructure demonstrates superior temperature stability of dielectric parameters compared to the single layer thin film. While magnetic response is absent in bulk BiFeO₃, there is one in BiFeO₃/Sr_0.6Ba_0.4Nb₂O₆/SrRuO₃/MgO(001) two-layer heterostructure. Thus, the formation of two-layer multiferroic heterostructure led to improvement of its nanostructure, ferroelectric, dielectric and magnetic properties in comparison with corresponding single layer thin films.","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":"144737727","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}