Journal of Alloys and Compounds最新文献

{"title":"Tuning the excellent microwave absorption properties of flaky FeSiCr/paraffin composites by percolation theory principle","authors":"Haonan Zhang, Xichun Zhong, Na He, Jinwen Hu, Hanxing Xu, Xuefeng Liao, Qing Zhou, Zhongwu Liu, R.V. Ramanujan","doi":"10.1016/j.jallcom.2025.184222","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.184222","url":null,"abstract":"The relationships between the electrical conductivity and the microwave absorption properties of flaky FeSiCr/paraffin (FFSC/P) composites were studied. When the filler loading reached the percolation threshold, the FFSC/P absorber had better electromagnetic parameters, reflection loss, and absorption bandwidth. With a filler loading of 30<!-- --> <!-- -->wt%, the FFSC/P absorber exhibited a strong reflection loss of −44.36<!-- --> <!-- -->dB in the C-band (4−8<!-- --> <!-- -->GHz) and an absorption bandwidth of 5.08<!-- --> <!-- -->GHz covering the whole X-band (8−12<!-- --> <!-- -->GHz). This work has demonstrated a route for the materials design of high-performance microwave absorbers.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"115 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145235061","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":"Sol–Gel Synthesis and Multifunctional Characterization of Mo-Substituted YIG for High-Sensitivity Photodetection","authors":"Nguyen Phuc Duong, Dao Thi Thuy Nguyet, Nguyen Minh Vuong, To Thanh Loan, Nguyen Thi Nguyen","doi":"10.1016/j.jallcom.2025.184235","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.184235","url":null,"abstract":"We investigated the influence of molybdenum (Mo) doping on the structural, magnetic, electrical, and optoelectronic properties of yttrium iron garnet (YIG) synthesized via the sol–gel method. X–ray diffraction (XRD) with Rietveld refinement confirmed a single-phase garnet structure (<em>x</em> = 0–0.1), showing slight lattice expansion and crystallite growth due to oxygen vacancies and Fe²⁺ formation as charge-compensation mechanisms. Scanning electron microscopy reveals a morphology shift from dendritic networks (<em>x</em> = 0) to porous agglomerates (<em>x</em> ≥ 0.06). We observed a blue shift (~2–3<!-- --> <!-- -->cm⁻¹) of Fe–O vibrational modes and mode splitting in the Raman spectra at high Mo levels, indicating local lattice distortion. ICP-OES verifies Mo incorporation close to nominal values. Magnetic measurements at 5<!-- --> <!-- -->K reveal long-range ferrimagnetism, but saturation magnetization and Curie temperature (<em>T</em>_C ~545<!-- --> <!-- -->K for undoped YIG) decrease with increasing Mo, consistent with Fe³⁺ → Mo⁵⁺ substitution and charge compensation. <em>T</em>_C aligns with models where Mo occupies mainly octahedral sites at low doping and both octahedral/tetrahedral sites at higher levels. Mo doping lowers room-temperature resistivity from ~10¹⁰ Ω to &lt;8 × 10⁴ Ω (<em>x</em> = 0.1), showing n-type behavior with ~0.19<!-- --> <!-- -->eV activation energy. Under 914<!-- --> <!-- -->nm illumination, Mo-doped YIG exhibits a strong bolometric response (<em>I</em>_ph ~270<!-- --> <!-- -->µA, responsivity ~2.16 × 10³ mAW^-1, D* ~10^{9<!-- -->}cm·Hz¹ᐟ²·W^-1), surpassing many oxide-based bolometric materials, highlighting its potential for advanced bolometers and spintronic devices.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"19 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145235240","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":"Interface regulation strategy to prepare high strength and electrical conductivity of nanocarbon/Al composites","authors":"Shuai Zhang, Xun Sun, Qingyu Shi, Tao Wang, Gaoqiang Chen, Mengran Zhou","doi":"10.1016/j.jallcom.2025.184242","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.184242","url":null,"abstract":"Nanocarbons are promising reinforcements to address the long-standing strength-electrical conductivity trade-off in pure Al. However, the underlying mechanisms through which nanocarbon/Al interface structures and compositions influence these properties exhibit substantial discrepancies and controversy. Herein, the interface-property relationships in graphene oxide (GO) and graphene (GR) reinforced Al matrix nanocomposites fabricated by friction stir processing were systematically analyzed. Due to the reaction between oxygen containing functional groups on GO surface and Al matrix under thermo-mechanical conditions, GO was in-situ reduced to GR. Sandwiched interfaces, GR/Al₂O₃/Al, were obtained in the GO/Al nanocomposite. The strengthening efficiency induced by GR/Al₂O₃/Al interfaces was only 42. Meanwhile, the non-conductive Al₂O₃ transition layer exacerbated the electron scattering effects induced by interfaces, leading to a much lower electrical conductivity of nanocomposites. In contrast, clean and directly bonded interfaces formed in GR/Al nanocomposites achieved dual functional superiority: higher strengthening efficiency (90) and lower electron scattering. The strength of GR/Al nanocomposite was significantly improved while without sacrificing its electrical conductivity. These results indicated that clean and directly bonded nanocarbon/Al interfaces may be a potential structure basis for overcoming the strength-electrical conductivity trade-off in pure Al.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"79 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145235006","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":"PECVD-growth of GaS1–xSex films with composition-controlled structural, optical and electrical properties","authors":"Mikhail Kudryashov, Aleksey Nezhdanov, Yuliya Kudryashova, Aleksandr Mashin, Diana Fukina, Vladimir Malyshev","doi":"10.1016/j.jallcom.2025.184216","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.184216","url":null,"abstract":"The growth of GaS_{1–<em>x</em>}Se_<em>x</em> films (0 ≤ <em>x</em> ≤ 1) on a sapphire substrate (001) was achieved through plasma-enhanced chemical vapor deposition, utilizing elemental precursors. The non-equilibrium low-temperature RF discharge plasma was the trigger for the chemical reactions that occurred during the deposition. The reactive components of the plasma formed in the gas phase were studied by means of optical emission spectroscopy. All deposited films were found to have a layered hexagonal structure with preferential orientation (004) and were characterized by linearly increasing lattice parameters with increasing selenium content (<em>x</em>). A shift of the out-of-plane vibration modes was observed in the Raman spectra. The films exhibit high transparency, with values approaching 70%, in the 500-2500<!-- --> <!-- -->nm region. The samples of GaS_{1–<em>x</em>}Se_<em>x</em> luminesce from the blue to the red visible region, depending on their composition. It has been demonstrated that the substitution of sulfur for selenium results in a regular shift of the band edge and photoluminescence peaks to the long-wavelength region. The dependences of the surface morphology and conductivity on the composition were non-monotonic. The photosensitivity of the GaS_1-<em>x</em>Se_<em>x</em> films gradually increases with increasing selenium content, and pure gallium selenide has the maximum photoresponse. The comprehensive study of GaS_1-<em>x</em>Se_<em>x</em> films across the full compositional range allows to broadly consider them as a potential candidate for optoelectronic applications.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"103 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145235063","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":"Crystalline and amorphous phases combined Ni3S2/NF promotes water electrolysis under alkaline fluctuating power supply","authors":"Jiayun Zeng, Zhaotian Chen, Juan Wang, Gaofeng Zeng, Qin Zhong","doi":"10.1016/j.jallcom.2025.184210","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.184210","url":null,"abstract":"Direct coupling of renewable energy sources with water electrolysis for hydrogen production is critical to further reduce hydrogen costs and advance low-carbon development. To this end, a nickel foam-supported Ni₃S₂-2.0/NF electrocatalyst featuring amorphous-crystalline heterostructure is proposed. Ni₃S₂-2.0/NF demonstrates exceptional hydrogen evolution reaction (HER) performance, achieving ultralow overpotentials of 49<!-- --> <!-- -->mV at 10<!-- --> <!-- -->mA<!-- --> <!-- -->cm^-2 with 140<!-- --> <!-- -->h stability. Under simulated renewable energy fluctuations (50<!-- --> <!-- -->h accelerated degradation testing), Ni₃S₂-2.0/NF exhibits superior fluctuation resilience, showing the lowest 4.2% HER current density decay. Further investigation reveals that increasing the fluctuation frequency exacerbates current density decay. Critically, a two-electrode electrolyzer assembled with Ni₃S₂-2.0/NF enables direct solar-driven hydrogen production without power converters.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"21 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145235293","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":"Field-Free Spin-Orbit Torque Switching Enabled by Interlayer Dzyaloshinskii-Moriya Interaction in Ferrimagnetic Multilayers","authors":"","doi":"10.1016/j.jallcom.2025.184226","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.184226","url":null,"abstract":"Field-free spin–orbit torque (SOT) switching is a key technique for energy-efficient spintronic devices, yet its realization in perpendicular magnetic…","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"6 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145229325","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":"Al2O3 barrier layer for the synthesis of high-quality thermochromic SmNiO3 thin films annealed in air","authors":"Pierre-Antoine Tostivint, Arthur Tausch, Stéphanie Bruyère, Jérémie Drévillon, Fabien Capon","doi":"10.1016/j.jallcom.2025.184146","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.184146","url":null,"abstract":"This study presents a soft synthesis method for producing thin films of SmNiO&lt;span&gt;&lt;span style=\"\"&gt;&lt;/span&gt;&lt;span data-mathml='&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;msub is=\"true\"&gt;&lt;mrow is=\"true\" /&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;3&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;' role=\"presentation\" style=\"font-size: 90%; display: inline-block; position: relative;\" tabindex=\"0\"&gt;&lt;svg aria-hidden=\"true\" focusable=\"false\" height=\"1.509ex\" role=\"img\" style=\"vertical-align: -0.582ex;\" viewbox=\"0 -399.4 453.9 649.8\" width=\"1.054ex\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"&gt;&lt;g fill=\"currentColor\" stroke=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"&gt;&lt;g is=\"true\"&gt;&lt;g is=\"true\"&gt;&lt;/g&gt;&lt;g is=\"true\" transform=\"translate(0,-150)\"&gt;&lt;g is=\"true\"&gt;&lt;use transform=\"scale(0.707)\" xlink:href=\"#MJMAIN-33\"&gt;&lt;/use&gt;&lt;/g&gt;&lt;/g&gt;&lt;/g&gt;&lt;/g&gt;&lt;/svg&gt;&lt;span role=\"presentation\"&gt;&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;msub is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;/mrow&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;3&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt;&lt;/span&gt;&lt;script type=\"math/mml\"&gt;&lt;math&gt;&lt;msub is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;/mrow&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;3&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/script&gt;&lt;/span&gt; with enhanced thermochromic properties after annealing in air. The films were fabricated using magnetron co-sputtering under reactive atmosphere, followed by a lowtemperature annealing process at 550 &lt;span&gt;&lt;span style=\"\"&gt;&lt;/span&gt;&lt;span data-mathml='&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mrow is=\"true\"&gt;&lt;mo is=\"true\"&gt;&amp;#xB0;&lt;/mo&gt;&lt;mi mathvariant=\"normal\" is=\"true\"&gt;C&lt;/mi&gt;&lt;/mrow&gt;&lt;/math&gt;' role=\"presentation\" style=\"font-size: 90%; display: inline-block; position: relative;\" tabindex=\"0\"&gt;&lt;svg aria-hidden=\"true\" focusable=\"false\" height=\"2.086ex\" role=\"img\" style=\"vertical-align: -0.235ex;\" viewbox=\"0 -796.9 1223 898.2\" width=\"2.841ex\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"&gt;&lt;g fill=\"currentColor\" stroke=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"&gt;&lt;g is=\"true\"&gt;&lt;g is=\"true\"&gt;&lt;use xlink:href=\"#MJMAIN-B0\"&gt;&lt;/use&gt;&lt;/g&gt;&lt;g is=\"true\" transform=\"translate(500,0)\"&gt;&lt;use xlink:href=\"#MJMAIN-43\"&gt;&lt;/use&gt;&lt;/g&gt;&lt;/g&gt;&lt;/g&gt;&lt;/svg&gt;&lt;span role=\"presentation\"&gt;&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&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;/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 30 min to crystallize the thermochromic perovskite phase. Structural and chemical analyses, including X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM), confirmed the successful formation of the orthorhombic SmNiO&lt;span&gt;&lt;span style=\"\"&gt;&lt;/span&gt;&lt;span data-mathml='&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;msub is=\"true\"&gt;&lt;mrow is=\"true\" /&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;3&lt;/mn&gt;&lt;/mrow&","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"14 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145229328","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":"Multiscale structural origins of stress annealing tailored magnetic properties in Fe-based nanocrystalline cores","authors":"Jianqiang Zhang ,&nbsp;Yanjun Qin ,&nbsp;Yuxiang Zhao ,&nbsp;Jianzhen An ,&nbsp;Xiangbin Li ,&nbsp;Ke Wang ,&nbsp;Wenqiang Dang ,&nbsp;Xiaqing Zhang ,&nbsp;Xuefu Kang ,&nbsp;Wenbo Gou ,&nbsp;Xiaobin Liu ,&nbsp;Xiaozhen Fan ,&nbsp;Yunzhang Fang","doi":"10.1016/j.jallcom.2025.184231","DOIUrl":"10.1016/j.jallcom.2025.184231","url":null,"abstract":"<div><div>Fe-based nanocrystalline alloys (FNAs) are critical for high-frequency electronics, yet precise magnetic property control remains challenging. Here, a continuous stress annealing (CSA) technique is developed to regulate AC/DC soft magnetic properties of Fe-based nanocrystalline cores (FNCs) via thermomechanical field coupling (TFC). A non-monotonic stress-property relationship is revealed: coercivity (<em>H</em>_c), magnetic anisotropy constant (<em>K</em>), and AC loss (<em>P</em>_s) decrease first and then increase with stress, while permeability (<em>μ</em>_e) exhibits the opposite trend. There exists an optimal state at σ≈ 28.6 MPa, where <em>H</em>_c= 5.4 A/m, <em>μ</em>_e= 6532.5, <em>P</em>_s= 401.2 W/kg (at 300 mT, 200 kHz). To unveil the structural origins, a multiscale characterization approach is employed, integrating atomic force microscopy (AFM), magnetic force microscopy (MFM), <em>in-situ</em> synchrotron radiation X-ray diffraction (SRXRD), and high-resolution transmission electron microscopy (HRTEM). The findings show that low-stress annealing (LSA, σ&lt;28.6 MPa) yields isotropic nanocrystalline distribution and irregular strip-like domains, whereas high-stress annealing (HSA, σ &gt; 28.6 MPa) induces lamellar domains, anisotropic nanocrystalline distribution and lattice distortion, and reduced short-range order (SRO) clusters (from 18.15 vol% to 15.62 vol%). We propose a competitive coupling model where magnetic anisotropy (MA) arises from mesoscopic nanocrystalline distribution (MND), microscopic lattice distortion (MLD), and atomic-scale SRO clusters, and optimal properties at σ≈ 28.6 MPa stem from the synergy of MND and MLD in suppressing atomic-scale SRO clusters. This work establishes a quantitative multiscale framework for designing high-performance soft magnetic materials.</div></div>","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"1043 ","pages":"Article 184231"},"PeriodicalIF":6.3,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145229751","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-Entropy Spinel Oxide (Mn0.5Co0.9Cr0.9Rh0.5Fe0.2)O4 Nanotubes: Cr-Driven Disorder Engineering for Enhanced Oxygen Evolution Reaction","authors":"Yeji Yim, Chae Jung Park, Youngmi Lee, Myung Hwa Kim","doi":"10.1016/j.jallcom.2025.184248","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.184248","url":null,"abstract":"Spinel-structured high-entropy oxides (HESOs) have emerged as remarkable electrocatalysts for oxygen evolution reactions (OER) due to their intrinsic compositional tunability and structural complexity. In this study, spinel-type high-entropy oxide (Mn_0.5Co_0.9Cr_0.9Rh_0.5Fe_0.2)O₄ nanotubes (MCCRF-HEO) were synthesized <em>via</em> simple electrospinning and following calcination process to serve as a superior alkaline OER catalysts. The incorporation of Cr critically promoted the development of a unique nanostructure, where crystalline HESO nanoparticles are uniformly embedded within an amorphous nanotube matrix. The MCCRF-HEO demonstrated excellent electrocatalytic activity for OER in 1.0<!-- --> <!-- -->M KOH, including lower overpotential (303.8<!-- --> <!-- -->mV at 10<!-- --> <!-- -->mA<!-- --> <!-- -->cm⁻²) and smaller Tafel slope (69.6<!-- --> <!-- -->mV dec⁻¹) than commercial Ir-based catalysts. In addition, it exhibited outstanding long-term stability under 24-hour continuous operation under alkaline conditions. The results highlight that the synergistic effects arising from strategic incorporation of heterogenous metal cations facilitate structural disorder and entropy stabilization, thereby optimizing catalytic performance in high-entropy spinel systems.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"20 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145235011","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":"Kinetics evaluation of nanostructured high-entropy material (AlNiCu)0.8(ZnSn)0.2, and its structural, thermal and magnetic properties","authors":"C.M. Hayashi, A.F. Araujo, D.F. Cunha, F.M. André, J.B.R. Neto, A.L.M. Mesquita, G. Primolini, F.L. Faita, D.V.H. Díaz, D.L. Baptista, C.M. Poffo","doi":"10.1016/j.jallcom.2025.184219","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.184219","url":null,"abstract":"A nanostructured high-entropy alloy based on brass and bronze compositions, (AlNiCu)₀.₈(ZnSn)₀.₂, was successfully synthesized via mechanical alloying. The synthesis kinetics were systematically investigated by correlating x-ray diffraction patterns, differential scanning calorimetry curves, and vibrating-sample magnetometry hysteresis profiles. Phase nucleation initiates within the first hour of milling, and thermal analysis indicates that the system stabilizes after four hours of milling. The alloy adopts a P6₃/mmc structure based on the AlCu intermetallic compound (ICSD-57667), with refinement density of 6.894 g/cm³. Nanocrystallites averaging 6.4 nm in size, constitute 55.3% of the microstructure, while the remaining 44.7% represent an interfacial component. Rietveld refinement confirms the structural model, revealing preferential vacancies at the Wyckoff 2d site (⅓, ⅔, ¾), which introduces occupation asymmetry to the structure. Thermally, the alloy exhibits a specific heat (<em>C</em>_<em>p</em> = 0.4398 J/gK) consistent with the rule of mixtures and a thermal diffusivity (α = 5.46 mm²/s). Notably, thermal diffusivity oscilates with milling stages reflecting competing mechanisms. The derived thermal conductivity (<em>K</em> = 16.94 W/mK) aligns with other high-entropy alloys. Magnetically, the material displays semihard behavior (<em>H</em>_<em>c</em> = 234.81 Oe), with low specific saturation magnetization (σ = 0.59 emu/g) and remanence (<em>b</em> = 0.13 emu/g).","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"51 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145235066","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}