Journal of Alloys and Compounds最新文献_第10页

The enhancement of photoelectric conversion by MXene hot electron injection: Synthesis, interface control, and ultrafast kinetic observation MXene热电子注入增强光电转换：合成、界面控制和超快动力学观察

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds

Pub Date : 2026-01-13 DOI: 10.1016/j.jallcom.2026.186186

Lingling Chu , Chao Xu , Shoujin Zhu , Weibing Wu , Ranyun Wu , Shaohua Liu , Songlin Zhou

The use of localized surface plasmon resonance effect to induce hot electron injection and enhance the photoelectric conversion efficiency of two-dimensional transition metal carbon/nitride (MXene) based photodetectors can break through the traditional bandgap limitation. MXene is an ideal hot carrier material due to its metal like properties, controllable surface chemistry, and wide spectral response. The material synthesis has evolved from hydrofluoric acid (HF) etching to green strategies such as Joule heating and Lewis acid molten salt etching, achieving precise control of surface functional groups and defect density. Interface engineering can adjust the work function to 4.55–5.25 eV through LiF, PEIE, and proton acid treatment, effectively reducing the Schottky barrier of MXene/semiconductor heterojunction, resulting in a rectification ratio of up to 16136 and a UV responsivity of 81.3 A·W⁻¹ . At the same time, the balance mechanism of surface termination groups on charge transfer efficiency, dark current suppression, and stability is elucidated. By combining femtosecond pump probe spectroscopy with first principles simulations, the thermal electron dynamics mechanism was revealed, revealing the 50 fs ultrafast electron transfer and interface electron nucleus coupling energy transfer path. Despite facing challenges such as theoretical experimental bias, interface defect control, environmental stability, and scaling costs, this review provides theoretical guidance and experimental strategies for the new generation of ultrafast photodetectors and energy conversion systems by integrating material synthesis, interface regulation, and ultrafast dynamics research results.

利用局域表面等离子体共振效应诱导热电子注入，提高二维过渡金属碳/氮化物（MXene）光电探测器的光电转换效率，可以突破传统的带隙限制。MXene是一种理想的热载流子材料，因为它具有类似金属的性质，可控的表面化学，和宽的光谱响应。材料合成从氢氟酸（HF）蚀刻发展到焦耳加热和刘易斯酸熔盐蚀刻等绿色策略，实现了对表面官能团和缺陷密度的精确控制。界面工程可以通过LiF、PEIE和质子酸处理将功函数调整到4.55-5.25 eV，有效地降低了MXene/半导体异质结的肖特基势垒，使得整流比高达16136，紫外响应度为81.3 a·W⁻¹ 。同时，阐明了表面终止基对电荷转移效率、暗电流抑制和稳定性的平衡机制。通过飞秒泵浦探测光谱与第一性原理模拟相结合，揭示了热电子动力学机制，揭示了50 fs超快电子转移和界面电子核耦合能量转移路径。尽管面临着理论实验偏差、界面缺陷控制、环境稳定性和标度成本等挑战，但本文通过整合材料合成、界面调节和超快动力学研究成果，为新一代超快光电探测器和能量转换系统提供了理论指导和实验策略。

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引用次数: 0

Photoluminescence properties of HfO2:RE3+ (RE = Eu, Sm, Tb, Dy) coatings formed by plasma electrolytic oxidation of hafnium in an electrolyte containing RE oxide particles 在含稀土氧化物颗粒的电解液中等离子体电解氧化铪形成的HfO2:RE3+ (RE = Eu, Sm, Tb, Dy)涂层的光致发光性能

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds

Pub Date : 2026-01-13 DOI: 10.1016/j.jallcom.2026.186205

Stevan Stojadinović , Aleksandar Ćirić

This study investigates the morphology, composition, and photoluminescence (PL) properties of HfO₂ coatings formed on hafnium by plasma electrolytic oxidation (PEO), with the addition of rare-earth (RE) oxide particles (Eu₂O₃, Sm₂O₃, Dy₂O₃, and Tb₄O₇) at various concentrations. The PEO coatings exhibited a characteristic microstructure with micropores and solidified molten oxide domains. EDS analysis confirmed the successful incorporation of RE elements from the electrolyte into the HfO₂ layer, with the concentration of RE elements in the coating increasing as their concentration in the electrolyte increased. XRD showed that the pure HfO₂ coating was exclusively monoclinic. Incorporation of RE³⁺ induced a phase transformation, stabilizing the tetragonal HfO₂ at the expense of the monoclinic phase. The HfO₂:RE³⁺ coatings displayed intense, characteristic PL emissions corresponding to the RE³⁺ intra-configurational 4f-4f transitions. Excitation occurs through both direct RE³⁺ 4f-4f transitions and a highly efficient charge transfer (CT) process from O²⁻ to RE³⁺ (RE = Eu, Sm, Dy) and the 4f⁸ → 4f⁷5d¹ transition of Tb³⁺. Analysis of the asymmetric ratio (R) for Eu³⁺ and Sm³⁺, as well as the yellow/blue (Y/B) ratio for Dy³⁺ and green/blue (G/B) ratio for Tb³⁺, confirmed that the RE³⁺ ions occupy low-symmetry (non-centrosymmetric) sites in the monoclinic HfO₂ phase, which is responsible for the highly efficient PL emission. The slight decrease in these R and Y/B values, as well as the increase in G/B values with increasing RE concentrations in HfO₂ coatings, is related to the stabilization of the higher-symmetry tetragonal phase. This work demonstrates an effective PEO method to produce advanced RE-doped HfO₂ phosphors on hafnium substrates with tunable crystalline phases and strong PL properties.

本研究研究了等离子体电解氧化（PEO）在不同浓度的稀土（RE）氧化物颗粒（Eu2O3、Sm2O3、Dy2O3和Tb4O7）的加入下，在铪表面形成的HfO2涂层的形貌、组成和光致发光（PL）性能。PEO涂层的微观结构具有微孔和凝固的熔融氧化物结构。EDS分析证实了稀土元素从电解液中成功掺入HfO2层，随着稀土元素在电解液中浓度的增加，稀土元素在涂层中的浓度也随之增加。XRD表明，纯HfO2涂层完全是单斜的。RE3+的加入诱导了相变，以单斜相为代价稳定了四边形的HfO2。HfO2:RE3+涂层显示出与RE3+构型内4f-4f跃迁相对应的强烈的特征性PL发射。激发通过RE3+ 4f-4f的直接跃迁和O2−到RE3+ (RE = Eu, Sm, Dy)的高效电荷转移（CT）过程以及Tb3+的4f8→4f75d1跃迁发生。分析了Eu3+和Sm3+的不对称比(R)，以及Dy3+的黄/蓝（Y/B）比和Tb3+的绿/蓝（G/B）比，证实了RE3+离子在单斜相HfO2中占据低对称（非中心对称）的位置，这是高效PL发射的原因。随着稀土浓度的增加，HfO2涂层中R /B值和Y/B值略有下降，而G/B值则有所增加，这与高对称性四方相的稳定有关。这项工作证明了一种有效的PEO方法，可以在具有可调谐晶相和强PL性能的铪衬底上生产先进的re掺杂HfO2荧光粉。

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引用次数: 0

Harmonious bandgap narrowing and surface area increase in ultrathin carbon nitride nanosheets by carbon doping for boosting photocatalytic antibiotic removal 碳掺杂提高超薄氮化碳纳米片的和谐带隙和表面积，促进光催化抗生素去除

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds

Pub Date : 2026-01-13 DOI: 10.1016/j.jallcom.2026.186187

Wenwen Liu , Zhuo Zhu , Renfu Peng , Fang Xie , Xiaoming Zhang

Graphitic carbon nitride (CN) has evolved as a prospective photocatalyst for the degradation of antibiotics. However, the photocatalytic activity is hindered by its limited visible light absorption, rapid charge recombination, and a small surface area. Herein, ultrathin carbon-doped CN nanosheets (CCNS) were synthesized by copolymerizing melamine and 2,4,6-triaminopyrimidine followed by thermal exfoliation. Characterization results suggest that the synthesized CCNS achieves a narrowed bandgap of 2.52 eV and a high specific surface area of 217.93 m² g^–1, significantly outperforming pristine bulk CN and mitigating the typically inconsistent relationship between light absorption and surface area in exfoliated CN nanosheets due to the quantum confinement effect. Concomitantly, CCNS exhibit markedly enhanced charge separation efficiency. Furthermore, the optimized band structure exhibits a more negative conduction band position, which is thermodynamically more favorable for molecular oxygen activation and the generation of superoxide radicals. Consequently, CCNS demonstrates significantly boosted activity in removing tetracycline hydrochloride and levofloxacin under visible light with degradation rate constants 18.43 and 11.59 times higher than those observed with pristine bulk CN, respectively. Additionally, CCNS shows modest tolerance to inorganic ions and tetracycline hydrochloride removal in natural waters. The work presents an effective synergistic approach that combines carbon doping with morphology engineering to overcome immanent multiple limitations in CN based photocatalysts for antibiotic removal.

氮化石墨碳（CN）是一种很有前途的降解抗生素的光催化剂。然而，由于其可见光吸收有限、电荷重组快、表面积小等因素，其光催化活性受到阻碍。本文采用三聚氰胺与2,4,6-三氨基嘧啶共聚，热剥离法制备了超薄碳掺杂CN纳米片（CCNS）。表征结果表明，合成的CCNS实现了2.52 eV的窄带隙和217.93 m2 g-1的高比表面积，显著优于原始体CN，并缓解了由于量子限制效应而导致的剥脱CN纳米片光吸收与表面积之间的不一致关系。同时，CCNS表现出明显增强的电荷分离效率。此外，优化后的能带结构呈现出更负的传导带位置，这在热力学上更有利于分子氧的活化和超氧自由基的生成。结果表明，CCNS在可见光下对盐酸四环素和左氧氟沙星的降解活性显著提高，降解速率常数分别是原始体CN的18.43倍和11.59倍。此外，CCNS对天然水体中无机离子和盐酸四环素的去除表现出适度的耐受性。这项工作提出了一种有效的协同方法，将碳掺杂与形态工程相结合，克服了CN基光催化剂去除抗生素的内在多重限制。

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引用次数: 0

Tailoring Schottky junctions and surface defects in Au-decorated CuO for selective room-temperature NO2 detection 在选择性的室温NO2检测中裁剪au修饰CuO中的肖特基结和表面缺陷

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds

Pub Date : 2026-01-13 DOI: 10.1016/j.jallcom.2026.186182

Jimyeong Park , Ok Sung Jeon , Jiyeon Shin , Jae-Hyoung Lee , Minseo Kim , Jae-Hun Kim , Changhyun Jin , Myung Sik Choi

Au-decorated CuO nanocomposite samples were synthesized using two consecutive hydrothermal processes. Appropriate Au nanoparticle loading induced oxygen vacancies and facilitated Schottky junction formation on the CuO nanowire surface. The optimized nanocomposite was subsequently tested as a room-temperature gas sensor for NO₂ gas, exhibiting high selectivity and thus overcoming a significant limitation of other gas sensors based on metal oxide semiconductors. It was also found that the number of surface defects decreased at higher fabrication temperatures, while ohmic junctions were formed at higher Au loadings, weakening the gas-sensing performance of the resulting nanocomposite. Overall, this study presents a promising fabrication method that has the potential to be employed with a range of other materials for gas-sensing applications.

采用连续两次水热法制备了au修饰的CuO纳米复合材料样品。适当的Au纳米粒子负载诱导氧空位，促进了CuO纳米线表面Schottky结的形成。优化后的纳米复合材料随后作为NO2气体的室温气体传感器进行了测试，显示出高选择性，从而克服了其他基于金属氧化物半导体的气体传感器的显着局限性。研究还发现，在较高的制造温度下，表面缺陷的数量减少，而在较高的Au负载下形成欧姆结，从而削弱了所得到的纳米复合材料的气敏性能。总的来说，这项研究提出了一种有前途的制造方法，有可能与一系列其他材料一起用于气敏应用。

引用次数: 0

The influence of supersonic fine particle bombardment times and graphene layer number on the synergistic strengthening effect of TiAl alloy 超声速细颗粒轰击次数和石墨烯层数对TiAl合金协同强化效果的影响

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds

Pub Date : 2026-01-13 DOI: 10.1016/j.jallcom.2026.186161

Xingyou Ding , Hui Cao , Wenke Chen , Ziqi Lu , Baocheng Zhou , Ruicheng Feng

To overcome the performance limitations of single strengthening methods, this study employed molecular dynamics simulation to establish a model of the synergistic strengthening of TiAl alloy by supersonic fine particle bombardment and graphene. The study systematically investigated the synergistic effects of bombardment times and graphene layer number on the microstructure and mechanical properties of the material. The results indicated that the synergistic strengthening effect originated from the coupling of dislocations and interfaces, but the dominant mechanisms were different. Graphene layer number dominated the tensile properties, and its increase enhanced the tensile strength and elastic modulus by up to 17.2 % and 5.3 %, respectively, through interfacial stress transfer and promotion of twinning deformation. Twinning followed the classical path of ISF→ESF→TB. Bombardment times dominated the indentation properties, and the residual dislocation network introduced by bombardment dynamically regulated subsequent plastic deformation, particularly promoting the evolution of V-shaped dislocations, which increased the nanoindentation hardness by 12.4 % under the optimal process of two bombardments. Extreme difference analysis quantitatively confirmed that graphene layer number and bombardment times were the main control factors for regulating the tensile strength and indentation hardness of the material, respectively. This study clarified the cross-scale synergistic strengthening mechanism of surface treatment and bulk reinforcement at the atomic scale, providing a solid theoretical basis for the design of high-performance TiAl alloy composites as required.

为了克服单一强化方法的性能局限性，本研究采用分子动力学模拟方法建立了超声细颗粒轰击与石墨烯协同强化TiAl合金的模型。系统研究了轰击次数和石墨烯层数对材料微观结构和力学性能的协同效应。结果表明，协同强化效应来源于位错和界面的耦合作用，但主导机制不同。石墨烯层数对拉伸性能起主导作用，石墨烯层数的增加通过界面应力传递和促进孪晶变形，使拉伸强度和弹性模量分别提高了17.2% %和5.3% %。双胞胎遵循经典的ISF→ESF→TB的路径。轰击次数对压痕性能起主导作用，轰击引入的残余位错网络动态调节后续塑性变形，特别是促进v形位错的演化，在两次轰击的优化工艺下，纳米压痕硬度提高了12.4 %。极差分析定量证实了石墨烯层数和轰击次数分别是调节材料抗拉强度和压痕硬度的主要控制因素。本研究明确了表面处理与体增强在原子尺度上的跨尺度协同强化机理，为设计高性能TiAl合金复合材料提供了坚实的理论依据。

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引用次数: 0

Multi-objective optimization and performance of copper-steel composite sheets fabricated by FSAM using a hybrid entropy weight TOPSIS-RSM approach 基于混合熵权TOPSIS-RSM方法的FSAM铜钢复合薄板多目标优化及性能研究

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds

Pub Date : 2026-01-13 DOI: 10.1016/j.jallcom.2026.186194

Jindou Chen , Huijun Liang , Peipei Li , Chaoyang Sun , Chengyue Xiong , Lingyun Qian

The steel-copper (St-Cu) composite plate represents a critical candidate material for plasma-facing components in the International Thermonuclear Experimental Reactor (ITER). However, achieving robust interfacial bonding remains a significant challenge due to the solid-state immiscibility between Cu and St, which severely impedes their high-performance manufacturing. In this study, a pure copper layer was successfully deposited onto a 316L stainless steel substrate using friction stir additive manufacturing (FSAM). To systematically address the multi-objective performance trade-offs (ultimate tensile strength (UTS), shear load, elongation) and enhance process robustness in this complex dissimilar-material FSAM process, a hybrid optimization framework integrating entropy-weighted TOPSIS with response surface methodology (RSM) was implemented in the study for the first time. Microstructural characterization revealed the formation of a continuous and dense metallurgical bonding zone, along with mechanical interlocking at the interface. Meanwhile, dynamic recrystallization led to significant grain refinement in the stir zone, resulting in a peak microhardness of 345 HV on the steel side. Under the optimized parameters, the composite plate exhibited outstanding comprehensive mechanical properties, reaching a UTS of 618.7 MPa, a peak shear load of 6.31 kN, and an elongation of 36.4 %. These values notably surpass those previously reported for FSAM-fabricated composites in the literature. Furthermore, the established optimization model enabled the quantitative identification of a robust processing window, precisely mapped as an elliptical domain with a revolution speed of 600–640 rpm and a traverse speed of 48–58 mm/min. This study provides direct theoretical and parametric guidance for the reliable large-scale manufacturing of St-Cu composite plates.

钢-铜（St-Cu）复合材料是国际热核实验反应堆（ITER）等离子体面组件的关键候选材料。然而，由于Cu和St之间的固态不混溶性，实现坚固的界面键合仍然是一个重大挑战，这严重阻碍了它们的高性能制造。在这项研究中，使用搅拌摩擦增材制造（FSAM）成功地将纯铜层沉积在316L不锈钢衬底上。为了系统地解决这个复杂的不同材料FSAM过程中的多目标性能权衡（极限抗拉强度（UTS），剪切载荷，伸长率）并增强过程鲁棒性，研究中首次实施了一个将熵加权TOPSIS与响应面法（RSM）相结合的混合优化框架。显微组织表征表明，形成了连续致密的冶金结合区，并在界面处形成了机械联锁。同时，动态再结晶导致搅拌区晶粒明显细化，钢侧显微硬度峰值为345 HV。在优化后的参数下，复合材料的综合力学性能达到了618.7 MPa，峰值剪切载荷为6.31 kN，伸长率为36.4 %。这些值明显超过了先前在文献中报道的fsam制造的复合材料。此外，所建立的优化模型能够定量识别稳健的加工窗口，精确地映射为椭圆域，转速为600-640 rpm，横移速度为48-58 mm/min。该研究为St-Cu复合材料板的可靠大规模制造提供了直接的理论和参数指导。

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引用次数: 0

Simultaneous improvement of strength and ductility in bimodally grained Mg-Y-Al alloys via anisotropic mechanical property-induced ductilization mechanism assisted by LPSO nanoplate precipitation LPSO纳米板沉淀辅助各向异性力学性能诱导的双晶Mg-Y-Al合金强度和塑性的同时提高

IF 6.2 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds

Pub Date : 2026-01-13 DOI: 10.1016/j.jallcom.2026.186188

ShengXiong Tang, Nayu Yoshida, Tsuyoshi Mayama, Koji Hagihara, Soya Nishimoto, Michiaki Yamasaki

引用次数: 0

The effect of hot rolling temperature on the interface characteristics and properties of Al/Mg/Al composite plates 热轧温度对Al/Mg/Al复合材料界面特性和性能的影响

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds

Pub Date : 2026-01-13 DOI: 10.1016/j.jallcom.2026.186184

Xiao Lv , Pengcheng Xia , Haitao Bai , Meiqing Cao , Kun Xie , Hong Yan

The 1060/AZ91/1060 composite plates were prepared by rolling process with the rolling temperatures of 360 ℃, 400 ℃, 440 ℃ and 480 ℃ in order to investigate the effect of hot rolling temperatures on the interfacial bonding strength and mechanical properties of composite plates. The interface characteristics and mechanical properties of Al/Mg/Al composite plates were studied by optical microscopy (OM), scanning electron microscopy (SEM), electron backscatter diffraction (EBSD) and tensile and shear tests. The results show that the magnesium alloy exhibits a typical rolled microstructure. There are recrystallized grains and twins in the AZ91 alloy layer of composite plates. The element diffusion occurs in the Mg/Al interface of the composite plate. The distance of mutual diffusion between magnesium and aluminum atoms continues to increase with rising rolling temperature, which results in an increase in the bonding strength of Mg/Al interface in the composite plate. The grain size of the Mg alloy increases, the number of substructures increases, and the proportion of recrystallized and deformed grains decrease with the rise of rolling temperature. The tensile strength of the composite plate decreases and the elongation rate increases with the increase of rolling temperatures. The Al/Mg/Al composite plates exhibit excellent corrosion resistance.

采用轧制温度为360℃、400℃、440℃和480℃的方法制备了1060/AZ91/1060复合板材，研究了热轧温度对复合板材界面结合强度和力学性能的影响。采用光学显微镜（OM）、扫描电镜（SEM）、电子背散射衍射（EBSD）以及拉伸和剪切试验研究了Al/Mg/Al复合材料的界面特征和力学性能。结果表明，镁合金表现出典型的轧制组织。复合板材中AZ91合金层存在再结晶晶粒和孪晶。元素扩散发生在复合板的Mg/Al界面。随着轧制温度的升高，镁和铝原子之间的相互扩散距离不断增加，导致复合板材中Mg/Al界面的结合强度增加。随着轧制温度的升高，镁合金的晶粒尺寸增大，亚组织数量增多，再结晶和变形晶粒比例降低。随着轧制温度的升高，复合板材的抗拉强度降低，伸长率提高。Al/Mg/Al复合材料板具有优异的耐腐蚀性。

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引用次数: 0

Strength-ductility synergism in NbTiVZr refractory high-entropy alloy driven by lattice distortion-induced electronic structure regulation 晶格畸变诱导的电子结构调控驱动下NbTiVZr难熔高熵合金的强度-塑性协同作用

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds

Pub Date : 2026-01-13 DOI: 10.1016/j.jallcom.2026.186190

Ning Ding , Zeyun Cai , Bohua Yu , Chi Zhang , Huaijin Wang , Jie Chen , Tao Hong , Chaoran Wang , Weizong Bao , Guoqiang Xie

Refractory high-entropy alloys (RHEAs) exhibit significant potential for aerospace applications owing to their exceptional stability at elevated temperatures. However, the challenge of achieving density-strength-ductility synergy presents a major obstacle to engineering implementation. In this study, a strength-ductility balance is achieved through severe lattice distortion in the NbTiVZr system, which involves a larger-sized atom (Zr) and a smaller-sized atom (V). The calculated results confirm that NbTiVZr exhibits pronounced lattice distortion, which is the dominant strengthening mechanism. The localized stress fields induced by the distortion, coupled with enhanced d-orbital hybridization, significantly increase atomic bonding strength. Electronic structure analysis demonstrates that distortion promotes charge density rearrangement and transfer, further strengthening interatomic bonds. Lattice distortion also facilitates the nucleation and migration of kink bands, thereby effectively delaying crack initiation and maintaining ductility. Driven by lattice distortion, the NbTiVZr exhibits a yield strength of 1132 MPa, an elongation of 11 %, and a density of 6.47 g/cm³, achieving an exceptional balance among these three properties. This work provides a theoretical foundation for understanding how lattice distortion governs mechanical properties, offering insights for the design of low-density, high-performance RHEAs.

耐火高熵合金（RHEAs）由于其在高温下的优异稳定性，在航空航天应用中表现出巨大的潜力。然而，实现密度-强度-延性协同的挑战是工程实施的主要障碍。在本研究中，通过NbTiVZr体系中较大尺寸原子（Zr）和较小尺寸原子(V)的严重晶格畸变实现了强度-延性平衡。计算结果证实，NbTiVZr表现出明显的晶格畸变，这是主要的强化机制。畸变引起的局部应力场，加上d轨道杂化的增强，显著提高了原子的键合强度。电子结构分析表明，扭曲促进电荷密度重排和转移，进一步加强原子间键。晶格畸变也有利于扭结带的形核和迁移，从而有效地延缓裂纹的萌生和保持延性。在晶格畸变的驱动下，NbTiVZr的屈服强度为1132 MPa，伸长率为11%，密度为6.47 g/cm3，在这三个性能之间实现了良好的平衡。这项工作为理解晶格畸变如何控制机械性能提供了理论基础，为低密度，高性能rhea的设计提供了见解。

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引用次数: 0

Evolution of ferromagnetism in nanocrystalline La0.7Sr1.3MnO4 纳米晶La0.7Sr1.3MnO4的铁磁性演化

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds

Pub Date : 2026-01-13 DOI: 10.1016/j.jallcom.2026.186196

Mukesh Verma , P.D. Babu , Yugandhar Bitla

The structural, magnetic and magnetocaloric properties of the nanocrystalline

{La}_{0.7} {Sr}_{1.3} {MnO}_{4}

compound, monolayer analog of colossal magnetoresistive

{La}_{0.7} {Sr}_{0.3} {MnO}_{3}

manganite, are investigated. The compound retains the tetragonal crystal structure (I4/mmm) of the bulk confirming a quasi-two-dimensional structure with reduced inter-

{MnO}_{2}

layer separation. The compound reveals competing ferromagnetic and antiferromagnetic interactions, and a ferromagnetic to paramagnetic transition at

\approx 329

K as opposed to spin-glass behavior in the bulk. Short-range antiferromagnetic correlations in the paramagnetic region are observed. This work indicates that the reduced crystallite size can be used to tune the magnetic ground state in the monolayer manganites.

研究了La0.7Sr1.3MnO4La0.7Sr1.3MnO4纳米晶化合物la0.7 sr1.3 mno4的结构、磁性和磁热性能，并与La0.7Sr0.3MnO3La0.7Sr0.3MnO3锰矿石单层相似。该化合物保留了块体的四方晶体结构（I4/mmm），证实了准二维结构，减少了mno2mno2间的分离。形成了一个准二维结构。该化合物显示出铁磁和反铁磁相互作用的竞争，并且在≈329≈329 K时，通过减少MnO2MnO2单层之间的距离，显示出铁磁到顺磁的转变，而不是体中的自旋玻璃行为。在顺磁区观察到短程反铁磁相关。这项工作表明，晶粒尺寸的减小可以用来调整单层锰的磁性基态。

引用次数: 0