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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Emergent properties in the natural composite Ni2MnSb0.5Al0.5
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Emergent properties in the natural composite Ni2MnSb0.5Al0.5

机译：自然复合材料NI2MNSB0.5AL0.5中的紧急性质

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摘要

We have investigated the structure, transport and magnetic properties of Ni2MnSb0.5Al0.5 Heusler alloy. Structural analysis using x-ray diffraction and scanning electron microscopy has confirmed Ni2MnSb0.5Al0.5 to be a natural composite of Ni2MnSb and Ni2MnAl phases, regardless of annealing conditions. This composite has a dendritic microstructure formed by the phase separation during solidification. The electronic phase separation was confirmed using x-ray near edge absorption spectroscopy, recorded at Mn and Ni K-edge and supported by ab-initio calculations of the same using multiple scattering theory. A thorough characterization of this novel composite form of Ni2MnSb0.5Al0.5 Heusler alloy has been carried out by recording its magnetic and transport properties including electrical resistivity, thermal conductivity, and heat capacity. The composite micro-structure of this system plays a crucial role in drastically reducing its thermal conductivity value, while maintaining its metallic character. Unlike many oxide composites, the magnetic properties of the Ni2MnSb0.5Al0.5 cannot be considered as the volume average of the characteristics of the two phases, rather it shows a long range ferromagnetic order with Curie temperature of 334 K and magnetic moment of 2.52 mu B
机译：我们研究了Ni2mnsb0.5Al0.5 Heusler合金的结构，运输和磁性。无论退火条件如何，使用X射线衍射和扫描电子显微镜通过X射线衍射和扫描电子显微镜的结构分析证实了Ni2MNSB0.5A10.5。该复合材料具有通过在凝固过程中分离形成的树突式微观结构。使用X射线附近的边缘吸收光谱进行确认电子相分离，记录在Mn和Ni k边缘，并由使用多个散射理论的AB-Initio计算支持。通过记录其磁性和运输性能，包括电阻率，导热性和热容量，对这种新型复合形式的Ni2MNSB0.5Al0.5的全新复合形式的彻底表征已经进行。该系统的复合微结构在大大降低其导热率值时起着至关重要的作用，同时保持其金属特征。与许多氧化物复合材料不同，Ni2MNSB0.5Al0.5的磁性不能被认为是两相的特性的体积平均值，而是表示具有334 k和2.52μm的磁矩的长范围的铁磁性阶。 B

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