The objects of study are nanostructured thermoelectric materials for efficient conversion of excess heat to electric power. The materials under study are half-Heusler alloys based on Ni(M)Sn, where M =Ti, Hf, Zr in various ratios. The results of preparation of nanoscale powders of Ni 0.33 (Ti 0.23 Zr 0.44 Hf 0.43 ) 0.33 Sn 0.33 and Ni 0.33 (Ti 0.5 Zr 0.5 ) 0.33 (Sn 0.99 Sb 0.01 ) 0.33 compositions are presented.Their structure and size characteristics are studied by electron microscopy and laser diffraction. The process of powder sintering into a bulk nanostructured material by rapid hot pressing is described; synthesis parameters are presented. The thermal diffusivities of consolidated samples are measured.
The paper devotes a new general experimental method for studying the anisotropy of conducting materials of various functional purposes. The difference between the presented method and the previously known one is in the high rate of anisotropy assessment, ensuring the possibility of anisotropy assessment of the properties of materials by the volume of the sample or product under investigation during their manufacture or operation. The procedure for measuring the anisotropy of electrophysical properties and the results of the study of some samples are presented.
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