Features of sintering process of Ni(M)Sn (M=Ti, Zr, Hf) heusler alloys

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 Ni0.33(Ti0.23Zr0.44Hf0.43)0.33Sn0.33 and Ni0.33(Ti0.5Zr0.5)0.33(Sn0.99Sb0.01)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 nanostructuredmaterial by rapid hot pressing is described; synthesis parameters are presented. The thermal diffusivities of consolidated samples are measured.