National University of Science and Technology MISiS

V. T. Bublik

N. Yu. Tabachkova

Giredmet

I. A. Drabkin

V. V. Karataev

M. G. Lavrentev

V. B. Osvensky

Yu. N. Parkhomenko

A. I. Sorokin

Technical Institute for Ultrahard and New Carbon Materials

G. I. Pivovarov

Bulk nanostructured Bi_xSb_1−xTe₃ based material was fabricated with spark plasma sintering (SPS) method. The starting powders with a particle size of 10—12 nm were prepared by ball milling. The regularity of fine structure changes as a function of sintering temperature in the 250—550 °C range was investigated by X−ray diffractometry, scanning and transmission electron microscopy (TEM, HRTEM). For the first time coherent dispersion areas (CDA) size was found not to increase monotonously with sintering temperature, and at temperatures of above 400 °C the CDA size decreased as a result of repeated recrystallization. Apparently, the structural changes are associated with a redistribution of intrinsic vacancy type structural defects during sintering.

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