Features of microstructure and thermoelectric properties of the cermet composites based on grained Bi₂Te₃ matrix with locally-gradient Ni@NiTe₂ inclusions

Abstract

Starting and Ni powders were spark-plasma-sintered (SPS) to prepare thermoelectric cermet composites consisting of thermoelectric Bi₂Te₃ matrix with different content, x, of ferromagnetic Ni filler (x = 0.00, 0.50, 0.85, 1.25 and 1.50 at. %). Grained Bi2Te3 matrix of composites is texturing under sintering. Texturing degree is x-dependent that is attributed to ability of Ni particles act as lubricant