The Properties of Reduced Ge-Sb-O Glasses for Thermoelectric Devices

Abstract

The structural and electrical properties of germanium-antimonate glasses after heat treatment in hydrogen have been determined. In the case of 50GeO 2 -50Sb 2 O 3 glass reduced at 340°C even for less than 1 hour a continuous layer of antimony granules is formed and its electrical properties determine the surface conductivity of the reduced sample. The bulk electrical conductivity at 100°C of this sample was determined as 1000 Scm -1 and the Seebeck coefficient at this temperature in reference to Pt was found to be α=(17.2 0.5) μVK -1 .

Structure and thermoelectric properties of Bi–Te alloys obtained by novel method of oxide substrates reduction

“…If a certain critical grain concentration is achieved, the electron tunneling between the grains becomes possible. Bi-Si-K-O [19], Bi-Ge-K [19], Ge-Sb [28]. They have shown that for all of these oxide glasses a very similar process takes place.…”

Structure and Thermoelectric Properties of Te-Ag-Ge-Sb (TAGS) Materials Obtained by Reduction of Melted Oxide Substrates

“…Kusz and his group examined the formation of both pure metal grains or a composite of metal alloy and amorphous oxide during heat treatment at 340°C to 400°C in hydrogen atmosphere for various oxide glasses, e.g., Bi-Si-K-O, 21 Bi-Ge-K-O, 21 Bi-Si-O, 22,23 Bi-Ge-O, [24][25][26][27][28] Pb-Ge-O, 29 and Ge-Sb-O. 30 They have shown that the structure and physical properties of the reduced oxides depend strongly on temperature and the duration of reduction. The reduction process of Bi 3+ and Ge 4+ ions in hydrogen atmosphere in the temperature range of 320°C to 400°C leads to the formation of neutral Bi 0 and Ge 0 atoms.…”