S. ADAM¹, M. I. PETRESCU^1,*

Abstract

Experimental determination of the thermoelectric power has been carried out in liquid Tl-S alloys containing various excess of sulfur compared to the stoichiometric composition of the semiconductor Tl2S compound. In order to investigate the behavior of the liquid alloys in the pre-freezing range, experiments on the thermoelectric power have been performed in the low temperature range in the melt (maximum 110 K overheating, minimum 10 K overheating above the liquidus temperature). Spectral pure elements Tl and S have been used for preparing the alloys. An experimental device assuring that the thermocouples reflect accurately the temperature of the Mo electrodes and precise measurement of the thermoelectric power by a compensation method have been used. Two alloys containing 2% and 9.6% excess sulfur, respectively, have exhibited parallel curves showing a monotonous decrease of the Seebeck coefficient in the melt as the temperature increased above the liquidus point. A superposition of the two curves was obtained when the Seebeck coefficient was plotted against the degree of overheating of the melt. Theoretical calculation of the energy of activation has resulted in similar values, namely 0.8 eV at 2 at% excess sulfur and 0.65 eV at 9.6 at% excess sulfur, respectively..

Keywords

thermoelectric power, liquid Tl-S alloys, pre-freezing range, activation energy.

Submitted at: April 30, 2013
Accepted at: Sept. 18, 2013

Citation

S. ADAM, M. I. PETRESCU, Thermoelectric power in two liquid Tl-S alloys (64.7 at.%Tl and 57.1 at.%Tl) in the low temperature range down to the liquidus point, Journal of Optoelectronics and Advanced Materials Vol. 15, Iss. 9-10, pp. 995-1002 (2013)

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