Low lattice thermal conductivity suppressed by Sr-deficiency in Sr0.9Ca0.1Si2

We present a study of the temperature-dependent electrical resistivity, Seebeck coefficient, and thermal conductivity in Sr0.9-δCa0.1Si2 alloys to shed light on Sr-deficient effect on the thermoelectric performance, as characterized by the dimensionless thermoelectric figure-of-merit, ZT. It is foun...

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Published inAIP advances Vol. 3; no. 7; p. 072132
Main Authors Lue, C. S., Tseng, Y. S., Huang, J. Y., Hsieh, H. L., Liao, H. Y., Kuo, Y. K.
Format Journal Article
LanguageEnglish
Published AIP Publishing LLC 01.07.2013
Subjects
Alloys
Electrical resistivity
Extrapolation
Heat transfer
Lattices
Strontium
Thermal conductivity
Thermoelectricity
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Summary:We present a study of the temperature-dependent electrical resistivity, Seebeck coefficient, and thermal conductivity in Sr0.9-δCa0.1Si2 alloys to shed light on Sr-deficient effect on the thermoelectric performance, as characterized by the dimensionless thermoelectric figure-of-merit, ZT. It is found that the thermal conductivity is considerably reduced upon introducing Sr deficiency in Sr0.9Ca0.1Si2. In particular, a marked low lattice thermal conductivity of about 1.1 W/m-K at room temperature is achieved for Sr0.77Ca0.1Si2. Such a promising result leads to a relatively high ZT of 0.27 at room temperature for this material. Furthermore, with the extrapolation of thermoelectric parameters to high temperatures, a possible maximum ZT of about 0.52 at 850 K can be realistically estimated for Sr0.77Ca0.1Si2.
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ISSN:2158-3226
2158-3226
DOI:10.1063/1.4817576