Low lattice thermal conductivity suppressed by Sr-deficiency in Sr 0.9Ca0.1Si2

C. S. Lue, Y. S. Tseng, J. Y. Huang, H. L. Hsieh, H. Y. Liao, Y. K. Kuo

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6 Citations (Scopus)

Abstract

We present a study of the temperature-dependent electrical resistivity, Seebeck coefficient, and thermal conductivity in Sr0.9-δCa 0.1Si2 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 Sr0.9Ca 0.1Si2. In particular, a marked low lattice thermal conductivity of about 1.1 W/m-K at room temperature is achieved for Sr 0.77Ca0.1Si2. 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.

Original languageEnglish
Article number072132
JournalAIP Advances
Volume3
Issue number7
DOIs
Publication statusPublished - 2013 Aug 26

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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