Open AccessLow lattice thermal conductivity suppressed by Sr-deficiency in Sr0.9Ca0.1Si2
Author(s) -
C. S. Lue,
YenShung Tseng,
J. Y. Huang,
H. L. Hsieh,
Haibin Liao,
Y. K. Kuo
Publication year - 2013
Publication title -
aip advances
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.421
H-Index - 58
ISSN - 2158-3226
DOI - 10.1063/1.4817576
Subject(s) - thermal conductivity , seebeck coefficient , materials science , thermoelectric effect , electrical resistivity and conductivity , condensed matter physics , thermoelectric materials , extrapolation , dimensionless quantity , figure of merit , thermodynamics , composite material , optoelectronics , physics , mathematics , mathematical analysis , quantum mechanics
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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