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 language | English |
---|---|
Article number | 072132 |
Journal | AIP Advances |
Volume | 3 |
Issue number | 7 |
DOIs | |
Publication status | Published - 2013 Aug 26 |
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)