Year: 2017
Type: article
Abstract: The preparation and thermoelectric properties of Sn 2 S 3 polycrystalline samples were reported. An almost single-phase Sn 2 S 3 polycrystalline sample was obtained by heating Sn and S mixed powders: the sample was successfully densified using a spark-plasma-sintering method. Sn 2 S 3 building blocks with electron lone pairs were weakly bonded via van der Waals force. Similar to other compounds with electron lone pairs, a thermal conductivity lower than 1.4 W·m −1 ·K −1 was obtained for the Sn 2 S 3 sample from 298 to 701 K. Although the Sn 2 S 3 sample exhibited a high absolute value of Seebeck coefficient, its electrical conductivity was considerably low, leading to a low dimensionless figure of merit, z T , of 9.6 × 10 −4 at 700 K. The poor electrical transport properties indicated that the Sn 2 S 3 sample was a semiconductor with an extremely low carrier density, which was confirmed by measurements of its band gap and by calculations of the temperature dependence of Seebeck coefficient.
Institution: Tohoku University
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2612161463