Preparation and Thermoelectric Properties of LaGd1+x S3 and SmGd1+x S3
Source: Journal of Electronic Materials, Volume 40, Number 5, May 2011 , pp. 537-542(6)
Abstract:Thermoelectric materials are attractive since they can recover waste heat directly in the form of electricity. In this study, the thermoelectric properties of ternary rare-earth sulfides LaGd1+x S3 (x = 0.00 to 0.03) and SmGd1+x S3 (x = 0.00 to 0.06) were investigated over the temperature range of 300 K to 953 K. These sulfides were prepared by CS2 sulfurization, and samples were consolidated by pressure-assisted sintering to obtain dense compacts. The sintered compacts of LaGd1+x S3 were n-type metal-like conductors with a thermal conductivity of less than 1.7 W K−1 m−1. Their thermoelectric figure of merit ZT was improved by tuning the chemical composition (self-doping). The optimized ZT value of 0.4 was obtained in LaGd1.02S3 at 953 K. The sintered compacts of SmGd1+x S3 were n-type hopping conductors with a thermal conductivity of less than 0.8 W K−1 m−1. Their ZT value increased significantly with temperature. In SmGd1+x S3, the ZT value of 0.3 was attained at 953 K.
Document Type: Research Article
Affiliations: 1: Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba Central 2, Tsukuba, Ibaraki, 305-8568, Japan, Email: firstname.lastname@example.org 2: College of Design and Manufacturing Technology, Muroran Institute of Technology, 27-1 Mizumoto, Muroran, 050-8585, Japan
Publication date: May 1, 2011