期刊
JOURNAL OF ELECTRONIC MATERIALS
卷 38, 期 7, 页码 1287-1292出版社
SPRINGER
DOI: 10.1007/s11664-009-0660-3
关键词
Thermoelectric materials; rare-earth sulfides; CS2 sulfurization; pressure-assisted reaction sintering; self-doping
Ternary rare-earth sulfides NdGd1+x S-3, where 0 a parts per thousand currency sign x a parts per thousand currency sign 0.08, were prepared by sulfurizing Ln(2)O(3) (Ln = Nd, Gd) with CS2 gas, followed by reaction sintering. The sintered samples have full density and homogeneous compositions. The Seebeck coefficient, electrical resistivity, and thermal conductivity were measured over the temperature range of 300 K to 950 K. All the sintered samples exhibit a negative Seebeck coefficient. The magnitude of the Seebeck coefficient and the electrical resistivity decrease systematically with increasing Gd content. The thermal conductivity of all the sintered samples is less than 1.9 W K-1 m(-1). The highest figure of merit ZT of 0.51 was found in NdGd1.02S3 at 950 K.
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