Thermoelectric properties of rare earth chalcogenidesThe rare earth chalcogenides are important thermoelectric materials due to their high melting points, self-doping capabilities, and low thermal conductivities. Lanthanum sulfides and lanthanum tellurides have been synthesized in quartz ampules, hot-pressed into samples, and measured. The n-type Seebeck coefficients, electrical resistivities, and power factors generally all increased as the temperature increased from 200 to 1000 C. The figure-of-merit for nonstoichiometric lanthanum telluride was 0.001/deg C at 1000 C, considerably higher than for silicon-germanium. Thermoelectric measurements were made for LaTe(2) and YbS(1.4), and p-type behavior was observed for these compounds from 300 to 1100 C.
Document ID
19860040169
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Danielson, L. R. (Thermo Electron Corp. Waltham, MA, United States)
Raag, V. (Thermo Electron Corp. Waltham, MA, United States)
Wood, C. (California Institute of Technology Jet Propulsion Laboratory, Pasadena, United States)