Preparation and Thermoelectric Properties of Some Arsenopyrite Phases Based on RuSb2-2xTe2x and RuSb2-2xSe2x Solid Solutions
- Knolls Atomic Power Laboratory (KAPL), Niskayuna, NY (United States)
- California Institute of Technology (CalTech), Pasadena, CA (United States). Jet Propulsion Lab. (JPL)
The synthesis and some properties of several arsenopyrite phases based on RuSb2-2XTe2X and RuSb2-2XSe2X solid solutions is reported. The existence of solid solutions with the arsenopyrite structure in the RuSb2-2XTe2X system for 0.25 < x < 0.65 was confirmed. In the RuSb2-2XSe2X system, no series of solid solutions was found, and only the RuSbSe phase was prepared in single phase form. In an effort to assess the potential of these materials for thermoelectric applications, electrical resistivity, Seebeck coefficient, and thermal conductivity were measured between 300 and 1000K. Low thermal conductivity values were achieved for the ternary and quaternary compositions investigated, about five times lower than those obtained for binary compounds such as IrSb2 and CoSb2 at room temperature. In these materials, scattering of the phonons by electrons transferred between mixed valence ions accounts for the low thermal conductivity observed. Despite these low values, the samples are characterized by low carrier mobility and high electrical resistivity values, resulting in thermoelectric figures of merit lower than state-of-the-art thermoelectric materials.
- Research Organization:
- Knolls Atomic Power Laboratory (KAPL), Niskayuna, NY (United States); California Institute of Technology (CalTech), Pasadena, CA (United States). Jet Propulsion Lab. (JPL)
- Sponsoring Organization:
- USDOE; National Aeronautics and Space Administration (NASA)
- DOE Contract Number:
- AC12-76SN00052
- OSTI ID:
- 766930
- Report Number(s):
- KAPL-P-000239
- Country of Publication:
- United States
- Language:
- English
Similar Records
Thermoelectric material development. Quarterly technical progress report, January 1, 1995--March 31, 1995
Measured and simulated thermoelectric properties of FeAs 2−x Se x ( x = 0.30–1.0): from marcasite to arsenopyrite structure