期刊
SOLID STATE SCIENCES
卷 26, 期 -, 页码 16-22出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.solidstatesciences.2013.09.005
关键词
Half-Heusler TiNiSn; Thermoelectrics; Microstructure; Ni nanoparticles; Spark plasma sintering
资金
- NSF DMR [1121053]
- Alexander von Humboldt foundation
- ConvEne IGERT Program [NSF-DGE 0801627]
- RISE Program (NSF DMR) [1121053]
- MRSEC Program (NSF DMR) [1121053]
- Center for Energy Efficient Materials (CEEM)
- U.S. Department of Energy, Office of Basic Energy Sciences [DESC0001009]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-ACO2-06CH11357]
The electronic and thermal properties of thermoelectric materials are highly dependent on their microstructure and therefore on the preparation conditions, including the initial synthesis and, if applicable, densification of the obtained powders. Introduction of secondary phases on the nano- and/or microscale is widely used to improve the thermoelectric figure of merit by reduction of the thermal conductivity. In order to understand the effect of the preparation technique on structure and properties, we have studied the thermoelectric properties of the well-known half-Heusler TiNiSn with addition of a small amount of nickel nanoparticles. The different parameters are the initial synthesis (levitation melting and microwave heating), the amount of nickel nanoparticles added and the exact pressing profile using spark plasma sintering. The resulting materials have been characterized by synchrotron X-ray diffraction and microprobe measurements and their thermoelectric properties are investigated. We found the lowest (lattice) thermal conductivity in samples with full-Heusler TiNi2Sn and Ni3Sn4 as secondary phases. (C) 2013 Elsevier Masson SAS. All rights reserved.
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