We have studied the thermoelectric properties of the stoichiometric and off-stoichiometric Heusler compounds (formula presented) (formula presented) Ga) between 10 and 300 K. Seebeck coefficient (S) measurements indicate that stoichiometric (formula presented) and (formula presented) are p-type materials with moderate S values of about (formula presented) at room temperature. Upon substituting the Fe site with V, a significant enhancement on Seebeck coefficients accompanied by a sign change are observed. On the other hand, the low-temperature resistivity (formula presented) grows drastically with V substitution for Fe, while the thermal conductivity (formula presented) remains almost unaffected in the substitution levels we investigated. These features are consistent with other experimental results and are related to issues raised by band-structure calculations. The thermoelectric performance in these semimetallic Heusler compounds is estimated to be an order of magnitude lower than conventional thermoelectric materials.
|Number of pages||5|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2002 Jan 1|
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics