The thermoelectric transport properties of Lu-doped 14MnSb 11 Zintl compounds have been investigated. The electrical conductivity increased and the Seebeck coefficient decreased with increasing Lu doping content, due to an increased carrier concentration. The carrier mobility behavior was in good accordance with the single parabolic band model. It is suggested that Lu doping simply shifts the Fermi energy with the band structure minimally altered. The lattice thermal conductivity roughly decreased via Lu doping. The maximum dimensionless figure of merit ZT of the Ludoped samples was improved by ∼30% at 670 K, compared with that without doping.
ASJC Scopus subject areas
- Physics and Astronomy(all)