High thermoelectric power factor in Fe-substituted Mo.sub.3./sub.Sb.sub.7./sub..

0352410 - FZÚ 2011 RIV US eng J - Journal Article
Candolfi, C. - Lenoir, B. - Dauscher, A. - Malaman, B. - Guilmeau, E. - Hejtmánek, Jiří - Tobola, J.
High thermoelectric power factor in Fe-substituted Mo₃Sb₇.
Applied Physics Letters. Roč. 96, č. 26 (2010), 262103/1-262103/3. ISSN 0003-6951. E-ISSN 1077-3118
R&D Projects: GA ČR GA203/09/1036
Institutional research plan: CEZ:AV0Z10100521
Keywords : antimony alloys * band structure * chemical exchanges * electrical resistivity * electronic density of states * electronic structure * Fermi level
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 3.820, year: 2010

Thermoelectric properties of the Mo2.57Fe0.43Sb7 compound, a ternary derivative of Mo3Sb7, are reported from 2 up to 1000 K. Even though Fe substitution keeps low electrical resistivity values,high thermopower values are achieved at high temperatures. Electronic band structure calculations show that the high thermopower observed arises from the beneficial influence of iron d-states contribution to the density of states at the Fermi level. A high power factor similar to those of the best state-of-the-art thermoelectric materials emerges which, coupled with magnetic excitations that help to keep very low thermal conductivity values, leads to a dimensionless thermoelectric figure of merit of 0.55 at 1000 K.
Permanent Link: http://hdl.handle.net/11104/0191919