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The Influence of Ni on the Transport Properties of CoSb3

Published online by Cambridge University Press:  01 February 2011

Ctirad Uher ,
Jeffrey S. Dyck ,
Wei Chen ,
Gregory P. Meisner  and
Jihui Yanga
Ctirad Uher
Affiliation:
Department of Physics, University of Michigan, Ann Arbor, MI 48109, [email protected]
Jeffrey S. Dyck
Affiliation:
Department of Physics, University of Michigan, Ann Arbor, MI 48109, [email protected]
Wei Chen
Affiliation:
Department of Physics, University of Michigan, Ann Arbor, MI 48109, [email protected]
Gregory P. Meisner
Affiliation:
Materials and Processes Laboratory, GM R&D and Planning, Warren, MI 48090
Jihui Yanga
Affiliation:
Department of Physics, University of Michigan, Ann Arbor, MI 48109, [email protected] Materials and Processes Laboratory, GM R&D and Planning, Warren, MI 48090
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Abstract

The effect of Ni doping on the Co site of the binary skutterudite CoSb3 is investigated. We measured resistivity, Hall effect, magnetoresistance, thermopower, thermal conductivity, and magnetization of a series of samples of the form Co1-xNixSb3 with x in the range x=0 to x=0.01. We find that Ni takes the tetravalent state Ni4+, assumes the d6 electronic configuration for the lower energy non-bonding orbitals, and gives an electron to the conduction band. Ni doping dramatically suppresses the thermal conductivity, changes the temperature dependence of the thermopower, and increases the carrier concentration. Low temperature anomalies in thermopower, Hall coefficient and magnetoresistance are found.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 626: Symposium Z – Thermoelectric Materials 2000 - The Next Generation Materials for Small-Scale Refrigeration and Power Generation Applications , 2000 , Z10.3
Copyright
Copyright © Materials Research Society 2000

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References

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