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Nano-domains in thermoelectric Half-Heusler CoTi0.5Sc0.5Sb alloys

Published online by Cambridge University Press:  19 March 2015

Joaquin Miranda Mena ,
Heiko G. Schoberth ,
Thomas Gruhn  and
Heike Emmerich
Joaquin Miranda Mena
Affiliation:
Lehrstuhl für Material- und Prozesssimulation, Universität Bayreuth, Universitätsstraße 30, D-95447 Bayreuth, Germany
Heiko G. Schoberth
Affiliation:
Lehrstuhl für Material- und Prozesssimulation, Universität Bayreuth, Universitätsstraße 30, D-95447 Bayreuth, Germany
Thomas Gruhn
Affiliation:
Lehrstuhl für Material- und Prozesssimulation, Universität Bayreuth, Universitätsstraße 30, D-95447 Bayreuth, Germany
Heike Emmerich
Affiliation:
Lehrstuhl für Material- und Prozesssimulation, Universität Bayreuth, Universitätsstraße 30, D-95447 Bayreuth, Germany
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Abstract

Nano-phase separation is of great relevance for functional materials like thermoelectrics. Indeed, nano-domains in CoSb-based half-Heusler thermoelectrics have been found to reduce the lattice heat conductivity, which increases the figure of merit. Within this context, we studied the configurational energy in the alloy CoTi0.5Sc0.5Sb by means of first-principle calculations. We consider structures formed by Ti (Sc) nano-domains. In recent publications we have showed that these domains are the most stable atomic configurations. In this work we found that for a given concentration the electronic density of states is considerably modified as the volume of the domains are increased.

Keywords

alloyelectronic structurethermoelectric
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1735: Symposium S/W/CC – Advanced Materials for Photovoltaic, Fuel Cell and Electrolyzer, and Thermoelectric Energy Conversion , 2015 , mrsf14-1735-cc04-09
Copyright
Copyright © Materials Research Society 2015 

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References

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