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Effect of partial filling of the structural vacant sites on the thermoelectric properties of Zr0.25Hf0.75NiSn half-Heusler alloy

Published online by Cambridge University Press:  01 February 2011

Julien Pierre Amelie Makongo Mangan ,
Dinesh Misra ,
Nathan J. Takas ,
Kevin L. Stokes ,
Heike Gabrisch  and
Pierre F. P. Poudeu
Julien Pierre Amelie Makongo Mangan
Affiliation:
jmakongo@uno.edu, University of New Orleans, Advanced Materials Research Institute, New Orleans, Louisiana, United States
Dinesh Misra
Affiliation:
dmisra@uno.edudakkmisra@gmail.com, University of New Orleans, Advanced Materials Research Institute, New Orleans, Louisiana, United States
Nathan J. Takas
Affiliation:
ntakas@uno.edu, University of New Orleans, Advanced Materials Research Institute, New Orleans, Louisiana, United States
Kevin L. Stokes
Affiliation:
klstokes@uno.edu, University of New Orleans, Departement of Physics and the Advanced Materials Research Institute, New Orleans, Louisiana, United States
Heike Gabrisch
Affiliation:
hgabrisc@uno.edu, University of New Orleans, Department of Chemistry and the Advanced Materials Research Institute, New Orleans, Louisiana, United States
Pierre F. P. Poudeu
Affiliation:
ppoudeup@uno.edu, University of New Orleans, Department of Chemistry and the Advanced Materials Research Institute, New Orleans, Louisiana, United States
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Abstract

Composites containing mainly-half-Heusler MNiSn (HH) and full-Heusler MNi2Sn (FH) were prepared by solid state reaction of a mixture of polycrystalline bulk HH alloy with various concentrations of Ni up to 10 wt.%. Electrical conductivities, thermal conductivities and thermopowers of spark plasma sintered specimens of the as synthesized composite materials were measured in the temperature range from 300 K to 750 K. The conduction type of the composite changes from semiconductor to semimetal for Ni concentrations up to 2 wt.% and from semimetal to metal for higher Ni concentrations above 5 wt.%. A strong reduction in lattice thermal conductivity was observed for the composite containing 10 wt. % Ni inclusions.

Keywords

compositethermoelectrictransmission electron microscopy (TEM)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1267: Symposium DD – Thermoelectric Materials 2010-Growth, Properties, Novel Characterization Methods and Applications , 2010 , 1267-DD05-12
Copyright
Copyright © Materials Research Society 2010

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