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Presentation
Efffect of Partial Filling of the Structural Vacant Sites on the Thermoelectric Properties of Zr0.25Hf0.75NiSn half-Heusler Alloy
MRS Proceedings (2010)
  • Julien P. A. M. Makongo, University of New Orleans
  • Dinesh Misra, University of New Orleans
  • Nathan J. Takas, Georgia Southern University
  • Kevin L. Stokes, University of New Orleans
  • Heike Gabrisch, University of New Orleans
  • Pierre F.P. Poudeu, University of New Orleans
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
  • Composite,
  • Thermoelectric,
  • Transmission electron microscopy (TEM)
Disciplines
Publication Date
2010
Citation Information
Julien P. A. M. Makongo, Dinesh Misra, Nathan J. Takas, Kevin L. Stokes, et al.. "Efffect of Partial Filling of the Structural Vacant Sites on the Thermoelectric Properties of Zr0.25Hf0.75NiSn half-Heusler Alloy" MRS Proceedings (2010)
Available at: http://works.bepress.com/nathan_takas/12/