Electronic Transport Properties of Pd-substituted (Zr,Hf)NiSn Half Heusler Alloys

POSTER

Abstract

ZrNiSn-based alloys which crystallize in the half-Heusler structure are currently being investigated as potential thermoelectric materials due to their relatively large Seebeck coefficient. Here, we present measurements of the electronic transport properties of Zr$_{0.5}$Hf$_{0.5}$Ni$_{1{\-}x}$Pd$_{x}$Sn$_{0.99}$Sb$_{0.01 }$semiconducting half-Heusler compounds with Pd concentrations range from x=0 to1. The compounds are synthesized by solid-state chemical reaction at 900\r{ }C. The compounds are densified into 10~mm pellets by uniaxial hot pressing. Measured electrical conductivity, thermoelectric power, and Hall coefficient data are analyzed to extract carrier concentration and carrier mobility. All compounds in the series are n-type. The magnitude of the Seebeck coefficient is found to decreases with increasing Pd concentration. The electrical conductivity and carrier mobility are found to be dependent on the materials processing conditions as well as the Pd concentration.

Authors

  • Westly Nolting

    University of New Orleans

  • Philip Adams

    Department of Physics and Astronomy, Louisiana State University, ORNL, UT, ORNL/UT, UK, LSU, Louisiana State University, Zhejiang Normal University, Center for Computation and Technology, Louisiana State University, University of Tuebingen, Germany, Aristotle University of Thessaloniki, Greece, Max Planck Institute for Astrophysics, Max Plank Institute for Astrophysics, Laboratoire d'Astrophysique de Marseille, Albert Einstein Institute, California Institute of Technology, Dept. of Physics \& Astronomy, Louisiana State University, Baton Rouge, LA 70803, Dept. of Physics \& Astronomy, Louisiana State Univ., Baton Rouge, LA 70803, NASA Marshall Space Flight Center, Dept. of Physics \& Astronomy, Louisiana State University, Ohio State University, Wright State University, Department of Physics, North Carolina A\&T State University, Clark Atlanta University, Department of Electrical and Computer Engineering, Pennsylvania State University, University Park, P, Princeton University, University of New Orleans, Alabama A\&M University, Vanderbilt Univ., Konstanz Univ., Isik Univ., Department of Physics, Yale University

  • Philip Adams

    Department of Physics and Astronomy, Louisiana State University, ORNL, UT, ORNL/UT, UK, LSU, Louisiana State University, Zhejiang Normal University, Center for Computation and Technology, Louisiana State University, University of Tuebingen, Germany, Aristotle University of Thessaloniki, Greece, Max Planck Institute for Astrophysics, Max Plank Institute for Astrophysics, Laboratoire d'Astrophysique de Marseille, Albert Einstein Institute, California Institute of Technology, Dept. of Physics \& Astronomy, Louisiana State University, Baton Rouge, LA 70803, Dept. of Physics \& Astronomy, Louisiana State Univ., Baton Rouge, LA 70803, NASA Marshall Space Flight Center, Dept. of Physics \& Astronomy, Louisiana State University, Ohio State University, Wright State University, Department of Physics, North Carolina A\&T State University, Clark Atlanta University, Department of Electrical and Computer Engineering, Pennsylvania State University, University Park, P, Princeton University, University of New Orleans, Alabama A\&M University, Vanderbilt Univ., Konstanz Univ., Isik Univ., Department of Physics, Yale University

  • Kevin Stokes

    University of New Orleans