Galvanomagnetic and Thermomagnetic Properties of Ag$_{(1-x)}$Na$_{x}$SbTe$_{2}$ Alloys

ORAL

Abstract

Group I-V-VI$_{2}$ alloys have intrinsically low thermal conductivity$^{1}$ on the order of 0.65 W/mK due to Umklapp phonon-phonon scattering. Combined with the high valence band density of states in AbSbTe$_{2}$, this makes this material system ideal for thermoelectric applications up to 416 K, where AgSbTe$_{2}$ undergoes a crystallographic phase transition. The partial substitution of Na for Ag is expected to address this problem. We synthesize bulk Ag$_{(1-x)}$Na$_{x}$SbTe$_{2}$ alloys and measure the evolution of the phase transition as a function of Na concentration x. The thermoelectric and galvanomagnetic properties of the alloys are also studied: based on the measurement of resistivity, Seebeck, Nernst and Hall coefficients we calculate mobilities, Fermi energies and partial carrier concentrations of holes and electrons.

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Authors

  • Michele Nielsen

    • Department of Mechanical Engineering, Ohio State University, Columbus OH

  • Vladimir Jovovic

    • The Ohio State University
    • Department of Mechanical Engineering, Ohio State University, Columbus OH

  • Christopher Jaworski

    • Department of Mechanical Engineering, The Ohio State University, Columbus, OH
    • Department of Mechanical Engineering, Ohio State University, Columbus OH

  • Joseph P. Heremans

    • Department of Mechanical Engineering and Department of Physics, The Ohio State University, Columbus, OH
    • The Ohio State University
    • Department of Mechanical Engineering and Department of Physics, Ohio State University , Columbus, OH
    • Department of Mechanical Engineering and Department of Physics, The Ohio State University