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Solid state reactive sintering of cold pressed thermoelectric Mg3Sb2

  • Journal of the Korean Crystal Growth and Crystal Technology
  • Abbr : J. Korean Cryst. Growth Cryst. Technol.
  • 2014, 24(4), pp.176-182
  • DOI : 10.6111/JKCGCT.2014.24.4.176
  • Publisher : The Korea Association Of Crystal Growth, Inc.
  • Research Area : Engineering > Materials Science and Engineering

Kim In Ki 1 Kyung Wook Jang 1 Han-Jun Oh 1

1한서대학교

Accredited

ABSTRACT

We intended to prepare Mg3Sb2 compound bodies through solid state reactive sintering after cold-pressingmixtures of elementary Mg and Sb powders and investigated the crystal phases of the sintered bodies according to Mg/Sbmole ratios and reaction temperatures. The Mg3Sb2 bodies sintered at the temperatures of 773~843 K showed typicalcrystalline phases of Mg3Sb2 compounds, but their diffraction angles in XRD patterns were slightly different along with thevertical axis of the bodies obtained. All the bottom parts of the sintered Mg3Sb2 bodies were composed of the typicalcrystalline phases of Mg3Sb2 compounds and their diffraction angles were completely in accord with those of the α-Mg3Sb2phase, when Mg : Sb = 3.15 : 1.85 at 823 K, or when the Mg moles were greater than or equal to 3.10 at 843 K. It wasconsidered that the slightly remaining Mg phases were formed by precipitation from α-Mg3Sb2 phases during thesolidification process of liquid phase.

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