Kinetics of hexagonal–cubic phase transformation of zinc sulfide in vacuo, in zinc vapor, and in sulfur vapor

Authors:
  • TBTamas Bansagi
    Tamas Bansagi
  • ESE. A. Secco
    E. A. Secco
  • OSO. K. Srivastava
    O. K. Srivastava
  • RMRonald R. Martin
    Ronald R. Martin
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Abstract
The kinetics of the hexagonal–cubic phase transformation of zinc sulfide have been studied in vacuo, in zinc vapor, and in sulfur vapor in the temperature range 800–900 °C by a powder X-ray diffraction technique. The transformation rate is enhanced in the presence of sulfur and zinc vapor. In vacuo and in sulfur vapor the reaction is nucleation-controlled with activation energies of 95.0 and 98.5 ± 5 kcal, respectively. In zinc vapor the reaction is diffusion-controlled with the diffusion coefficient expressed as[ ]The modes of catalytic action by sulfur and zinc vapor on the solid phase transformation reaction are discussed.
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