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Effects of convection on physical vapor transport of Hg2Cl2 in the presence of Kr - Part I: under microgravity environments

  • Journal of the Korean Crystal Growth and Crystal Technology
  • Abbr : J. Korean Cryst. Growth Cryst. Technol.
  • 2013, 23(1), pp.20~26
  • DOI : 10.6111/JKCGCT.2013.23.1.020
  • Publisher : The Korea Association Of Crystal Growth, Inc.
  • Research Area : Engineering > Materials Science and Engineering

Lee, Yongkeun 1,  Geug Tae Kim 2

1서울과학기술대학교
2한남대학교

Accredited

ABSTRACT

Special attention in the role of convection in vapor crystal growth has been paid since some single crystals under microgravity environments less than 1 g0 exhibits a diffusive-convection mode and much uniformity in front of the crystal regions than a normal gravity acceleration of 1 g0. The total molar fluxes show asymmetrical patterns in interfacial distribution, which indicates the occurrence of either one single or more than one convective cell. As the gravitational level decreases form 1 g0 down to 1.0 × 10−4 g0, the intensity of convection, indicative of the maximum molar fluxes, is reduced significantly for ΔT = 30 K and 90 K. The total molar fluxes decay first order exponentially with the partial pressure of component B, PB (Torr) for 20 Torr ≤ PB ≤ 300 Torr, and two gravity accelerations of gy = 1 g0 and 0.1 g0.

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