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Comprehensive studies on thermo-solutal convection with high Prandtl numbers of mercurous bromide system of Hg ₂Br₂ and l₂ during physical vapor transport

  • Journal of the Korean Crystal Growth and Crystal Technology
  • Abbr : J. Korean Cryst. Growth Cryst. Technol.
  • 2024, 34(6), pp.236-244
  • DOI : 10.6111/JKCGCT.2024.34.6.236
  • Publisher : The Korea Association Of Crystal Growth, Inc.
  • Research Area : Engineering > Materials Science and Engineering
  • Received : December 5, 2024
  • Accepted : December 12, 2024
  • Published : December 31, 2024

Geug Tae Kim 1

1한남대학교

Accredited

ABSTRACT

During the Hg2Br2(A)-I2(B) physical vapor transport process with high Prandtl numbers, the temperature distributions in the vapor phase are uniform except near the crystal regions. It is also concluded that for 10-2g0≤g≤1g0 the thermo-solutal buoyancy driven convection is predominant in the vapor phase; near the gravitational levels of g = 10-2g0, the transition region from the convection mode to the diffusion mode occurs; for 10-6g0≤g≤10-4g0, the diffusion mode is predominant. For 10 K≤ΔT≤50K, the total molar flux enlarges proportionally increasing the driving force, i.e., the temperature gradients. The total molar flux of Hg2Br2 exponentially decays with the partial pressure of component B(I2), PB(Torr) for 50 Torr≤PB≤200 Torr.

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