Halide precursors

Gallium Trichloride GaCl3

  • Melting point: 78°C

  • Boiling point: 201°C

  • Condensed phase density: 2.47g/cm3 (at 25°C)

  • Molar mass: 176.08 g/mol

Saturated vapor pressure.

# T -- temperature, C
# P -- saturated  vapor pressure, Pa
if  78 <= T <= 200:
  P = 10 ** (10.32 - 2511 / (T + 273.15))
if  50 <= T <= 78:
  P = 10 ** (14.00 - 3805 / (T + 273.15))

GaCl<sub>3</sub> saturated vapor pressure

Gallium Tribromide GaBr3

  • Melting point: 122°C

  • Boiling point: 279°C

  • Condensed phase density: 3.69g/cm3 (at 25°C)

  • Molar mass: 309.4g/mol

Gallium Triiodide GaI3

  • Melting point: 210°C

  • Boiling point: 346°C

  • Condensed phase density: 4.15g/cm3 (at 25°C)

  • Molar mass: 450.4g/mol

Metallic gallium chlorination

Gallium chlorides can be produced inside a reactor by passing dry hydrogen chloride (HCl) or Chlorine (Cl2) gas over a boat with liquid gallium. The composition of produced chlorides mainly depends on chlorination temperature --- at temperatures below ~350°C, Gallium trichloride GaCl3 and its dimer Ga2Cl6 are the main reaction products. At higher temperatures, gallium monochloride GaCl becomes dominant.

Bibliography

  1. Brunetti, B., Piacente, V., & Scardala, P. (2010). Vapor Pressures of Gallium Trifluoride, Trichloride, and Triiodide and Their Standard Sublimation Enthalpies. Journal of Chemical & Engineering Data, Vol. 55, No. 1, 2010