Halide precursors

Hafnium Tetrachloride HfCl4

  • Melting point 432°C (vapor pressure 44.4 atm)

  • Sublimation temperature 315°C (1 atm)

  • Condensed phase density 3.86 g/cm3 (at 25°C)

  • Molar mass 320.3 g/mol

Saturated vapor pressure.

# T -- temperature, C
# P -- saturated  vapor pressure, Pa
# Thermochimica acta 244 (1994): 249-256.
if 125 <= T <= 227:
    P = 10 ** (13.64 - 5112/ (T + 273.15))

# P -- saturated  vapor pressure
# The Journal of Physical Chemistry, 62(3), 319-322.
if 190 <= T <= 400:
    P = 10**(11.712 - 5197.0/(T + 273.15))

HfCl<sub>4</sub> saturated vapor pressure

Hafnium Tetraiodide HfI4

  • CAS Registry Number: 13777-23-6

  • Molar mass: 686.11 g/mol

Saturated vapor pressure.

# T -- temperature, C
# P -- saturated  vapor pressure, Torr
# Stevenson, F. D., Wicks, C. E., & Block, F. E. (1963)
# gamma-solid
if 372 <= T <= 405:
  P = 10 ** (12.13 - 6173/(T + 273.15))
# beta-solid
if 325 <= T <= 372:
  P = 10 ** (13.97 - 7360/(T + 273.15))
# alpha-solid
if 302 <= T <= 324:
  P = 10 ** (19.56 - 10700/(T + 273.15))

HfI<sub>4</sub> saturated vapor pressure

Bibliography

  1. Stevenson, F. D., Wicks, C. E., & Block, F. E. (1963). Vapor pressure of tungsten (VI) chloride and hafnium (IV) iodide by a metal diaphragm technique (No. BM-RI-6367). Bureau of Mines, Albany, OR (USA). Albany Metallurgy Research Center.

  2. Tangri, R. P., and D. K. Bose. "Vapour pressure measurement of zirconium chloride and hafnium chloride by the transpiration technique." Thermochimica acta 244 (1994): 249-256.

  3. Palko, A. A., Ryon, A. D., & Kuhn, D. W. (1958). The vapor pressures of zirconium tetrachloride and hafnium tetrachloride. The Journal of Physical Chemistry, 62(3), 319-322.