Total vapor pressures of AlBr3 and AlI3 were measured by a torsion effusion apparatus. Their temperature dependences are expressed by the equations log(p/Pa) = (14.78 +- 0.60) - (4700 +- 200)/(T/K) from (301.0 to 351.0) K and log(p/Pa) = (15.52 +- 0.30) - (5960 +- 150)/(T/K) from (359.5 to 419.5) K for AlBr3 and AlI3, respectively. Practically, AlBr3 vaporizes in a dimeric form, while AlI3 vaporizes in monomeric and dimeric forms. Treating the vapor pressures of AlBr3 by second- and third-law methods, the standard sublimation enthalpy ?Hdeg (298 K) = (90 +- 4) kJ*mol-1 was derived. For AlI3, treating the partial pressures of monomer and dimer gaseous species, deduced from the measured total vapor pressures and the constant of dimer-monomer equilibrium reported in the literature, by second- and third-law methods, the standard enthalpies ?Hdeg (298 K) = (110 +- 4) kJ*mol-1 and ?Hdeg (298 K) = (119 +- 4) kJ*mol-1 associated to the sublimation reactions of AlI3 according to the AlI3(s) ? AlI3(g) and 2AlI3(s) ? Al2I6(g), respectively, were selected.
Compounds
#
Formula
Name
1
AlBr3
aluminum bromide
2
AlI3
aluminum iodide
Datasets
The table above is generated from the ThermoML associated json file (link above).
POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied;
the numbers refer to the table of compounds on the left.