This paper presents a thermogravimetric approach to evaluate the vapor pressure of low-volatility inorganic compounds such as CuCl and InCl3 under atmospheric conditions.The thermogravimetric analysis (TGA) approach is inherently more straightforward than alternatives such as torsion studies and mass spectrometry. Vapor pressures are evaluated using the Clausius-Clapeyron relationship between the vapor pressure and sublimation (or vaporization) enthalpy at a given temperature. Despite the relative simplicity of TGA, the highly hygroscopic nature of InCl3 demands some caution in the data analysis. Especially at high temperature, a solid-phase oxidation product In2O3 remains as a residual mass.Water is found to be the oxidation agent, with the residual proceeding through a solid-phase InOCl intermediate. However in the relatively low temperature range of interest oxidation is found to be negligible, with the gas-phase sublimation product being In2Cl6. This paper reports sublimation enthalpies and vapor pressures as functions of temperature in the range T greater than or equal to 570, less than or equal to 640K and atmospheric pressure.
Compounds
#
Formula
Name
1
Cl3In
indium chloride
2
ClCu
copper monochloride
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.