Thermodynamic study of some chromium‐containing gaseous molecules by high‐temperature mass spectrometry

A number of gaseous oxyacid salts have been identified by Knudsen effusion mass spectrometry, while vaporizing Cr 2 O 3 and mixtures of Cr 2 O 3 +Nb 2 O 5 , Cr 2 O 3 +Ta 2 O 5 , Cr 2 O 3 +BaO, and Cr 2 O 3 +Mg 2 P 2 O 7 from molybdenum and tungsten cells. The stabilities of the gaseous molecules CrMoO 3 , CrMoO 4 , CrMoO 5 , CrWO 3 , CrWO 4 , CrWO 5 , CrNbO 3 , CrTaO 3 , CrPO 2 , CrPO 3 , BaCrO 2 and BaCrO 3 were deduced from the measurements. The thermodynamic properties of this gaseous chromium‐containing species are summarized. Prediction is tentatively made of the stability of as‐yet unstudied gaseous molecules. Copyright © 2003 John Wiley & Sons, Ltd.