Abstract
In this paper, we present the first results of the use of mass spectrometry of the vapor phase above solid of various compositions in order to characterize these samples. Vapor pressure curves, enthalpies of vaporization, clastograms of the ionized species, and total evaporation experiments reveal appreciable differences in the composition of the vapor phase above the crystals grown with excess of mercury or iodine, or doped with hydrocarbons. Both excess mercury and iodine can be dissolved in the lattice. However, they disappear during evaporation, the remaining solid having stoichiometric vapor. If the samples are treated with hydrocarbons, then the nonstoichiometric vapors, i.e., those containing , together with or , will remain until the end of evaporation, indicating that the nonstoichiometry of the crystals becomes fixed. The difficulties in the synthesis of the stoichiometric are discussed based on the existing thermodynamic data.
Published Version
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