Abstract
The occurrence of deviations from stoichiometry of the semi-insulator compound HgI 2 has been established using a very elaborate chemical analytical procedure. It was found that the molar ratio of I 2 Hg varies from 1.993 to 2.015 (±0.002). The deviations from stoichiometry have been corroborated by studying the red to yellow solid state phase transformation temperature. It was found that the compounds, whether rich or poor in iodine, have lower T tr than those closest to stoichiometry, i.e., where the I 2 Hg ratio is 2.000.
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