On the phase diagram of mercuric iodide near the stoichiometric composition

H. Hermon*, M. Roth, M. Schieber, J. Shamir

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

The near-stoichiometric region of the HgI2 compound has been studied to update the phase diagram of the iodine - mercury system. Stoichiometry evaluation has been performed using Raman spectroscopy, to determine the Hg excess as Hg2I2, and photometric analysis for determination of the iodine excess. The improved sensitivity of the methods has enabled to determine minute amounts of either mercury or iodine excess, as low as few ppm. HgI2 crystals doped by either mercury or iodine have been grown from the vapor phase at temperatures ranging from 58 to 200°C, and the results have been used for the completion of the phase diagram. The maximum amount of Hg dissolved in HgI2 is 720 ppm at 120°C, but at higher crystal growth temperatures the concentration is reduced due to the thermal decomposition of Hg2I2. Free iodine solubility in HgI2 at growth temperatures ranging from 70° to 120°C is 130 - 140 ppm, whereas above 130°C (the α-β phase transition temperature) iodine solubility increases up to 210 ppm.

Original languageEnglish
Pages (from-to)229-234
Number of pages6
JournalMaterials Research Bulletin
Volume28
Issue number3
DOIs
StatePublished - Mar 1993

Fingerprint

Dive into the research topics of 'On the phase diagram of mercuric iodide near the stoichiometric composition'. Together they form a unique fingerprint.

Cite this