TY - JOUR
T1 - On the phase diagram of mercuric iodide near the stoichiometric composition
AU - Hermon, H.
AU - Roth, M.
AU - Schieber, M.
AU - Shamir, J.
PY - 1993/3
Y1 - 1993/3
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0027553854&partnerID=8YFLogxK
U2 - 10.1016/0025-5408(93)90156-8
DO - 10.1016/0025-5408(93)90156-8
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AN - SCOPUS:0027553854
SN - 0025-5408
VL - 28
SP - 229
EP - 234
JO - Materials Research Bulletin
JF - Materials Research Bulletin
IS - 3
ER -