On the phase diagram of mercuric iodide near the stoichiometric composition

Journal Article · Mon Mar 01 00:00:00 EST 1993 · Materials Research Bulletin; (United States)

DOI:https://doi.org/10.1016/0025-5408(93)90156-8· OSTI ID:6535648

Hermon, H; Roth, M; Schieber, M; Shamir, J ^[1]

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1. Hebrew Univ. of Jerusalem (Israel)

The near-stoichiometric region of the HgI[sub 2] 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 Hg[sub 2]I[sub 2], 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 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 HgI[sub 2] is 720 ppm at 120 C, but at higher crystal growth temperatures the concentration is reduced due to the thermal decomposition of Hg[sub 2]I[sub 2]. Free iodine solubility in HgI[sub 2] at growth temperatures ranging from 70 to 120 C is 130 - 140 ppm, whereas above 130 C (the [alpha]-[beta] phase transition temperature) iodine solubility increases up to 210 ppm.

• OSTI ID: 6535648
• Journal Information: Materials Research Bulletin; (United States), Vol. 28:3; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
36 MATERIALS SCIENCE
GAMMA SPECTROMETERS
MATERIALS
MERCURY IODIDES
PHASE DIAGRAMS
X-RAY SPECTROMETERS
CRYSTAL DOPING
PHOTOMETRY
SENSITIVITY
SOLUBILITY
STOICHIOMETRY
DIAGRAMS
HALIDES
HALOGEN COMPOUNDS
IODIDES
IODINE COMPOUNDS
MEASURING INSTRUMENTS
MERCURY COMPOUNDS
MERCURY HALIDES
SPECTROMETERS
440103* - Radiation Instrumentation- Nuclear Spectroscopic Instrumentation
360602 - Other Materials- Structure & Phase Studies