Study of mercuric iodide near melting using differential scanning calorimetry Raman spectroscopy, and x-ray diffraction
High-temperature studies of mercuric iodide (HgI/sub 2/) involving differential scanning calorimetry (DSC), Raman spectroscopy, and x- ray powder diffraction have failed to confirm the existence of a red-colored tetragonal high-temperature phase called ..cap alpha.. '-HgI/sub 2/ reported by S.N. Toubektsis et al., (S.N. Toubektsis, E.K. Polychroniadis, and N.A. Economou, J. Appl. Phys., 58(5) (1985) 2070), using DSC measurements. The multiple DSC peaks near melting reported by Toubektsis are found by the present authors only if the sample is heated in a stainless-steel container. Using a Pyrex container or inserting a platinum foil between the HgI/sub 2/ and the stainless-steel container yields only one sharp, single DSC peak at the melting point. The nonexistence of the ..cap alpha..' phase is confirmed by high- temperature x-ray diffraction and Raman spectroscopy performed in the vicinity of the melting point which clearly indicate the existence of the yellow orthorhombic ..beta..-HgI/sub 2/ phase only. The experimental high-temperature DSC, Raman, and x-ray diffraction data are presented and discussed. 14 refs., 8 figs., 2 tabs.
- Research Organization:
- EG and G Energy Measurements, Inc., Goleta, CA (USA). Santa Barbara Operations
- DOE Contract Number:
- AC08-83NV10282
- OSTI ID:
- 6842483
- Report Number(s):
- EGG-10282-2147; CONF-8709315-8; ON: DE88014957
- Resource Relation:
- Conference: 6. international workshop on compound semiconductors for room temperature X-ray and nuclear detectors, Davos, Switzerland, 14 Sep 1987; Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
MERCURY IODIDES
PHASE TRANSFORMATIONS
CALORIMETRY
COMPARATIVE EVALUATIONS
EXPERIMENTAL DATA
HIGH TEMPERATURE
MEDIUM TEMPERATURE
MELTING POINTS
RAMAN SPECTROSCOPY
TEMPERATURE EFFECTS
X-RAY DIFFRACTION
COHERENT SCATTERING
DATA
DIFFRACTION
HALIDES
HALOGEN COMPOUNDS
INFORMATION
IODIDES
IODINE COMPOUNDS
LASER SPECTROSCOPY
MERCURY COMPOUNDS
MERCURY HALIDES
NUMERICAL DATA
PHYSICAL PROPERTIES
SCATTERING
SPECTROSCOPY
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
400201* - Chemical & Physicochemical Properties