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A Spectroscopic and Thermodynamic Investigation of Mercuric Iodide Physically Confined in Porous Glass Hosts

Published online by Cambridge University Press:  15 February 2011

D. O. Henderson ,
R. Mu ,
A. Ueda ,
A. Burger ,
K. T. Chen  and
D. O. Frazier
D. O. Henderson
Affiliation:
Physics Department, Fisk University, Nashville, TN 37208
R. Mu
Affiliation:
Physics Department, Fisk University, Nashville, TN 37208
A. Ueda
Affiliation:
Physics Department, Fisk University, Nashville, TN 37208
A. Burger
Affiliation:
Physics Department, Fisk University, Nashville, TN 37208
K. T. Chen
Affiliation:
Physics Department, Fisk University, Nashville, TN 37208
D. O. Frazier
Affiliation:
Space Science Laboratory, Chemistry and Polymeric Materials Branch, Marshall Space Flight Center, Huntsville, AL 35812
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Abstract

Raman and electronic spectra and results from differential scanning calorimetry (DSC) are reported for mercuric iodide (HgI2) confined in four different pore-sized glass hosts. The Raman spectra reveal peaks at 39 and 141 cm−1 that indicate the confined HgI2 is stabilized at 300 K in a modified orthorhombic (yellow) β-phase which is observed at 400 K for the bulk material. An additional band begins to appear at 145 cm−1 for pore radii smaller than 3.75 nm suggesting the presence of new phase of confined HgI2. The DSC measurements show the melting and freezing transitions of confined β-HgI2 are depressed from values reported for the bulk material and the depression increases as the pore size decreases. No transition is observed in the DSC measurement which could be attributed to the α→β transition for the confined material. Evidence supporting the new phase of HgI2 is observed in the electronic spectra of the confined HgI2 by the appearance of an energy gap transitions located at 2.7 eV.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 366: Symposium N – Dynamics in Small Confining Systems , 1994 , 283
Copyright
Copyright © Materials Research Society 1995

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