Hostname: page-component-7479d7b7d-pfhbr Total loading time: 0 Render date: 2024-07-15T23:58:41.498Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1. Tolbert, S. H. and Alivisatos, A. P., Science, 265, 373 (1994).Google Scholar
2. Mu, R., Jin, F., Morgan, S. H., Henderson, D. O. and Silberman, E., J. Chem., Phys., 100, 7749 (1994).Google Scholar
3. Awschalom, D. D. and Warnock, J., Phys. Rev., B35, 6779 (1987).Google Scholar
4. Mu, R. and Malhotra, V., Phys. Rev., B44, 4296 (1991).Google Scholar
5. Richter, H., Wang, Z. P., and Ley, L., Solid State Commun., 39, 625 (1981).Google Scholar
6. Burger, A., Morgan, S., Jiang, H., Silberman, E., Schieber, M., Van Den Berg, L., Keller, L., and Wagner, C. N., Nuc. Inst. Met. Phys. Res., A283, 130 (1987).Google Scholar
7. Rogstad, A., Acta Chim. Scand., 27, 57 (1973).Google Scholar
8. Newkirk, J. B., Acta Metallurg., 4, 316 (1956).Google Scholar
9. Tang, Z. K., Nozue, Y., and Goto, T., J. Phys. Soc. Japan, 61, 2943 (1992).Google Scholar
10. Micic, O. I., Nenadovic, M. T., Peterson, M. W., and Nozik, J. A., J. Phys. Chem., 91, 1295 (1987).Google Scholar
11. Adams, D. M. and Appelby, R. P., Inorganica Chimica Acta, 26, L43 (1978).Google Scholar