| Issue |
Europhys. Lett.
Volume 35, Number 9, September III 1996
|
|
|---|---|---|
| Page(s) | 689 - 694 | |
| Section | Condensed matter: structure, thermal and mechanical properties | |
| DOI | https://doi.org/10.1209/epl/i1996-00171-0 | |
| Published online | 01 September 2002 | |
Pressure-induced electron transfer in quasi-molecular solids
Department of Physics and Astronomy, The University of Edinburgh,
Mayfield Road, Edinburgh EH9 3JZ, Scotland, UK
Received:
27
June
1996
Accepted:
12
August
1996
A combination of Raman scattering and synchrotron X-ray powder diffraction on Group-V metal
triiodides (
, 
) has revealed a continuous isostructural transition
from a molecular solid to a two-dimensional layered crystal under high pressure.
The loss of molecular identity proceeds by gradual pressure-induced electron transfer
from intramolecular to intermolecular bonds and suppression of
sp3 hybridisation. Initial pressure increase has the effect of destroying
molecular units while continued compression enhances intralayer cohesion. These two
effects give rise to a non-monotonic pressure variation of the X-I bond-stretching
frequency.
PACS: 61.10.-i – X-ray diffraction and scattering / 68.65.+g – Layer structures: multilayers, and superlattices (growth, structure, and nonelectronic properties) / 78.30.-j – Infrared and Raman spectra and scattering
© EDP Sciences, 1996
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