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Compressibility and Vibrational Modes in Solid As4O6

✍ Scribed by Andrzej Grzechnik

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
223 KB
Volume
144
Category
Article
ISSN
0022-4596

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✦ Synopsis

The phonon spectrum of solid As 4 O 6 (arsenolite, Fd3m, Z ‫؍‬ 8) ambient and high pressures is studied with Raman and infrared spectroscopies and analyzed in relation to the vibrational spectrum of the adamantane As 4 O 6 molecule in the vapor state. The behavior of arsenolite upon compression can be interpreted as a result of an enhancement of intermolecular interactions between two equivalent As 4 O 6 molecules at T d symmetry sites of the 99primitive:: unit cell. The enforced interactions between the molecules through intermolecular O2O repulsions lead to a large increase of correlation 5eld splittings of the internal vibrations due to the predominant bending and bridge stretching deformations. Eventually, at about 6 GPa they lift degeneracies of the internal modes and lower the symmetry of the crystal lattice. The observed phase transition in solid As 4 O 6 is reversible without any hysteresis.

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