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Stability and Optical Properties of γ-Gd2S3 at High Pressures

✍ Scribed by Andrzej Grzechnik

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
163 KB
Volume
148
Category
Article
ISSN
0022-4596

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✦ Synopsis

High pressure behavior of -Gd 2 S 3 (I4M 3d, Z ‫؍‬ 4) is studied with X-ray di4raction, Raman spectroscopy, and optical re6ectivity. Upon compression to 30 GPa there is no structural phase transition. The pressure dependence of the infrared transparency in this material to 30 GPa is determined from its bulk modulus, extracted from the X-ray data, and the pressure shift of the highest wavenumber 5rst-order Raman mode. Optical re6ectivity spectra up to 20 GPa show a red shift of the lowest energy direct interband transitions. At higher pressures, broadening of the re6ectivity spectral features is associated with a loss of Raman intensity as a result of a possible transformation in the electronic structure. Free carriers do not emerge up to 35 GPa, indicating that -Gd 2 S 3 remains semiconducting.

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Optical Properties of Ga2Se3 under High
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✍ M. Takumi; T. Ueda; Y. Koshio; H. Nishimura; K. Nagata 📂 Article 📅 2001 🏛 John Wiley and Sons 🌐 English ⚖ 107 KB 👁 2 views

The optical absorption spectrum of b-Ga 2 Se 3 has been measured at pressures up to 7 GPa using a diamond anvil cell. The exciton absorption is observed in the optical absorption spectrum at ambient pressure. With increasing pressure, the exciton line shifts to the higher energy region. From the shi