Infrared and Raman spectra of polycrystalline Y2O3 as well as polarized Raman spectra of Y2O3 single crystals have been measured. A complete assignment of the bands is proposed. A normal coordinate analysis using a generalized valence force field enabled us to fit the observed frequencies with a satisfactory accuracy (3.5%). The calculated force constants are discussed and compared with those of alpha-Al2O3 exhibiting the same atomic coordination. (C) 1995 Academic Press, Inc.
机构:
Tunis El Manar Univ, Fac Sci Tunis, Unite Phys Dispositifs Semicond, Tunis 2092, Tunisia
Univ Gafsa, Fac Sci, Campus Univ Sidi Ahmed Zarroug, Gafsa, TunisiaTunis El Manar Univ, Fac Sci Tunis, Unite Phys Dispositifs Semicond, Tunis 2092, Tunisia
Larbi, Tarek
El-Kelany, Khaled E.
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Kafrelshiekh Univ, Inst Nanosci & Nanotechnol, Kafrelskiekh, Egypt
Menia Univ, Fac Sci, Chem Dept, CompChem Lab, El Minia, EgyptTunis El Manar Univ, Fac Sci Tunis, Unite Phys Dispositifs Semicond, Tunis 2092, Tunisia