FAR-INFRARED REFLECTION SPECTRA OF SILLENITE CRYSTALS AND THEIR SOLID-SOLUTIONS

Authors
SENULIENE D BABONAS G
Citation
D. Senuliene et G. Babonas, FAR-INFRARED REFLECTION SPECTRA OF SILLENITE CRYSTALS AND THEIR SOLID-SOLUTIONS, Physica status solidi. b, Basic research, 180(2), 1993, pp. 541-549
Citations number
20
Categorie Soggetti
Physics, Condensed Matter
Journal title
Physica status solidi. b, Basic research → ACNP
ISSN journal
03701972
Volume
180
Issue
2
Year of publication
1993
Pages
541 - 549
Database
ISI
SICI code
0370-1972(1993)180:2<541:FRSOSC>2.0.ZU;2-P
Abstract
The infrared reflection spectra of sillenite type crystals of Bi12MO20 (M: Si, Ge, Ti, Fe) are measured in the whole range of the first-orde r phonon frequencies and analyzed using the Kramers-Kronig relations. Two-mode behavior is determined for several characteristic modes of Bi 12Si1-xTixO20 and Bi12Ge1-xTixO20 solid solutions. The experimental da ta are discussed in the model of vibrating structural units. The vibra tion frequencies and the force constants for tetrahedra MO, are calcul ated. The calculation results are in good agreement with experimental data for the modes with two-mode behavior.