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Far Infrared Reflection Spectra of Sillenite Crystals and Their Solid Solutions
Author(s) -
Senulienè D.,
Babonas G.
Publication year - 1993
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221800225
Subject(s) - reflection (computer programming) , infrared , tetrahedron , infrared spectroscopy , spectral line , phonon , materials science , solid solution , kramers–kronig relations , far infrared , normal mode , vibration , analytical chemistry (journal) , condensed matter physics , optics , crystallography , chemistry , physics , refractive index , optoelectronics , quantum mechanics , programming language , computer science , metallurgy , chromatography
The infrared reflection spectra of sillenite type crystals of Bi 12 MO 20 (M :Si, Ge, Ti, Fe) are measured in the whole range of the first‐order phonon frequencies and analyzed using the Kramers‐Kronig relations. Two‐mode behavior is determined for several characteristic modes of Bi 12 Si 1− x Ti x O 20 and Bi 12 Ge 1− x Ti x O 20 solid solutions. The experimental data are discussed in the model of vibrating structural units. The vibration frequencies and the force constants for tetrahedra MO 4 are calculated. The calculation results are in good agreement with experimental data for the modes with two‐mode behavior.