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Lattice Vibrations of V 2 O 5 . Determination of TO and LO Frequencies from Infrared Reflection and Transmission
Author(s) -
Clauws P.,
Vennik J.
Publication year - 1976
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.2220760232
Subject(s) - reflection (computer programming) , lattice vibration , dispersion (optics) , single crystal , optics , spectral line , crystal (programming language) , materials science , analytical chemistry (journal) , reflectivity , lattice (music) , kramers–kronig relations , absorption spectroscopy , thin film , vibration , absorption (acoustics) , infrared , chemistry , physics , phonon , nuclear magnetic resonance , condensed matter physics , refractive index , chromatography , astronomy , quantum mechanics , computer science , acoustics , nanotechnology , programming language
The reflectance of V 2 O 5 , single crystals is measured between 20 and 2000 cm −1 . Eleven resonances are observed: six with E ∥ a , two with E ∥ b , and three with E ∥ c . Values of ϵ 0 are obtained separately from thin crystal channel spectra: ϵ 0 = 37.2 with E ∥ a and 20.1 with E ∥ c . The reflectance data are analysed by Kramers‐Kronig integration, classical dispersion analysis, and four‐parameter dispersion analysis, all three methods yielding comparable results. Additional transmission measurements of thin single crystals and powders are performed. For the thin single crystal, absorption peaks at 982 and 1038 cm −1 are observed which are assigned to direct absorption of a TO and a LO vibration.