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Raman and Infrared Spectra of YAsO 4
Author(s) -
Pradhan A. K.,
Choudhary R. N. P.,
Wanklyn B. M.
Publication year - 1987
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.2221390134
Subject(s) - raman spectroscopy , anharmonicity , softening , infrared , ion , lattice vibration , crystal (programming language) , materials science , infrared spectroscopy , crystallite , phonon , spectral line , vibration , lattice (music) , crystallography , analytical chemistry (journal) , chemistry , condensed matter physics , optics , physics , organic chemistry , chromatography , quantum mechanics , astronomy , computer science , acoustics , composite material , programming language
Single crystals and polycrystalline specimens of YAsO 4 are prepared by flux method and solid‐state reaction, respectively. Crystal and powder Raman and infrared spectra at 300 K and crystal Raman spectrum at 77 K of YAsO 4 are taken to study the internal and external vibrations of AsO 4 −3 ions. It is found that lattice vibrations with k = 0 associated with the tetrahedra of YAsO 4 are similar to that of DyAsO 4 and SmAsO 4 . The Raman spectrum at 77 K shows slight shifting of phonon lines to higher frequencies due to the decreasing anharmonic interactions of the vibrations. Similarly softening of one of the force constants ( f 4 ) at 77 K in comparison to that of 300 K was observed. Different dosages of X‐ray irradiation produces a very little effect to create defects in the YAsO 4 crystals.