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Raman investigations of rare‐earth arsenate single crystals
Author(s) -
Barros G.,
Santos C. C.,
Ayala A. P.,
Guedes I.,
Boatner L. A.,
Loong C.K.
Publication year - 2010
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.2497
Subject(s) - raman spectroscopy , tetragonal crystal system , arsenate , rare earth , crystallography , wavenumber , chemistry , lattice (music) , phonon , bond length , tetrahedron , materials science , analytical chemistry (journal) , mineralogy , crystal structure , condensed matter physics , physics , optics , arsenic , organic chemistry , chromatography , acoustics
Polarized Raman spectroscopy was used to investigate the room‐temperature phonon characteristics of a series of rare‐earth arsenate (REAsO 4 , RE = Sm, Eu, Gd, Tb, Dy, Ho, Tm, Yb, and Lu) single crystals. The Raman data were interpreted in a systematic manner based on the known tetragonal zircon structure of these compounds, and assignments and correlations were made for the observed bands. We found that the wavenumbers of the internal modes of the AsO 4 tetrahedron increased with increasing atomic number. This increase seems to be correlated to the contraction of the RE–O bond length. For three out of four lattice wavenumbers observed, this tendency was not nearly so marked as in the case of the internal mode wavenumber. Copyright © 2009 John Wiley & Sons, Ltd.