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Raman investigations of rare-earth arsenate single crystals

✍ Scribed by G. Barros; C. C. Santos; A. P. Ayala; I. Guedes; L. A. Boatner; C.-K. Loong

Publisher
John Wiley and Sons
Year
2009
Tongue
English
Weight
165 KB
Volume
41
Category
Article
ISSN
0377-0486

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✦ Synopsis

Abstract

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 Β© 2009 John Wiley & Sons, Ltd.

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