Аннотация
The room temperature phonon modes of the isostructural
(Nd,Yb):YxGd1-x(VO4) laser crystals were determined using the Raman
scattering technique, and the observed wavenumbers follow the overall mode distribution expected for REVO4 (RE=rare earth) compounds with the
tetragonal zircon structure, D-4h(19). They were assigned according to
the group theory in terms of the internal modes of the VO4 tetrahedron
and the external modes of the YxGd1-x(VO4) lattice. No appreciable changes in the phonon wavenumbers were observed for Yb:GdVO4 (Yb =
0.008, 0.015, 0.020, 0.025, and 0.035), indicating that the force fields
in the GdVO4 lattice are not strongly altered by Yb doping at the Gd
site. However, most of the phonon wavenumbers in the systems
(Nd,Yb):YxGd1-x(VO4) shifts upwards (one-phonon-like behavior) when Y
replaces for Gd. (C) 2011 Elsevier Inc. All rights reserved.
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