Phonon spectra of terbium-doped lutetium orthophosphates

摘要

Raman spectroscopy has been applied to investigations of the effects of substitutionally replacing Lu by Tb in single crystals of the tetragonal, zircon structure host LuPO_(4). Room-temperature, polarized Raman spectra of Lu_(1-x)Tb_(x)PO_(4) (x=0, 0.01, 0.1, and 0.12) have been studied. No appreciable changes in the frequencies of the phonons were observed, indicating that the force fields in the LuPO_(4) lattice are not strongly altered by Tb doping on the Lu site. A discussion of the fluorescence bands and a revised assignment of the LuPO_(4) vibrations are presented.