Abstract

The ir lattice spectra of six rare-earth stannates and six rare-earth pyrochlores have been recorded. A factor-group analysis has been performed on the O_h⁷–Fd3m space group. The analysis predicts seven F_1u ir-active modes, and A_1g, E_g, and 4 F_2g Raman-active modes. All the 7 predicted F_1u transverse optic modes have been observed. The highest-frequency band in each spectrum correlates with the unit-cell volume of the crystal; however, the stannate data appear to be anomalous with the previously reported rare-earth garnet data.

© 1971 Optical Society of America

Infrared Lattice Spectra of Rare-Earth Aluminum, Gallium, and Iron Garnets

Neil T. McDevitt
J. Opt. Soc. Am. 59(9) 1240-1244 (1969)

Infrared-absorption characteristics of the pyrochlore structure*

Ronald A. McCauley
J. Opt. Soc. Am. 63(6) 721-725 (1973)

Infrared Lattice Spectra of Cubic Rare Earth Oxides in the Region 700 to 50 cm⁻¹

Neil T. McDevitt and A. D. Davidson
J. Opt. Soc. Am. 56(5) 636-638 (1966)

Optical Phonons in Iron Garnets

P. Grunberg, J. A. Koningstein, and L. G. Van Uitert
J. Opt. Soc. Am. 61(12) 1613-1617 (1971)

Infrared Lattice Spectra of Rare-Earth Iron Garnets

Neil T. McDeviit
J. Opt. Soc. Am. 57(6) 834-834 (1967)