New measurements of the Raman spectrum of potassium selenate

1 June 1988

journal article
research article
Published by Taylor & Francis in Ferroelectrics

Vol. 82 (1) , 185-197
https://doi.org/10.1080/00150198808201354

Abstract

The Raman spectrum of K₂SeO₄ has been re-measured at 140 K and 110 K with neon line calibration and numerical fitting of peak frequencies to obtain ±0.1 cm⁻¹ precision. Although the results at 140 K confirm the measurements of the internal mode peak frequencies reported by Unruh which appear to agree with the factor group predictions for the perfect crystal, arguments are presented to show that the orientationally-disordered selenate model still holds. Additional measurements in the incommensurate phase at 110 K revealed line-splitting similar to those reported for infrared spectra; a comparison with those results is given.

Keywords

This publication has 5 references indexed in Scilit:

First-Principles Theoretical Explanation of Incommensurate Behavior in ${Rb}_{2}$ Zn ${Cl}_{4}$
Physical Review Letters, 1986
Persistence up to $T_{i}$ of ferroelectric-phase-allowed modes in the incommensurate phase of $K_{2}$ ${SeO}_{4}$
Physical Review B, 1985
Pseudosymmetry and infrared activity in the incommensurate phase ofA2BX4compounds
Physical Review B, 1984
Interpretation of anomalies in the Raman spectrum of $K_{2}$ Se $O_{4}$ in terms of oxygen sublattice disorder
Physical Review B, 1983
Theoretical lattice-dynamical studies of the incommensurate phase transformation in $K_{2}$ Se $O_{4}$
Physical Review B, 1980