Orientational phase transition in LiKSO4

Abstract
Raman scattering results on low-lying external modes in LiKSO4 across the phase transition C66C3v4 (Tc=201 K) are presented. Based on these data and the lattice-dynamical calculations of Chaplot, Rao, and Roy it is shown that reorientation of SO42 ions at the phase transition is likely to take place about an axis normal to the c axis.