ESR Study of Low Temperature Phase Transitions in Se Doped LiKSO₄

Abstract

ESR spectra of γ-ray irradiated LiKSO₄:Se have been measured. The ESR lines of SeO₄⁻ in the room temperature phase split into two branches in the intermediate phase from −75°C to −23°C on heating run and the mirror symmetry appears in the ac plane and the bc plane. The principal values and the directions of the g-tensor have been determined at room temperature and at −60°C on heating run. The results indicate that the space group of the intermediate phase is P31c. A model of the twin structure is discussed.