An X-ray scattering study of the low-temperature phase transitions of LiKSO<sub>4</sub>
A Desert; A Gibaud; A Righi; U A Leitao; R L Moreira; A Desert; Fac. des Sci., Maine Univ., Le Mans, France; A Gibaud; Fac. des Sci., Maine Univ., Le Mans, France; A Righi; Fac. des Sci., Maine Univ., Le Mans, France; U A Leitao; Fac. des Sci., Maine Univ., Le Mans, France; R L Moreira; Fac. des Sci., Maine Univ., Le Mans, France
Журнал:
Journal of Physics: Condensed Matter
Дата:
1995-10-30
Аннотация:
X-ray diffraction studies on solution-grown LiKSO<sub>4</sub> have been performed between 70 K and 300 K. The lattice parameters have been obtained as a function of the temperature. The hexagonal to trigonal phase transition at 205 K is seen by a slight increase of the c lattice parameter, while the ferroelastic transition at 182 K is accompanied by the appearance of an important spontaneous elastic deformation. The deformation and the domain pattern are analysed via a 'squeezing' model of the hexagonal lattice which leads to a monoclinic lattice below T<sub>c</sub>=182 K.
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