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Abstract
The orthorhombic to monoclinic phase transition in CsLiSO4 and CsLiCrO4 has been studied with X-ray diffraction to clarify the mechanism of the phase transition. Temperature dependence of lattice constants and integrated intensity of Bragg reflection (h0l) has been measured. It is concluded that CsLiSO4 is a ferroelastic crystal with single order parameter. On the other hand, CsLiCrO4 is a ferrielastic crystal with two kinds of sublattice order parameters originating from Cs sublattice and CrO4 sublattice.