Abstract
We have investigated the behavior of the Li1.43Cs0.57SO4 single-crystal
Raman spectra and dielectric permittivity as a function of temperature.
It was observed that the crystal, which is an occupationally disordered
system, with orthorhombic C-2v(2) structure at room temperature,
undergoes a phase transition at 230 K. In the new phase the SO4
tetrahedra remain in two non-equivalent sites and there is no evidence
of the doubling of the unit cell. (C) 2003 Elsevier Science Ltd. All
rights reserved.
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