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Raman scattering study of the upper phase transition in CsScF4

✍ Scribed by A. N. Vtyurin; A. Bulou; A. S. Krylov; I. V. Shmygol; K. S. Aleksandrov

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
87 KB
Volume
31
Category
Article
ISSN
0377-0486

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✦ Synopsis

Effects of the phase transition between the high-temperature tetragonal phases of the CsScF 4 crystal were studied by Raman scattering. The appearance of new lines including a soft mode was observed below the phase transition point, in complete accordance with the new crystal symmetry. The behavior of the soft mode, which corresponds to in-phase rotations of ScF 6 rigid groups around the z -axis (and out-of-phase within perovskite-like layers), resembles that observed earlier in RbAlF 4 , which suggests a similar mechanism of this transition in both crystals.

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