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On the Structural Phase Transitions in (C 2 H 5 NH 3 ) 2 FeCl 4 . I. Brillouin Scattering

1985; Physical Society of Japan; Volume: 54; Issue: 9 Linguagem: Inglês

10.1143/jpsj.54.3376

1347-4073

Akira Yoshihara, Takashi Suzuki, Tsutomu Yamakami, Tadao Fujimura,

Glass properties and applications

The successive phase transitions in the layered perovskite compound (C 2 H 5 NH 3 ) 2 FeCl 4 have been investigated through Brillouin scattering. The I-II phase transition is characterized by a large dynamical critical behavior and a strong Landau-Khalatnikov contribution to the C 66 elastic constant. In the phases III, IV and V non-critical acoustic dispersion has been observed on the C 11 elastic constant. The present results suggest a tetragonal-orthorhombic-orthorhombic phase sequence for the I, II and III phases.