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Selfconsistent Lattice‐Dynamical Theory of Structural Phase Transitions in Perovskite‐Type Crystals
Author(s) -
Pietrass B.
Publication year - 1972
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220530130
Subject(s) - anharmonicity , condensed matter physics , phase transition , lattice (music) , soft modes , perovskite (structure) , landau theory , materials science , physics , ferroelectricity , quantum mechanics , chemistry , crystallography , acoustics , dielectric
The temperature dependence of the soft mode frequency and of the displacement parameter, associated with the structural phase transition in perovskite‐type crystals, is calculated from anharmonic lattice dynamics in a selfconsistent way. The theory describes the change‐over from the Landau‐type behaviour to critical behaviour near the phase transition. For SrTiO 3 and LaAlO 3 good agreement is obtained with the experimental data of Müller and Berlinger.