Selfconsistent Lattice‐Dynamical Theory of Structural Phase Transitions in Perovskite‐Type Crystals | Zendy

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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.

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