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A model theory of ferroelectric and other structural phase transitions of first and second order
Author(s) -
Albers J.
Publication year - 1979
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.2220910216
Subject(s) - ferroelectricity , phase transition , symmetry (geometry) , condensed matter physics , phase (matter) , order (exchange) , series (stratigraphy) , first order , simple (philosophy) , materials science , taylor series , physics , statistical physics , mathematics , quantum mechanics , mathematical analysis , dielectric , geometry , geology , finance , economics , paleontology , philosophy , epistemology
A model is presented in which the appearance of displacive phase transitions is explained by short‐range internal forces. Electrically charged or uncharged parts of the structure are squeezed out of symmetrical positions and thus lead to a symmetry‐lowering and to phase transitions of ferroelectric or pure structural types. A simple microscopic potential describes transitions of first and second order in good agreement with data of ferroelectric crystals. The Taylor series expansion of this potential allows the comparison with Devonshire's theory.