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Ferroelectric Phase Transition of first Order in BaTiO 3
Author(s) -
Wissel Christian
Publication year - 1971
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.19714820212
Subject(s) - ferroelectricity , condensed matter physics , phase transition , ferroics , materials science , first order , polarization (electrochemistry) , lattice (music) , quantum phase transition , statistical physics , physics , quantum critical point , dielectric , chemistry , mathematics , optoelectronics , acoustics
A microscopic model of BaTiO 3 is treated to describe static phenomena near the ferroelectric phase transition. In addition to the polarization, changes of the lattice constant at fixed pressure are also considered. That leads to a new explanation of the first order character of the transition, which is carried out not only qualitatively but also quantitatively. We investigate the dependence on pressure and external field. Agreement with the experiment through the adjustment of the parameters of the theory is obtained.