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Spontaneous polarization behaviour in ferroelectrics
Author(s) -
Wojtczak L.,
Zasada I.
Publication year - 1996
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.2221950226
Subject(s) - pyroelectricity , condensed matter physics , scaling , dielectric , phase transition , polarization (electrochemistry) , curie temperature , ferroelectricity , critical point (mathematics) , critical exponent , hysteresis , materials science , physics , mathematics , chemistry , ferromagnetism , mathematical analysis , geometry , optoelectronics
The spontaneous polarization behaviour in the vicinity of the ferro‐paraelectric phase transition is discussed. The experimental results for ferroelectrics are analyzed in the case of pyroelectric function investigations. The description in terms of the two‐point scaling hypothesis is then applied in order to explain the tail of the polarization in the paraelectric phase. The critical exponents are evaluated. The Curie temperature determined from experimental data above or below the temperature for the maximum of the pyroelectric function is considered in the model assuming that the fixed point can be related to one of the stability points for the ferro‐ or paraelectric phase, respectively. In the model presented the temperature hysteresis seems to be a natural phenomenon because of the phase transition point whose position results from the competition between fluctuations in the ferro‐paraelectric phase coexistence interval.