Study of Polarization Nonlinearity Near Phase Transitions in Perovskite-Type Ferroelectrics, Using An Anharmonic Oscillator Model,
ARMY FOREIGN SCIENCE AND TECHNOLOGY CENTER CHARLOTTESVILLE VA
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A model of an anharmonic oscillator is applied to a unit cell of the perovskite structure. A microscopic representation for the coefficients A and B in the expansion of the form E AP BP cubed is found by the method of Boguslavskiy, and extended to the paraelectric state of the ferroelectric. Comparison is made with experimental data on the system Ba, Sr TiO3.
- Solid State Physics