The solution of polarization field strength in ellipsoid and a homogeneous dielectric in condition of a constant external field is obtained with strict derivation and ellipsoidal coordinate.

The solution of polarization field strength in ellipsoid and a homogeneous dielectric in condition of a constant external field is obtained by strict derivation in the use of ellipsoidal coordination.

On the relationship between polarization and charge;

Hysteresis loops of polarizations versus the applied electric field,the butterfly curve of strain versus the applied electric field in a ferroelectric film subjected to a stress field is simulated using the timedependent Ginzburg-Landau equation,which take surface effect into account.

XRD indicates that Lanthanum addition increases (110) and (200) diffraction intensity and decreases the relative intensity of (111) diffraction peak which leads the reduction of coercive field and polarization strength of PZT thin film.

the border relation of polarization intensity and magnetization intensity have been delivered with a method which differs from general electrodynamics literature and bases on microcosmic physical medium model, and this method is in favor of understanding and boundary value relation from point of view of microcosm.

This paper introduces an experimental method for studying the properties of ferroelectric materials by oscilloscope, providing specific procedures for intensity of polarization and electric field in quantitative discussion, with which coertive force and intensity of polarization can then be measured.