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In dielectric crystals in the unit cell structure to make positive and negative, of the Centre of gravity do not coincide the occurrence of electric dipole moment, the polarization is not equal to zero intensity, so that crystals with spontaneous polarization, such properties of ferroelectric Crysta

In some dielectric medium crystal, the unit cell structure causes the positive and negative electric charge center of gravity not to superpose appears the dipole moment, produces was not equal to the zero the electric polarization, enable the crystal to have the spontaneous polarization, crystal thi

In some dielectric crystals, crystal cells in the structure, which will enable focus plus or minus charge does not coincide with electric dipole moments of electric polarization, which does not mean zero strength, so that crystals, crystals have a spontaneous polarization of this nature is called Fe

In dielectric crystals in the unit cell structure to make positive and negative, of the Centre of gravity do not coincide the occurrence of electric dipole moment, the polarization is not equal to zero intensity, so that crystals with spontaneous polarization, such properties of ferroelectric Crysta