SPONTANEOUS POLARIZATION AND THE DISTRIBUTION OF INTERNAL STRESS ANDELECTRIC FIELDS AROUND A TRIPLE POINT

In this article, distributions of internal stress and internal electric fields around a triple point of ferroelectric polycrystals generated by the spontaneous deformation and spontaneous polarization were investigated. It was found that when all three grains consist of a single domain, the internal stresses and the internal electric fields do not vanish. Though it may be determined according to the principle of energy, the spontaneous configuration will not be unique without involving other conditions due to the symmetry of the crystal structure. Sponsored by National Natural Science Foundation of China(No. 19672053) and Special Funds for Doctoral Programs (No. 96061305).