Thermally stimulated depolarization current study of oxygen-vacancy-related relaxation in lead lanthanum zirconate stannate titanate antiferroelectric ceramics
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The oxygen-vacancy-related relaxation behavior in lead lanthanum zirconate stannate titanate antiferroelectric ceramics has been investigated by thermally stimulated depolarization current measurements. These investigations have revealed that two successive peaks with typical characteristics can be obtained in the antiferroelectric ceramics polarized under various polarization and depolarization conditions. The first peak is attributed to defect dipolar orientation. Its dipolar nature corresponding to defect associations composed of oxygen vacancies and lead vacancies may be responsible for the occurrence of the dielectric relaxation at lower temperature. In addition, the second peak is expected to be associated with the relaxation of space charge polarization. The migration of oxygen vacancies is the origin of high temperature relaxation response.
This work was supported by National Natural Science Foundation of China (Grant Nos. 51672157 and 51811530105) and the Ministry of Science and Technology of China through 973-Project (Grant No. 2015CB654604).