DIELECTRIC-PROPERTIES AND DEFECT STRUCTURE IN LANTHANUM DOPED SRTIO3 CERAMICS

The dielectric properties and positron annihilation lifetime spectra of the ceramics with the nominal composition Sr1-xLaxTiO3 (0 less-than-or-equal-to x less-than-or-equal-to 0.06) were measured. The dielectric properties and relaxation behaviors, which varied obviously with lanthanum content, were explained by a charge compensation model. The defect structure of the materials was further discussed and the above model proved to be reasonable by the positron annihilation study.