Abstract
The influences of SrBi 2Nb 2O 9 (SBN) on dielectric and ferroelectric properties of (PLZT) ceramics were systematically investigated. X-ray diffraction patterns of PLZT/SBN composite showed that there was no chemical reaction between PLZT and SBN in all cases. SEM pictures on the fracture section revealed a transformation from the transgranular to the intergranular mode with the increase of SBN content in composites. An abnormal and interesting increase of dielectric constant was observed after the incorporation of SBN in PLZT bulks, which could not be explained via the mixing law of dielectrics. Although it turned to be a little shrinkage, hysteresis loops still kept well-formed shapes in PLZT/SBN composites. Compared with the serious degradation of switchable polarization in pure PLZT sample after repeated polarization switching, no apparent decrease of switchable polarization strength was found in PLZT/SBN composites. The improvement mechanism of electric fatigue endurance in PLZT ceramics after SBN incorporation was attributed to the facilitation of oxygen vacancies’ mobility in the bismuth oxide layer in SBN.
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