STUDY ON THE DIELECTRIC-PROPERTIES OF OXIDE-DOPED BA(TI,SN)O3 CERAMICS PREPARED FROM ULTRAFINE POWDER

Ultrafine BaTiO3 and BaSnO3 powders were prepared by thermal decomposi tion of oxalates through synthesis by the method of co-precipitation; Dy2O3, Nb2O5 and ZnO, used as dopants, were added to the main constitu ents, known as the tailor-made Ba(Ti, Sn)O3, according to the indicate d compositions, then the batches were mixed until they became homogene ous. Careful treatment was necessary in later stages of the process of ceramic making. The dielectric properties of the ceramics were measur ed. It was found that high epsilon, low tan delta and low depsilon/dt were characteristics of these ceramics. The results could be explained by the effects of peak shifting, broadening and grain-size inhibition . The relationship between composition, structure and properties is di scussed.