DEPENDENCE OF RESISTIVITY ON DONOR DOPANT CONTENT IN BARIUM-TITANATE CERAMICS

Barium titanate ceramics doped with yttrium as well as silica and alumina have been studied with special reference to the effects of the yttrium content. An yttrium content at which the ceramics showed a minimum resistivity increased with the increase of the sintering temperature and the added amounts of SiO2·Al2O3. The microstructural studies with the electron probe X-ray microanalyzer revealed that these results should be explained in terms of the grain growth inhibitor effects of yttrium and the segregation of it to grain boundaries. © 1979 The Japan Society of Applied Physics.