Abstract
BaTiO 3 ceramics are doped with SiO 2, Nb 2O 5, Dy 2O 3 and LiF and then sintered in various a tomspheres. Electron paramagnetic resonance (EPR) spectroscope is employed to study the possible defects in the BaTiO 3 grain boundary barrier layer (GBBL) capacitors. EPR results suggest the existence of V Ba' defects. V Ba' The enhanced EPR signal at 140°C for undoped BaTiO 3 is due to the increase of V Ba'' vacancies resulting from tetragonal to cubic phase transformation. Neutral V Ba and doubly ionized V ″ Ba vacancies may be present as a result of electron transfer with V Ba. It is argued that diffusion of metal ions affects the oxidation of the grain boundary layer of GBBL BaTiO 3, capacitors.
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