Abstract
The oxygen diffusion coefficients of undoped and La-doped BaTiO3 were evaluated by secondary ion mass spectrometry (SIMS). The La-doped BaTiO3 has markedly lower oxygen diffusion coefficient than the undoped BaTiO3. Regarding the effect of the amount of La doped, the volume diffusion coefficient of oxygen was found to be dependent on the amount of La doped. The oxygen diffusion behavior of samples synthesized by various cooling processes was also compared. The samples that were very slowly cooled (2°C/h from 1250 to 700°C) showed markedly low oxygen diffusion coefficient in the low-temperature region. It was found that the difference in cooling rate during the calcination process has significant effect on the oxygen diffusion behavior of La-doped BaTiO3. Regarding the electrical properties of samples, the dielectric properties were strongly influenced by the cooling rate, whereas the dc resistivities were not influenced by the cooling rate.
Published Version
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