ORIGIN OF THE GRAIN-GROWTH ANOMALY IN DONOR-DOPED BARIUM-TITANATE

The grain growth of donor-doped BaTiO3 prepared from powders with different initial specific surface areas was investigated, and a microscale model was proposed that relates the critical amount of donor-dopant, which inhibits anomalous grain growth, to the critical free surface area at the phase boundary. The results show that the model proposed can explain the inhibition of anomalous grain growth in donor-doped BaTiO3 and can predict well the ratio of critical concentration to surface area for the system studied.