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Abstract
Polycrystalline and epitaxlal films of a layer-structured ferroelectric Bi4Ti3O12 in perovskite phases have been deposited on sapphire substrates by ECR plasma sputtering using a sintering ceramic target. The substrate temperature higher than 550°C is necessary to grow Bi4Ti3O12 films in the perovskite phase without post-thermal annealing. Bi4Ti3O12 films were epitaxially grown on C, A and R surfaces of a sapphire single crystal. Refractive indices of Bi4Ti3O12 films were determined from measurements of the Brewster angle, and the dielectric constant was measured at 1 kHz using an ADEX-221A LCR meter.
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