Abstract
Superlattice-structured Bi4Ti3O12-BaBi4Ti4O15 (BiT-BBTi) ceramics and single crystals were prepared, and their crystal structure and polarization properties were compared with those of constituent BiT and BBTi. The Curie temperature (TC) of the BiT-BBTi crystals was 540°C, which was 40°C higher than that of the BiT-BBTi ceramics with the stoichiometric composition. The BiT-BBTi ceramics had a remanent polarization (Pr) of 12 µC/cm2, while the spontaneous polarization (Ps) along the a axis of the BiT-BBTi crystals was 52 µC/cm2, which was larger than those of BiT and BBTi crystals. The large Ps observed for the BiT-BBTi crystals is suggested to originate from the ferroelectric displacements of the Bi of Bi2O2 layers as well as from the Bi substitution for Ba induced by compositional deviation.
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