2008 年 33 巻 1 号 p. 43-46
Super lattice-structured Bi4Ti3O12- PbBi4Ti4O15 single crystals were grown, and the effects of oxidation and reduction of the polarization hysteresis and leakage current along the a axis were investigated at room temperature. High PO2 annealing gave rise to an increase in leakage current, while annealing in N2 atmosphere yielded a marked decrease in leakage current. These results show that electron hole is the dominant carrier for the leakage current. A well-saturated polarization hysteresis with a remanent polarization of 41 C/cm2 was observed for air-annealed crystals, which is suggested to originate from the peculiar ferroelectric displacement of Bi in the Bi2O2 layers.
