2009 年 34 巻 1 号 p. 27-30
We present the behaviors of 90° and 180° domain walls under applying an electric field along the c axis in monoclinic Bi4Ti3O12 crystals. Piezoresponse force microscope investigations taking into account the two spontaneous polarization (Ps) components along the a (Ps(a)) and c (Ps(c)) axes reveal that 90° domain walls composed of the Ps(a) component impede the switching of the Ps(c) domains, leading to a lower remanent polarization along the c axis. 180° domain walls are found to be transformed from a curved configuration into a faceted configuration. These behaviors of Ps(a) domain walls raise the possibility of achieving material design using domain engineering for piezoelectric and optical applications of Bi4Ti3O12