層状構造Pb_2Bi_4Ti_5O_<18>単結晶の電気的性質

概要

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Single crystals of lead bismuth titanate(Pb_2Bi_4Ti_5O_<18>)were grown and their electrical properties were investigated by measuring the dielectric permittivity, conductivity and spontaneous polarization. The dielectric permittivity, measured at 1 MHz, was 10400 in the direction parallel to the bismuth layer(crystallographic a(b)-axis)at the Curie temperature of 340℃. This value was about 30 times higher than that in the perpendicular direction(crystallographic c-axis). The DC conductivity was about two orders of magnitude higher in the direction parallel to the bismuth layer than that in the perpendicular direction at 200 to 500℃. A large anisotropy of the ferroelectricity was observed in D-E hysteresis curves at 150℃, and the existence of spontaneous polarization in the c-axis direction was experimentally confirmed, though it was much smaller than that in the a(b)-axis direction. Among the bismuth layer-structured ferroelectrics, Pb_2Bi_4Ti_5O_<18> in the a(b)-axis direction was found to have a low coercive field and a large remanent polarization.
社団法人日本セラミックス協会の論文
1998-03-01