Liquid-Phase Epitaxial Growth of BaTiO_3 Doped (Na_0.5Bi_0.5) TiO_3 Single Crystals on a SrTiO_3 Single Crystal Substrate

摘要

Single crystals of sodium bismuth titanate, (Na,Bi)TiO_3 (NBT), and its solid solutions were grown by a liquid phase epitaxy (LPE) using strontium titanate, SrTiO_3 (ST), isngle crystals as substrates. X-ray diffraction measurements and polarized optical images revealed that the crystals could be epitaxially grown on both the (001) face and the (111) face of the ST substrate. However, due to lattice mismatch, the grown crystals had a multi-domain structure with domain boundaries at both 90 and 180 deg. The NBT crystals grown by using unsealed platinum pan had an inhomogeneous chemical composition, while homogeneous crystals were grown by using sealed platinum capsules for the growth cell. It is concluded from the results of several experiments on inter-diffusion between the substrate and the grown crystal that liquid phase epitaxy is appropriate for the growth of NBT.