Abstract
Structures of the low temperature phases of a hexagonal type BaTiO3 were studied by neutron powder diffraction. In addition, high resolution powder diffraction experiments by using SPring-8 synchrotron radiation was carried out in order to determine the symmetry of phase II and III. The unit cell and the space group of phase II was confirmed to be the orthorhombic and C2221. The symmetry in phase III was newly determined as monoclinic with the deformation of the γ-angle by synchrotron radiation. The most possible symmetry in phase III is C1121, or equivalently P1121 as a crystallographic conventional unit cell. The shift patterns of atoms in phase II and phase III were determined.
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