Space Group Determination of Intermediate Phase of Hexagonal-Type BaTiO₃

抄録

For determining the space group of the intermediate phase (74 K<T<222 K) of hexagonal-type BaTiO₃, X-ray oscillation photographs of a ‘twin-free’ single crystal have been analyzed. Twins which usually occur below 222 K have been successfully eliminated by applying a stress on the crystal. The space group is determined as orthorhombic C222₁-D₂⁵.