Refinement of Hexagonal BaTiO3.

Pure single crystals of barium titanate have been synthesized and the structure refined using the atomic coordinates of Burbank & Evans [Acta Cryst. (1948), 1, 330-336]. The short Ti-Ti distance in the face-sharing Ti 2 O 9 group was determined to be 2.690 (4) A, which is significantly shorter than in other barium titanate compounds