Synthesis, Crystal Structure and Physical Properties of Ba4Ti12O27

Polycrystalline sample of the reduced barium titanate Ba4Ti12O27 was prepared by solid state reaction in Ar atmosphere. The magnetic susceptibility was nearly temperature independent in the range of 75-300 K, suggesting the Van Vleck Paramagnetism. The temperature dependence of the electric conductivity does not obey any Arrhenius type behavior.