Abstract
Single crystals of Ba4Zn2Al2O9 were obtained by heating a mixture of BaCO3, ZnO, and Al2O3 at 1413 K in a dry air atmosphere. X-ray crystal structure analysis revealed that the compound crystalizes in a monoclinic cell (a = 6.9444(2) Å, b = 5.91650(10) Å, c = 13.5842(3) Å, β = 103.955(1)°) with the space group P21/n. The crystal structure can be characterized as a substitution of Zn/AlO4 tetrahedra for B-cation-centered O octahedra of a perovskite-type structure (ABO3). The vacant spaces surrounded by planes of the tetrahedra with eight- and ten-fold coordinations of O atoms are occupied by Ba atoms. The melting temperature (1444 K), electrical conductivity (1.5 × 10–6 S cm–1 at 1073 K), relative permittivity (24 at 298 K and 1 MHz), and linear thermal expansion coefficient (9.72 × 10–6 K–1 at 298–873 K) of a polycrystalline bulk sample were measured.
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