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Discovery at the Interface between Known Structure Types: The Layered Y10NixCu1-xTi4O24 Family
Nataliya L Gulay1, Hai Lin1, Batoul Almoussawi1
1Department of Chemistry, University of Liverpool, Materials Innovation Factory, 51 Oxford Street, LiverpoolL7 3NY, U.K.
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During the exploration of the interface between the known structures of perovskite Y2NiTiO6 and hexagonal layered Y2CuTiO6, we have discovered the new phase Y10NixCu1-xTi4O24 (x = 0, 0.5, 1). The structure of Y10CuTi4O24 was solved by means of single-crystal X-ray diffraction, which revealed a layered monoclinic structure, with the space group C2/m, a = 12.2405(1), b = 5.8643(1), c = 7.1729(1) Å, β = 107.083(1)°. The structures of three Y10NixCu1-xTi4O24 (x = 0, 0.5, 1) phases were also refined based on high-resolution powder X-ray diffraction data. Substitution of Cu for Ni causes only minor changes in lattice and atomic parameters. The new phase is related to known Y5Mo2O12-type structures with an extra atomic position occupied by Ni/Cu in the structure of Y10NixCu1-xTi4O24 (x = 0, 0.5, 1). The high-resolution powder X-ray diffraction data revealed peak broadening for the reflections with l = 2n + 1 corresponding to stacking faults originating from the layered structure of Y10NixCu1-xTi4O24. Y10NixCu1-xTi4O24 (x = 0, 0.5, 1) were characterized with respect to their magnetic and optical properties.
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