Synthesis and crystal structures of two polymorphs of Li4–2xMg1+ xTeO6
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Two polymorphs of lithium magnesium tellurate Li4–2xMg1+xTeO6 have been prepared by solid-state reactions and their crystal structures characterised by powder X-ray and neutron diffraction. For x ≈ 0, a monoclinic C2/m phase is obtained, structurally similar to other O3 type honeycomb layered tellurate and antimonate compounds. The basic structure consists of [Mg2TeO6]3− honeycomb layers alternating with Li layers, with some anti-site disorder of Li and Mg between layers, analogous to the structure of Li4ZnTeO6. For 0 < x < ~0.5 (specifically, x = 0.33) an orthorhombic Fddd phase is obtained, with a rock-salt superstructure containing disordered Li/Mg cation sites surrounding ordered TeO6 octahedra, analogous to the structure of Li3Co2TaO6.© 2020 Elsevier Inc.
Neutron diffraction, Honeycomb structures, Layers, Oxides, X-ray diffraction, Lithium, Magnesium, Tellurium compounds, Crystal structure, Monoclinic lattices
Brown, A. J., Liu, J., Marlton, F. P., Avdeev, M., Kennedy, B. J., & Ling, C. D. (2020). Synthesis and crystal structures of two polymorphs of Li4–2xMg1+xTeO6. Journal of Solid State Chemistry, 287, 121385. doi:10.1016/j.jssc.2020.121385