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Title: Synthesis and crystal structures of two polymorphs of Li4–2xMg1+ xTeO6
Authors: Brown, AJ
Liu, JT
Marlton, FP
Avdeev, M
Kennedy, BJ
Ling, CD
Keywords: Neutron diffraction
Honeycomb structures
X-ray diffraction
Tellurium compounds
Crystal structures
Monoclinic lattices
Issue Date: 1-Jul-2020
Publisher: Elsevier
Citation: 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
Abstract: 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.
ISSN: 0022-4596
Appears in Collections:Journal Articles

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