1. Synthesis and crystal structures of two polymorphs of Li4–2xMg1+xTeO6.
- Author
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Brown, Alex J., Liu, Jiatu, Marlton, Frederick P., Avdeev, Maxim, Kennedy, Brendan J., and Ling, Chris D.
- Subjects
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CRYSTAL structure , *TELLURIUM oxides , *X-ray powder diffraction , *PHASE space , *NEUTRON diffraction , *HONEYCOMB structures - Abstract
Two polymorphs of lithium magnesium tellurate Li 4–2 x Mg 1+ x TeO 6 have been prepared by solid-state reactions and their crystal structures characterised by powder X-ray and neutron diffraction. For x ≈ 0, a monoclinic C 2/ m phase is obtained, structurally similar to other O3 type honeycomb layered tellurate and antimonate compounds. The basic structure consists of [Mg 2 TeO 6 3− honeycomb layers alternating with Li layers, with some anti-site disorder of Li and Mg between layers, analogous to the structure of Li 4 ZnTeO 6. 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 TeO 6 octahedra, analogous to the structure of Li 3 Co 2 TaO 6. Figure caption : XRD pattern and illustration of the crystal structure of the O3-type monoclinic phase obtained for x ≈ 0 of the Li 4–2 x Mg 1+ x TeO 6 phase space. Image 1 • Layered oxides; Honeycomb; Neutron diffraction; polymorphs. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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