Alkali-glass behavior in honeycomb-type layered Li3-xNaxNi2SbO6 solid solution

Abstract : Layered oxide compositions Li3–xNaxNi2SbO6 have been prepared by solid-state synthesis. A complete solid solution is evidenced and characterized by X-ray and neutron diffraction as well as 7Li and 23Na solid-state nuclear magnetic resonance spectroscopy. The transition-metal layer is characterized by the classic honeycomb Ni2+/Sb5+ ordering, whereas a more uncommon randomly mixed occupancy of lithium and sodium is evidenced within the alkali interslab space. In situ X-ray diffraction and density functional theory calculations show that this alkali disordered feature is entropically driven. Fast cooling then appears as a synthesis root to confine bidimensional alkali glass within crystalline layered oxides.
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Submitted on : Tuesday, September 17, 2019 - 10:37:57 AM
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Coélio Vallée, Matthieu Saubanère, Paula Sanz-Camacho, Yohan Biecher, Bernard Fraisse, et al.. Alkali-glass behavior in honeycomb-type layered Li3-xNaxNi2SbO6 solid solution. Inorganic Chemistry, American Chemical Society, 2019, 58 (17), pp.11546-11552. ⟨10.1021/acs.inorgchem.9b01385⟩. ⟨hal-02289822⟩



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