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Published on: January 19, 2019
Alkali-Glass Behavior in Honeycomb-Type Layered Li3-NaNi2SbO6 Solid Solution
Coélio Vallée1, Matthieu Saubanère1,2, Paula Sanz-Camacho2,3
1ICGM, Universite' de Montpellier, CNRS , 34095 Montpellier , France.
Abstract:
Layered oxide compositions Li3-NaNi2SbO6 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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