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- W2078461175 abstract "An investigation of the one-step hydrothermal crystallisation of lithium niobates reveals that reaction between Nb2O5 and aqueous LiOH at 240 °C yields materials with a disordered rock-salt structure where the metals are statistically distributed over the cation sites. This contrasts with the well-studied reaction between Nb2O5 and NaOH or KOH that produces ANbO3 (A = Na, K) perovskites. Powder neutron diffraction shows that materials prepared at short reaction times and lower LiOH concentration (2.5 M) are lithium deficient and have a slight excess of niobium, but that at longer periods of reaction in 5 M LiOH, close to the ideal, stoichiometric Li0.75Nb0.25O composition is produced. Upon annealing this phase cleanly transforms into the known ordered rock-salt material Li3NbO4, a process we have followed using thermodiffractometry, which indicates that transformation begins at ∼700 °C. Solid-state 93Nb and 7Li NMR of the disordered and ordered rock-salt phases shows that both contain single metal sites but there is clear evidence for local disorder in the disordered samples. For the ordered material, NMR parameters derived from experiment are also compared to those calculated using density functional theory and are shown to be in good agreement." @default.
- W2078461175 created "2016-06-24" @default.
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- W2078461175 date "2010-01-01" @default.
- W2078461175 modified "2023-09-26" @default.
- W2078461175 title "Disordered lithium niobate rock-salt materials prepared by hydrothermal synthesis" @default.
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- W2078461175 doi "https://doi.org/10.1039/c002190c" @default.
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