Abstract
The new mixed-metal Dion-Jacobson layered perovskite RbLaNaNb3O10 has been prepared by direct reaction. Rietveld refinement of X-ray diffraction data shows this compound to be tetragonal (a = 3.88703(7) Å, c = 15.1349(5) Å; S.G. P4/mmm) and isostructural to RbCa2Nb3O10 with La and Na statistically distributed over the A-site within the perovskite block. The compound can be topochemically manipulated, readily undergoing ion exchange reactions to produce the series A′LaNaNb3O10 (A′ = H, Li, Na, K, CuCl). Thermal studies show that, with the exception of KLaNaNb3O10, the exchange products are all low temperature phases, decomposing below 800 °C with a decomposition pathway varying with the nature of the interlayer species. Significant to this study is the observation that the rare combination of site sharing trivalent and monovalent cations (La/Na) imparts an increased stability for the A′LaNaNb3O10 compounds relative to the corresponding A′Ca2Nb3O10 analogues – the thermal stability in LiLaNaNb3O10 for example is over 50 °C higher than that of LiCa2Nb3O10.
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