A Molecular Composite between Partially Hydrolyzed Aluminum Cations and a Layered Calcium Niobate Perovskite

S. Hardin, D. Hay, M. Millikan, J. V. Sanders, T. W. Turney

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The layered perovskite (C4H9NH3)Ca2Nb3O10with an interlayer spacing d001= 2.51 nm reacts with solutions containing oligomeric aluminum hydroxycations to produce a single-phase, partly ordered composite material with an interlayer spacing d001= 2.9 nm, which contracts to d001= 2.0 nm on heating to 300 °C. Elemental analysis yields compositions in the range [Al1.67(OH)4(H2O)1.67][Ca2Nb3O10] to [Al3.06(OH)8.18(H2O)2.39]-[Ca2Nb3O10]. The materials decompose on heating, finally yielding a mixture of phases, including AlNbO4and CaNb2O6, at 1200 °C. Thermogravimetric analysis, surface area measurements, XRD, electron diffraction, high-resolution TEM, and 93Nb and27 Al NMR studies suggest the presence of structurally unaltered Ca2Nb3O10layers with an interlayer region “stuffed” by a layer of polymeric Al hydroxycations.

Original languageEnglish
Pages (from-to)977-983
Number of pages7
JournalChemistry of Materials
Issue number5
Publication statusPublished - 1 Sep 1991
Externally publishedYes

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