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Stone, Alex H.
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article
Crystal structures and X-ray powder diffraction data for Cs2NiSi5O12, RbGaSi2O6, and CsGaSi2O6 synthetic leucite analogues
Abstract
<jats:p>Leucites are tetrahedrally coordinated silicate framework structures with some of the silicon framework cations partially replaced by divalent or trivalent cations. These structures have general formulae <jats:italic>A</jats:italic><jats:sub>2</jats:sub><jats:italic>B</jats:italic>Si<jats:sub>5</jats:sub>O<jats:sub>12</jats:sub> and <jats:italic>AC</jats:italic>Si<jats:sub>2</jats:sub>O<jats:sub>6</jats:sub>; where <jats:italic>A</jats:italic> is a monovalent alkali metal cation, <jats:italic>B</jats:italic> is a divalent cation, and <jats:italic>C</jats:italic> is a trivalent cation. In this paper, we report the Rietveld refinements of three more synthetic leucite analogues with stoichiometries of Cs<jats:sub>2</jats:sub>NiSi<jats:sub>5</jats:sub>O<jats:sub>12</jats:sub>, RbGaSi<jats:sub>2</jats:sub>O<jats:sub>6</jats:sub>, and CsGaSi<jats:sub>2</jats:sub>O<jats:sub>6</jats:sub>. Cs<jats:sub>2</jats:sub>NiSi<jats:sub>5</jats:sub>O<jats:sub>12</jats:sub> is <jats:italic>Ia</jats:italic><jats:inline-formula><jats:alternatives><jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" mime-subtype="png" xlink:href="S0885715621000580_inline1.png" /><jats:tex-math>${3}$</jats:tex-math></jats:alternatives></jats:inline-formula><jats:italic>d</jats:italic> cubic and is isostructural with Cs<jats:sub>2</jats:sub>CuSi<jats:sub>5</jats:sub>O<jats:sub>12</jats:sub>. RbGaSi<jats:sub>2</jats:sub>O<jats:sub>6</jats:sub> is <jats:italic>I</jats:italic>4<jats:sub>1</jats:sub>/<jats:italic>a</jats:italic> tetragonal and is isostructural with KGaSi<jats:sub>2</jats:sub>O<jats:sub>6</jats:sub>. CsGaSi<jats:sub>2</jats:sub>O<jats:sub>6</jats:sub> is <jats:inline-formula><jats:alternatives><jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" mime-subtype="png" xlink:href="S0885715621000580_inline2.png" /><jats:tex-math>$I{4}3d$</jats:tex-math></jats:alternatives></jats:inline-formula> cubic and is isostructural with RbBSi<jats:sub>2</jats:sub>O<jats:sub>6</jats:sub>.</jats:p>