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Abstract <p>A new uranyl silicate (K<sub>0.67</sub>Rb<sub>0.33</sub>)<sub>2</sub>[(UO<sub>2</sub>)<sub>2</sub>(Si<sub>5</sub>O<sub>13</sub>)](H<sub>2</sub>O) (<b>1</b>) is prepared from the melt in a sealed quartz ampoule. The new compound is orthorhombic, <i>Pbca</i>, <i>a</i>&#xa0;=&#xa0;14.1909(4), <i>b</i>&#xa0;=&#xa0;14.0406(5), <i>c</i>&#xa0;=&#xa0;17.9151(7)&#xa0;Å, <i>V</i>&#xa0;=&#xa0;3569.6(2)&#xa0;Å<sup>3</sup>, <i>R</i>1&#xa0;=&#xa0;0.03. The [Si<sub>5</sub>O<sub>13</sub>]<sup>6–</sup> layers and chains of uranium polyhedra form a microporous heteropolyhedral framework with 9.63×3.34&#xa0;Å channels containing mixed-occupied sites of alkali metal cations. The structure of the new compound is compared with those of related uranyl silicate compounds and minerals.</p>

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New Microporous Framework in the Structure of (K0.67Rb0.33)2[(UO2)2(Si5O13)](H2O)

  • 期刊论文

  • 发表日期：

    2025年4月1日

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  • E. V. Nazarchuk,
  • O. I. Siidra

摘要

Abstract

A new uranyl silicate (K0.67Rb0.33)2[(UO2)2(Si5O13)](H2O) (1) is prepared from the melt in a sealed quartz ampoule. The new compound is orthorhombic, Pbca, a = 14.1909(4), b = 14.0406(5), c = 17.9151(7) Å, V = 3569.6(2) Å3, R1 = 0.03. The [Si5O13]6– layers and chains of uranium polyhedra form a microporous heteropolyhedral framework with 9.63×3.34 Å channels containing mixed-occupied sites of alkali metal cations. The structure of the new compound is compared with those of related uranyl silicate compounds and minerals.