Li, Haijian Kegler, Philip Klepov, Vladislav V. Klinkenberg, Martina Bosbach, Dirk Alekseev, Evgeny V. Comparison of Uranium(VI) and Thorium(IV) Silicates Synthesized via Mixed Fluxes Techniques Two uranium and two thorium silicates were obtained using high temperature mixed fluxes methods. K<sub>14</sub>(UO<sub>2</sub>)<sub>3</sub>Si<sub>10</sub>O<sub>30</sub> crystallizes in the <i>P</i>2<sub>1</sub>/<i>c</i> space group and contains open-branched sechser (six) single silicate chains, whereas K<sub>2</sub>(UO<sub>2</sub>)­Si<sub>2</sub>O<sub>6</sub> crystallizes in the <i>C</i>2/<i>c</i> space group and is built of unbranched achter (eight) silicate chains. The crystals of K<sub>14</sub>(UO<sub>2</sub>)<sub>3</sub>Si<sub>10</sub>O<sub>30</sub> and K<sub>2</sub>(UO<sub>2</sub>)­Si<sub>2</sub>O<sub>6</sub> are related by increasing U/Si molar ratios, and both structures contain the same secondary building units (SBUs), [USi<sub>6</sub>] heptamers. The triangle diagram for all known <b>A<sup>+</sup></b>–UO<sub>2</sub><sup>2+</sup>–SiO<sub>4</sub><sup>4–</sup> phases demonstrates the high polymerization level of silicate groups in the system, which was compared with the family of <b>A<sup>+</sup></b>–UO<sub>2</sub><sup>2+</sup>–BO<sub>3</sub><sup>3–</sup>/BO<sub>4</sub><sup>5–</sup> compounds. For both thorium silicates, the transformation of K<sub>2</sub>ThSi<sub>2</sub>O<sub>7</sub> to K<sub>2</sub>ThSi<sub>3</sub>O<sub>9</sub> was found to be a factor of the reaction time. K<sub>2</sub>ThSi<sub>2</sub>O<sub>7</sub> crystallizes in the <i>C</i>2/<i>c</i> space group and belongs to the Na<sub>2</sub>Si<sup>VI</sup>Si<sub>2</sub>O<sub>7</sub> structure type. Its 3D framework consists of diorthosilicate Si<sub>2</sub>O<sub>7</sub> group and ThO<sub>6</sub> octahedra. Noncentrosymmetric K<sub>2</sub>ThSi<sub>3</sub>O<sub>9</sub> crystallizes in the hexagonal <i>P</i>6<sub>3</sub> space group and adopts mineral wadeite-type structure based upon triorthosilicate Si<sub>3</sub>O<sub>9</sub> rings and ThO<sub>6</sub> octahedra. The coordination environment of thorium for all existing oxo-anion compounds including B, Si/Ge, P/As, Cr/Mo/W, and S/Se/Te are summarized and analyzed. Additionally, spectroscopic properties of all novel materials have been studied. K 2 ThSi 2 O 7;BO;3 D framework;K 2 ThSi 3 O 9;UO 2;Noncentrosymmetric K 2 ThSi 3 O 9 crystallizes;k 2 ThSi 2 O 7 crystallizes;silicate chains;ThO 6 octahedra;thorium silicates;Na 2 Si VI Si 2 O 7 structure type;mineral wadeite-type structure;SBU;3 Si 10 O 30 crystallizes;K 2;3 Si 10 O 30;diorthosilicate Si 2 O 7 group;P 6 3 space group;triorthosilicate Si 3 O 9 rings;Mixed Fluxes Techniques 2018-05-16
    https://acs.figshare.com/articles/journal_contribution/Comparison_of_Uranium_VI_and_Thorium_IV_Silicates_Synthesized_via_Mixed_Fluxes_Techniques/6275894
10.1021/acs.inorgchem.8b01072.s001