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Crystal Structures of Novel Synthesized Potassium Silicates and Aluminosilicates with Rare Earth Elements: K3REESi6O15·nH2O (REE = Tm, Eu) and K2REEAlSi4O12·nH2O (REE = Pr, Tb, Dy)

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Abstract

Silicates of composition K2.75Tm[Si6(O,OH)12]·0.82H2O and K2.61Eu[Si6(O,OH)12]·0.95H2O and aluminosilicates of composition K1.94Pr[AlSi4(O,OH)12]·0.32H2O, K1.98Tb[AlSi4(O,OH)12]·0.32H2O and K1.96Dy[AlSi4(O,OH)12]·0.38H2O were synthesized under hydrothermal conditions. K3REESi6O15·nH2O (REE = Tm, Eu) are orthorhombic, S.G. Pbam, and have the following unit cell parameters: a = 14.850(1) and 14.834(1) Å, b = 15.899(1) and 15.877(1) Å, c = 7.242(1) and 7.243(1) Å, V = 1709.9(1) and 1705.8(1) Å3 for KTm- and KEu-silicate phase, respectively. K2REEAlSi4O12·nH2O (REE = Pr, Tb, Dy) are monoclinic, S.G. C2/c, a = 26.853(1), 26.619(1) and 26.625(1) Å, b = 7.393(1), 7.255(1) and 7.249(1) Å, c = 14.855(1), 14.820(1) and 14.774(1) Å, β = 123.551(1), 123.515(1) and 123.522(1)°, V = 2462.6(2), 2386.3(2) and 2377.2(1) Å3 for KPr-, KTb- and KDy-aluminosilicates, respectively. Eu, Pr, Tb, Dy in the crystal structures have a trivalent state, while Tm has two- and three-valence form.

Graphic Abstract

The article describes the features of the crystal structures and the form of the entry of REE into the synthesized under hydrothermal conditions silicates of composition K2.75Tm[Si6(O,OH)12]·0.82H2O and K2.61Eu[Si6(O,OH)12]·0.95H2O and aluminosilicates of composition K1.94Pr[AlSi4(O,OH)12]·0.32H2O, K1.98Tb[AlSi4(O,OH)12]·0.32H2O and K1.96Dy[AlSi4(O,OH)12]·0.36H2O.

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Acknowledgements

The authors are grateful to Sergey Krivovichev and Maren Pink, who essentially improved the manuscript. The study was performed using the equipment at the Centre of Collective Use (“Isotopic-geochemistry investigations centre” of A.P. Vinogradov Institute of Geochemistry SB RAS and “Baikal analytical center for collective use” of A.E. Favorsky Irkutsk Institute of Chemistry SB RAS). This work was supported by the governmental assignment in terms of Project IX.125.3 (0350-2016-0025) and with Russian Foundation for Basic Research funding (Grant 16-05-00392 A).

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Correspondence to Ekaterina V. Kaneva.

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Kaneva, E.V., Suvorova, L.F. & Tauson, V.L. Crystal Structures of Novel Synthesized Potassium Silicates and Aluminosilicates with Rare Earth Elements: K3REESi6O15·nH2O (REE = Tm, Eu) and K2REEAlSi4O12·nH2O (REE = Pr, Tb, Dy). J Chem Crystallogr 50, 219–224 (2020). https://doi.org/10.1007/s10870-019-00793-6

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