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)

Autor: Ludmila F. Suvorova, Vladimir L. Tauson, E. V. Kaneva
Rok vydání: 2019
Předmět:
Zdroj: Journal of Chemical Crystallography. 50:219-224
ISSN: 1572-8854
1074-1542
DOI: 10.1007/s10870-019-00793-6
Popis: 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) A, b = 15.899(1) and 15.877(1) A, c = 7.242(1) and 7.243(1) A, V = 1709.9(1) and 1705.8(1) A3 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) A, b = 7.393(1), 7.255(1) and 7.249(1) A, c = 14.855(1), 14.820(1) and 14.774(1) A, β = 123.551(1), 123.515(1) and 123.522(1)°, V = 2462.6(2), 2386.3(2) and 2377.2(1) A3 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. 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.
Databáze: OpenAIRE
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