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Hydrothermal Crystallization in the Na2CO3–ZrO2–SiO2–H2O System at 500°C and 0.1 GPa: Na2ZrSi4O11, Na2ZrSi2O7, and Na4Zr2Si3O12 Phase Relations

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Abstract

The phases crystallizing in the Na2CO3–ZrO2(cr)–SiO2(silica gel)–H2O system at 500°C, 0.1 GPa, ZrO2 : SiO2 = 1 : 2 to 1 : 6, and ZrO2 : Na2CO3 = 1 : 1 to 1 : 3 are ZrSiO4 (zircon), Na2ZrSi4O11 (vlasovite), Na2ZrSi2O7 (parakeldyshite), and Na4Zr2Si3O12 (NASICON). The structures of the three Na–Zr silicates are built up of the same polyhedral structural units—M octahedra and T tetrahedra—connected so as to form a three-dimensional MT framework. The crystallization behavior of these phases can be understood in terms of the matrix assembly of crystal structures from suprapolyhedral structural units in the form of cyclic clusters. The structures of Na2ZrSi4O11 and Na2ZrSi2O7 contain invariant six-polyhedron precursors of composition Na2 M 2 T 4, each made up of two ZrO6 octahedra and four SiO4 tetrahedra. The formation of Na4Zr2Si3O12 involves four-polyhedron Na-containing clusters of composition Na2 M 2 T 2.

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  1. Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskii pr. 59, Moscow, 119333, Russia

    G. D. Ilyushin

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Ilyushin, G.D. Hydrothermal Crystallization in the Na2CO3–ZrO2–SiO2–H2O System at 500°C and 0.1 GPa: Na2ZrSi4O11, Na2ZrSi2O7, and Na4Zr2Si3O12 Phase Relations. Inorganic Materials 40, 860–866 (2004). https://doi.org/10.1023/B:INMA.0000037934.80683.8f

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  • DOI: https://doi.org/10.1023/B:INMA.0000037934.80683.8f

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