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Phase Relations in the Na2CO3–ZrO2–SiO2–H2O System at 0.1 and 0.05 GPa and 450°C

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Abstract

The phase relations in the Na2CO3–ZrO2–SiO2–H2O system were studied at 0.1 and 0.05 GPa and 450°C using large-particle-size and nanocrystalline zirconias. Four silicates were obtained when use was made of readily soluble ZrO2(nanocr): ZrSiO4 , Na2ZrSi6O15 · 3H2O, Na2ZrSi3O9 · 2H2O, and Na4Zr2Si5O16 · H2O. In the system containing poorly soluble ZrO2(cr), only Na2ZrSi6O15 · 3H2O was found to crystallize. It is shown that the structures of all the Na–Zr silicates contain invariant six-polyhedron structural precursors, each made up of two ZrO6 octahedra and four SiO4 tetrahedra, and belong to a homologous series of structures based on the silicate Na2ZrSi2O7, which forms via direct packing of cyclic subpolyhedral precursors.

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  1. Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskii pr. 59, Moscow, 117333, Russia

    G. D. Ilyushin

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Ilyushin, G.D. Phase Relations in the Na2CO3–ZrO2–SiO2–H2O System at 0.1 and 0.05 GPa and 450°C. Inorganic Materials 38, 1249–1257 (2002). https://doi.org/10.1023/A:1021323421240

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