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Phase Relations in the Systems LiOH–GeO2–H2O and LiOH–SiO2–H2O at 500°C and 0.1 GPa

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Abstract

Crystallization in the LiOH–GeO2–H2O and LiOH–SiO2–H2O hydrothermal systems was studied at 500°C and 0.1 GPa. The systems were shown to contain both the isostructural compounds Li2SiO3 and Li2GeO3 and phases differing in crystal chemistry: Li2Si2O5, Li2Ge3O6(OH)2, and Li3HGe7O16 · 4H2O (containing Ge in different oxygen coordinations). The crystallization fields revealed in the germanate system are (in order of increasing LiOH concentration) GeO2 ⇒ GeO2+ Li2Ge3O6(OH)2 ⇒ Li2Ge3O6(OH)2 + Li2GeO3⇒ Li3HGe7O16 · 4H2O + Li2GeO3; those in the silicate system are α-SiO2 ⇒ α-SiO2+ Li2Si2O5 ⇒ Li2Si2O6 + Li2SiO3 ⇒ Li2SiO3. Increasing the LiOH concentration increases the number of Li atoms per tetrahedrally coordinated Si or Ge atom in the crystallizing compounds. The high stability of Li2Ge3O6(OH)2 is interpreted in terms of the matrix assembly of the structure from cyclic invariant subpolyhedral structural units.

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

    G. D. Ilyushin & L. N. Dem'yanets

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  1. G. D. Ilyushin
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  2. L. N. Dem'yanets
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Ilyushin, G.D., Dem'yanets, L.N. Phase Relations in the Systems LiOH–GeO2–H2O and LiOH–SiO2–H2O at 500°C and 0.1 GPa. Inorganic Materials 38, 700–708 (2002). https://doi.org/10.1023/A:1016244526014

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