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Sodium trisilicate: A new high-pressure silicate structure (Na2Si[Si2O7])

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Abstract

Crystals of sodium trisilicate (Na2Si3O7) have been grown in the presence of melt at 9 GPa, 1200 °C using the MA6/8 superpress at Edmonton, and the X-ray structure determined at room pressure (R=2.0%). Na2Si3O7 is monoclinic with a=8.922(2) Å, b= 4.8490(5) Å, c=11.567(1) Å, β=102.64(1)∘ (C2/c), D x = 3.295 g·cm-3. Silicon occurs in both tetrahedral and octahedral coordination ([6]Si∶[4]Si = l∶2). The SiO4 tetrahedra form a diorthosilicate [Si2O7] group and are linked by the isolated SiO6 octahedra via shared corners into a framework of 6-membered ([4]Si-[4]Si-[6]Si[4]Si-[4] Si-[6]Si) and 4-membered ([4]Si-[6]Si-[4]Sr-[6]Si) rings: 〈[6]Si-O〉=1.789 Å, 〈[4]Si-O〉= 1.625 Å, [4]Si-O-[4]Si=132.9∘ and the bridging oxygen is overbonded (s = 2.22). Channels parallel to b-axis and [110] accommodate Na in irregular 6-fold coordination: 〈Na-O〉 = 2.511 Å.

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Authors and Affiliations

  1. Department of Earth Sciences, University of Western Ontario, N6A 5B7, London, Ontario, Canada

    Michael E. Fleet

  2. Department of Geology, University of Toronto, M5S 3B1, Toronto, Ontario, Canada

    Grant S. Henderson

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  1. Michael E. Fleet
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  2. Grant S. Henderson
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Fleet, M.E., Henderson, G.S. Sodium trisilicate: A new high-pressure silicate structure (Na2Si[Si2O7]). Phys Chem Minerals 22, 383–386 (1995). https://doi.org/10.1007/BF00213335

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  • DOI: https://doi.org/10.1007/BF00213335

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