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The crystal structure of Li 2 Mg 2 (Si 4 O 11 ), a loop-branched dreier single chain silicate

The crystal structure of Li 2 Mg 2 (Si 4 O 11 ), a loop-branched dreier single chain silicate Abstract The structure of Li 2 Mg 2 (Si 4 O 11 ) was determined by single crystal X-ray diffraction. It is triclinic, space group P (unk), with a = 8.645(1) Å, b = 7.401(1) Å, c = 6.884(1) Å, α = 104.71(1)°, β = 101.08(1)°, γ = 99.41(1)°, V = 407.5(6) Å 3 and Z = 2. Least -squares refinements based on 1462 observed reflections with intensities I ≥ 3 σ ( I ) resulted in R = 0.054 and R w = 0.036. The main structural elements are chains of corner-linked (SiO 4 ) tetrahedra and ribbons consisting of edge-linked (MgO 6 ) octahedra and (LiO n ) polyhedra. The (SiO 4 ) tetrahedral chain can be described as a loop-branched dreier single chain. This structure type has not been reported for other silicates. Tetrahedral chains and octahedral ribbons are arranged in layers of tetrahedra and octahedra, respectively, which are alternately stacked parallel to (110) and are linked by shared oxygen atoms. This structural arrangement, known from the structures of pyroxenes, pyroxenoids and amphiboles, is compared in detail with that of the closely related pyroxenoid-like dreier single chain silicates. The topology of the tetrahedral-octahedral linkage which occurs at the apical oxygen atoms of the chains is similar to that in serandite, while the linkage with the basal oxygen atoms of the chains is similar to that in wollastonite. Thus, Li 2 Mg 2 (Si 4 O 11 ) represents a new structural member of the family of the pyroxenoid-like single chain silicates. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Zeitschrift für Kristallographie - Crystalline Materials de Gruyter

The crystal structure of Li 2 Mg 2 (Si 4 O 11 ), a loop-branched dreier single chain silicate

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References (1)

  • Bakakin V. V. (1971)

    999

    Sov. Phys. Crystallogr., 15

Publisher
de Gruyter
Copyright
Copyright © 1993 by the
ISSN
2194-4946
eISSN
2196-7105
DOI
10.1524/zkri.1993.204.Part-1.129
Publisher site
See Article on Publisher Site

Abstract

Abstract The structure of Li 2 Mg 2 (Si 4 O 11 ) was determined by single crystal X-ray diffraction. It is triclinic, space group P (unk), with a = 8.645(1) Å, b = 7.401(1) Å, c = 6.884(1) Å, α = 104.71(1)°, β = 101.08(1)°, γ = 99.41(1)°, V = 407.5(6) Å 3 and Z = 2. Least -squares refinements based on 1462 observed reflections with intensities I ≥ 3 σ ( I ) resulted in R = 0.054 and R w = 0.036. The main structural elements are chains of corner-linked (SiO 4 ) tetrahedra and ribbons consisting of edge-linked (MgO 6 ) octahedra and (LiO n ) polyhedra. The (SiO 4 ) tetrahedral chain can be described as a loop-branched dreier single chain. This structure type has not been reported for other silicates. Tetrahedral chains and octahedral ribbons are arranged in layers of tetrahedra and octahedra, respectively, which are alternately stacked parallel to (110) and are linked by shared oxygen atoms. This structural arrangement, known from the structures of pyroxenes, pyroxenoids and amphiboles, is compared in detail with that of the closely related pyroxenoid-like dreier single chain silicates. The topology of the tetrahedral-octahedral linkage which occurs at the apical oxygen atoms of the chains is similar to that in serandite, while the linkage with the basal oxygen atoms of the chains is similar to that in wollastonite. Thus, Li 2 Mg 2 (Si 4 O 11 ) represents a new structural member of the family of the pyroxenoid-like single chain silicates.

Journal

Zeitschrift für Kristallographie - Crystalline Materials – de Gruyter

Published: Jan 1, 1993

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