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The new oxosilicate NaTbSi2O6: A comparison of its A- and D-type structure

  • Marion C. Schäfer , Sabine Zitzer and Thomas Schleid
Published/Copyright: April 18, 2012
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Zeitschrift für Kristallographie - Crystalline Materials
From the journal Volume 227 Issue 7

Abstract

Two different modifications of the composition NaTbSi2O6 were synthesized within the class of quaternary alkali-metal rare-earth metal(III) oxosilicates. Monoclinic NaTbSi2O6 (A-type structure: space group P21/c (no. 14); a = 542.57(4), b = 1376.54(9), c = 762.83(5) pm, β = 110.086(3)°, Vm = 80.557(9) cm3/mol, Z = 4) crystallizes isotypically with NaYSi2O6 und LiScSi2O6. In this ino-oxosilicate, the [SiO4]4– tetrahedra are vertex-shared and linked to form infinite zigzag chains ∞1{[SiO2/2vO2/1t]2–} along [001]. Both, the Na+ and the Tb3+ cations are coordinated by seven O2– anions each. The [TbO7]11– polyhedra get connected via trans-oriented edges to build up ∞1{[TbO4/2eO3/1t]7–} chains running along [001], which alternate with the ∞1{[SiO2/2vO2/1t]2–} chains. In contrast, triclinic NaTbSi2O6 with a novel D-type structure (space group: P-1 (no. 2), a = 549.41(4), b = 938.65(6), c = 972.30(7) pm, α = 117.263(2), β = 97.239(2), γ = 99.676(2)°, Vm = 85.798(9) cm3/mol, Z = 3) belongs to the cyclo-oxosilicates according to Na3Tb3[Si6O18] with Z = 1. The arrangement of the resulting corrugated six-membered [Si6O18]12– rings of vertex-shared [SiO4]4– tetrahedra is similar to a hexagonal closest packing parallel to (100). The two types of distorted [TbO6]9– octahedra are linked along [010] via common edges to form undulated infinite ∞1{[TbO4/2vO2/1t]5–} chains, which become alternatingly piled with the cyclo-[Si6O18]12– units and the incorporated Na+ cations along [010]. While the square-pyramidally coordinated (Na2)+ cations are situated between the isolated cyclo-oxohexasilicate anions, the sixfold coordinated (Na1)+ cations can be found inside the rings. They are therefore surrounded by the six bridging O2– anions of the cyclo-[Si6O18]12– units in a quasi-planar hexagonal coordination sphere.

Keywords: Terbium; Silicates; Two structure-types; Single crystal structure analysis; X-ray diffraction
* Correspondence address: University of Delaware, Department of Chemistry and Biochemistry, 19716 DE, Newark, U.S.A.,
Published Online: 2012-04-18
Published in Print: 2012-07

© by Oldenbourg Wissenschaftsverlag, München, Germany

Articles in the same Issue

  1. Friedrich Liebau (1926–2011) Memorial
  2. On the symmetry and atomic ordering in (OH,F)-rich spessartine: towards a new hydrogarnet end-member
  3. Structural and 57Fe Mössbauer spectroscopic characterization of the synthetic NaFeSi2O6 (aegirine) – CaMgSi2O6 (diopside) solid solution series
  4. A neutron/X-Ray diffraction, IR, and 1H/29Si NMR Spectroscopic investigation of armenite: behavior of extra framework Ca cations and H2O molecules in microporous silicates
  5. RUB-55, a new hydrous layer silicate with silicate layers known as motives of the sodalite and octadecasil frameworks: Synthesis and crystal structure
  6. Crystal structure and morphology of fully hydrated zeolite Na-A
  7. A new borosilicate feldspar, KBSi3O8: synthesis, crystal structure and thermal behavior
  8. The crystal structure of aklimaite, Ca4[Si2O5(OH)2](OH)4 · 5 H2O
  9. The [9]-coordinated X site in the crystal structure of tourmaline-group minerals
  10. Crystal structure of 2M and 1A polytypes of balangeroite
  11. Twinnite, Pb0.8Tl0.1Sb1.3As0.8S4, the OD character and the question of its polytypism
  12. The new oxosilicate NaTbSi2O6: A comparison of its A- and D-type structure
  13. K2Ba5Si12O30 – a member of a homologous series among layered potassium barium silicates
  14. Synthesis and structures of two open-framework manganese phosphate-silicates
  15. Glass structural studies for borosilicates of the KBSi2O6—RbBSi2O6 system from X-ray diffraction data
https://doi.org/10.1524/zkri.2012.1508
Keywords for this article
Terbium; Silicates; Two structure-types; Single crystal structure analysis; X-ray diffraction

Articles in the same Issue

  1. Friedrich Liebau (1926–2011) Memorial
  2. On the symmetry and atomic ordering in (OH,F)-rich spessartine: towards a new hydrogarnet end-member
  3. Structural and 57Fe Mössbauer spectroscopic characterization of the synthetic NaFeSi2O6 (aegirine) – CaMgSi2O6 (diopside) solid solution series
  4. A neutron/X-Ray diffraction, IR, and 1H/29Si NMR Spectroscopic investigation of armenite: behavior of extra framework Ca cations and H2O molecules in microporous silicates
  5. RUB-55, a new hydrous layer silicate with silicate layers known as motives of the sodalite and octadecasil frameworks: Synthesis and crystal structure
  6. Crystal structure and morphology of fully hydrated zeolite Na-A
  7. A new borosilicate feldspar, KBSi3O8: synthesis, crystal structure and thermal behavior
  8. The crystal structure of aklimaite, Ca4[Si2O5(OH)2](OH)4 · 5 H2O
  9. The [9]-coordinated X site in the crystal structure of tourmaline-group minerals
  10. Crystal structure of 2M and 1A polytypes of balangeroite
  11. Twinnite, Pb0.8Tl0.1Sb1.3As0.8S4, the OD character and the question of its polytypism
  12. The new oxosilicate NaTbSi2O6: A comparison of its A- and D-type structure
  13. K2Ba5Si12O30 – a member of a homologous series among layered potassium barium silicates
  14. Synthesis and structures of two open-framework manganese phosphate-silicates
  15. Glass structural studies for borosilicates of the KBSi2O6—RbBSi2O6 system from X-ray diffraction data
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