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Letter. Porous titanosilicate nanorods in the structure of yuksporite, (Sr,Ba)2K4(Ca,Na)14(⃞,Mn,Fe) {(Ti,Nb)4(O,OH)4[Si6O17]2[Si2O7]3}(H2O,OH)n, resolved using synchrotron radiation
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Sergey V. Krivovichev
,
Viktor N. Yakovenchuk
Veröffentlicht/Copyright:
28. März 2015
Abstract
The crystal structure of yuksporite, (Sr,Ba)2K4(Ca,Na)14(⃞ ,Mn,Fe){(Ti,Nb)4(O,OH)4[Si6O17]2[Si2O7]3}(H2O,OH)n, where n ∼ 3 [monoclinic, P21/m, a = 7.126(3), b = 24.913(6), c = 17.075(7) Å, β = 101.89(3)°, V = 2966.4(17) Å3] has been solved using X-ray synchrotron radiation data collected from a needle-like crystal with dimensions of 6 × 6 × 50 µm3 at the Swiss-Norwegian beamline BM01 of the European Synchrotron Research Facility (ESRF, Grenoble, France). The structure was refined to R1 = 0.101 on the basis of 2359 unique observed reflections with |Fo| ≥ 4σF. The structure of yuksporite is based upon titanosilicate nanorods elongated along a and with an elliptical cross-section of ca. 16 × 19 Å = 1.6 × 1.9 nm. Silicate tetrahedra form double xonotlite-like chains 1∞[Si6O17] oriented parallel to (001). Two 1∞[Si6O17] chains are linked into a rod via TiO6 octahedra and Si2O7 double tetrahedra. The {(Ti,Nb)4(O,OH)4[Si6O17]2[Si2O7]3} nanorods are porous. The internal pores are defined by eight-membered rings (8MR) with open diameters of 3.2 Å. The interior of the titanosilicate nanorods is occupied by Sr, Ba, K, and Na cations and H2O molecules. The nanorods are separated by walls of Ca coordination polyhedra that are parallel to (010) and link the rods into a three-dimensional structure.
Received: 2004-2-6
Accepted: 2004-5-25
Published Online: 2015-3-28
Published in Print: 2004-10-1
© 2015 by Walter de Gruyter Berlin/Boston
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Artikel in diesem Heft
- The origin of the color of pearls in iridescence from nano-composite structures of the nacre
- “Invisible„ gold revealed: Direct imaging of gold nanoparticles in a Carlin-type deposit
- Behavior of cation vacancy in kenotetrahedral Cr-spinels from Albanian eastern belt ophiolites
- Displacement and strain fields around a [100] dislocation in olivine measured to sub-angstrom accuracy
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- Determination of standard thermodynamic properties of sulfides in the Ag-Au-S system by means of a solid-state galvanic cell
- Hydroxyl ordering in igneous apatite
- Accommodation of the carbonate ion in apatite: An FTIR and X-ray structure study of crystals synthesized at 2–4 GPa
- Mg/Si ratios of aqueous fluids coexisting with forsterite and enstatite based on the phase relations in the Mg2SiO4-SiO2-H2O system
- The activity of silica, water, and the equilibration of intermediate and silicic magmas
- The CO2–H2O system: IV. Empirical, isothermal equations for representing vapor-liquid equilibria at 110–350 °C, P ≤ 150 MPa
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