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Influence of dehydration kinetics on T-O-T bridge breaking in zeolites with framework type STI: The case of stellerite

  • R. Arletti , E. Mazzucato and G. Vezzalini EMAIL logo
Published/Copyright: March 31, 2015
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American Mineralogist
From the journal American Mineralogist Volume 91 Issue 4

Abstract

The thermally induced structural modifications of the natural zeolite stellerite [Ca8Al16Si56O144·58H2O, a = 13.5947(4), b = 18.1823(6), and c = 17.8335(6) Å, V = 4408.1(3) Å3, space group Fmmm, framework type STI] were studied in a temperature-resolved X-ray powder diffraction experiment, using synchrotron radiation, in the temperature range RT-976 K. In the initial stage of heating (below 430 K) Stellerite Phase A (space group Fmmm) is stable, and the cell volume decreases only 0.6% to this temperature. Between 430 and 490 K most of the water is released, the symmetry lowers, and a phase transition to the collapsed so-called Phase B (space group Amma) is observed. In this phase rotation of the 4254 Secondary Building Units causes cell volume contraction and deformation of the channel system. This new phase, at 530 K, shows the statistical breaking of T-O-T bridges in the four-rings and the migration of tetrahedral atoms to new .face-sharing. tetrahedra, which partially occlude both the channels parallel to [100] and to [001]. This framework deformation is interpreted as due to the strain induced by calcium atoms on the framework to achieve better coordination after the release of water. The new structure is stable up to 750 K and the total volume decrease is about 8%. The dehydration process causes a similar framework deformation and the transition to a collapsed phase characterized by the statistical breaking of T-O-T bridges in all zeolites with STI-type frameworks. However, comparing the results obtained with different thermal kinetics, it is possible to assume that the experimental conditions play a primary role in the mechanisms of dehydration and of framework bridge breaking.

Keywords : Zeolite; stellerite; dehydration; X-ray powder diffraction; synchrotron radiation; crystal structure
Received: 2005-4-19
Accepted: 2005-6-17
Published Online: 2015-3-31
Published in Print: 2006-4-1

© 2015 by Walter de Gruyter Berlin/Boston

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https://doi.org/10.2138/am.2006.1966
Keywords for this article
Zeolite; stellerite; dehydration; X-ray powder diffraction; synchrotron radiation; crystal structure

Articles in the same Issue

  1. Structural model for the biogenic Mn oxide produced by Pseudomonas putida
  2. Electron-beam (5–10 keV) damage in triplite-group phosphates: Consequences for electron-microprobe analysis of fluorine
  3. Vacancy defects in MgO at high pressure
  4. Plastic flow of pyrope at mantle pressure and temperature
  5. Parvo-mangano-edenite, parvo-manganotremolite, and the solid solution between Ca and Mn2+ at the M4 site in amphiboles
  6. Reinvestigation of the MgSiO3 perovskite structure at high pressure
  7. The mechanism and kinetics of α-NiS oxidation in the temperature range 670–700°C
  8. Influence of charge location on 29Si NMR chemical shift of 2:1 phyllosilicates
  9. The size distribution of exsolution lamellae in iron-free clinopyroxene
  10. The high-pressure phase transformation and breakdown of MgFe2O4
  11. Elastic behavior, phase transition, and pressure induced structural evolution of analcime
  12. A new chemical etching technique for peridotites using molten anhydrous borax
  13. Poppiite, the V3+ end-member of the pumpellyite group: Description and crystal structure
  14. Cation redistribution in the octahedral sheet during diagenesis of illite-smectites from Jurassic and Cambrian oil source rock shales
  15. A shock-induced polymorph of anatase and rutile from the Chesapeake Bay impact structure, Virginia, U.S.A.
  16. Water in the interlayer region of birnessite: Importance in cation exchange and structural stability
  17. In situ HAFM study of the thermal dehydration on gypsum (010) surfaces
  18. Influence of dehydration kinetics on T-O-T bridge breaking in zeolites with framework type STI: The case of stellerite
  19. Estimation of volume fractions of liquid and vapor phases in fluid inclusions, and definition of inclusion shapes
  20. Thermodynamics of uranyl minerals: Enthalpies of formation of uranyl oxide hydrates
  21. SIMS investigation of electron-beam damage to hydrous, rhyolitic glasses: Implications for melt inclusion analysis
  22. Synthetic Ag-rich tourmaline: Structure and chemistry
  23. Genesis and compositional heterogeneity of smectites. Part III: Alteration of basic pyroclastic rocks—A case study from the Troodos Ophiolite Complex, Cyprus
  24. Ganterite, the barium mica Ba0.5K0.5Al2(Al1.5Si2.5)O10(OH)2, from Oreana, Nevada
  25. Letter. Transformation of pentlandite to violarite under mild hydrothermal conditions
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