Pure silica zeolite-type frameworks: A structural analysis

David S. Wragg, Russell E. Morris, Allen W. Burton

Research output: Contribution to journalArticlepeer-review

63 Citations (Scopus)

Abstract

Since the last major study of silicate crystal structures, many new pure silica zeolite-type frameworks have been discovered. These materials have many interesting properties that are dependent on their structure. We have brought together and analyzed the structures in 35 well-defined frameworks to see how they differ from one another depending on the synthetic route, template, calcination, and composition, and how they differ from the dense silicate phases previously examined. The grand mean values of the Si-O bond distance and the O-Si-O angle are found to be 1.594 angstrom and 109.5 degrees, respectively. The variation and flexibility of the Si-O-Si bond from 133.6 to 180 degrees is discussed, as is the role of fluoride in influencing the O-Si-O bond angles in phases prepared using hydrofluoric acid and ammonium fluoride as mineralizers.

Original languageEnglish
Pages (from-to)1561-1570
Number of pages10
JournalChemistry of Materials
Volume20
DOIs
Publication statusPublished - 26 Feb 2008

Keywords

  • NEGATIVE THERMAL-EXPANSION
  • X-RAY-DIFFRACTION
  • SI-29 MAS NMR
  • STRUCTURE-DIRECTING AGENT
  • SOLID-STATE NMR
  • CRYSTAL-STRUCTURE
  • POWDER DIFFRACTION
  • FLUORIDE IONS
  • ENERGY MINIMIZATION
  • CLATHRASIL PHASE

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