Anisotropic compression of a synthetic potassium aluminogermanate zeolite with gismondine topology

Young Nam Jang, Chi Chang Kao, Thomas Vogt, Yongjae Lee

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Compression behaviour of a potassium aluminogermanate with a gismondine framework topology (K-AlGe-GIS) was studied using in-situ high-pressure synchrotron X-ray powder diffraction. In contrast to the potassium gallosilicate analogue (K-GaSi-GIS), no elastic anomaly due to pressure-induced hydration and/or cation relocation was observed in K-AlGe-GIS. The BirchMurnaghan fit to the pressurevolume data results in a bulk modulus of B0=31(1) GPa. The derived linear-axial compressibilities (i.e., βa=0.0065(5) GPa-1, βb=0.0196(4) GPa-1, βc=0.0081(7) GPa-1) indicate that the b-axis, normal to the 8-ring channels, is about three times more compressible than the a and c axes, parallel to the elliptical 8-ring channels. As a consequence a gradual flattening of the so-called 'double crankshaft' structural building units of the gismondine framework is observed. In K-AlGe-GIS, this flattening occurs almost linear with pressure, whereas it is nonlinear in the GaSi-analogue due to structural changes of the watercation assembly under hydrostatic pressures.

Original languageEnglish
Pages (from-to)2305-2308
Number of pages4
JournalJournal of Solid State Chemistry
Volume183
Issue number10
DOIs
Publication statusPublished - 2010 Oct

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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