Influence of content of pressure-transmitting medium on structural evolution of heulandite: Single-crystal X-ray diffraction study

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Abstract

The structural evolution of natural heulandite Ca2.90Na2.07Sr0.25K0.16Ba0.06(H2O)n[Al8.65Si27.35O72] was studied upon compression in penetrating (water-containing) and non-penetrating (paraffin) media using single-crystal X-ray diffraction data in a diamond-anvil cell. Compression in a water-containing medium results in an additional hydration of heulandite from 23 molecules per unit cell at ambient conditions to ≈27 at 3.27 GPa. Water molecules enter both initially vacant and partly occupied positions. Additional hydration stabilizes the crystal structure decreasing its compressibility.

Original languageEnglish
Pages (from-to)127-135
Number of pages9
JournalMicroporous and Mesoporous Materials
Volume214
DOIs
Publication statusPublished - 28 May 2015

Keywords

  • Crystal structure
  • Heulandite
  • High pressure
  • Hydration
  • Zeolite

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