Non-hydrostatic compression of zeolite NaA in water medium: connection to anomalous conductivity
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Anna Yu. Likhacheva
Abstract
High-pressure synchrotron X-ray powder diffraction measurements of a synthetic zeolite NaA were carried out up to 2.5 GPa using pure water as pressure-transmitting (P) medium to provide non-hydrostatic (wet) conditions in a diamond anvil cell. The compressibility of wet zeolite NaA is similar to that measured at hydrostatic compression in water within the P-range 0–0.8 GPa, whereas between 1–2 GPa the zeolite becomes slightly more compressible and progressively amorphizes due to the non-hydrostatic conditions. Rietveld refinement at 0.37 GPa reveals a selective additional filling of the H2O sites in α- and β-cage, leading to about 30% increase of the total water content. The over-hydrated state of the zeolite is partially preserved after the pressure release. The over-hydration of zeolite pores, combined with a partial disordering at the onset of amorphization, apparently provides necessary conditions for the P-induced enhancement of water-cationic diffusion and the corresponding increase of ionic conductivity observed in zeolite NaA in non-hydrostatic water medium.
© by Oldenbourg Wissenschaftsverlag, München, Germany
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Articles in the same Issue
- Point groups in crystallography
- Non-hydrostatic compression of zeolite NaA in water medium: connection to anomalous conductivity
- Sodium hydrogencarbonate (NaHCO3): coincidence-site lattice twinning and structure refinement
- Crystal chemistry and topology of Rb–MIII molybdates (M = Fe, Sc, In) and triclinic Rb2Mo4O13: novel building blocks, decorated chains and layers
- Structural, spectroscopic and EPR studies of tetraethylammonium tetramethylammonium tetrabomocuprate (II) complex
- Synthesis and structure of [Nd(C6NO2H5)3(H2O)2]2n· (3nHgCl4) · (4nH2O)
- 1,4-diazabicyclo[2.2.2]octane-1,4-diium dihydrogen phosphate monohydrate from X-ray and neutron data
- On the concept of long range order in solids: The use of algorithmic complexity
