Non-Hydrostatic Compression of Zeolite NaA in Water Medium: Connection to Anomalous Conductivity
Full article
| Общее |
Language:
Английский,
Genre:
Full article,
Status:
Published,
Source type:
Original
|
| Journal |
Zeitschrift für Kristallographie
ISSN: 0044-2968
|
| Output data |
Year: 2009,
Volume: 224,
Number: 3,
Pages: 137-143
Pages count
: 7
DOI:
10.1524/zkri.2009.1128
|
| Tags |
Compressibility, High pressure, Over-hydration, Powder diffraction structure analysis, X-ray diffraction, Zeolite NaA |
| Authors |
Likhacheva Anna Yu.
1
,
Malyshev Mikhail E.
2
,
Manakov Andrey Yu.
3
,
Goryainov Sergei V.
1
,
Ancharov Aleksey I.
4
|
| Affiliations |
| 1 |
Institute of Geology and Mineralogy SibD RAS, pr. ac.Koptyuga 3, 630090 Novosibirsk, Russia
|
| 2 |
Boreskov Institute of Catalysis SibD RAS, Novosibirsk, Russia
|
| 3 |
Institute of Inorganic Chemistry SibD RAS, Novosibirsk, Russia
|
| 4 |
Budker Institute of Nuclear Physics SibD RAS, Novosibirsk, Russia
|
|
Funding (4)
|
1
|
Президиум РАН
|
8
|
|
2
|
Russian Foundation for Basic Research
|
06-05-64542
|
|
3
|
Президиум СО РАН
|
43
|
|
4
|
Президиум РАН
|
P-9-3
|
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.