The structure of dehydrated (Li0.7Na0.3)-analcime: Trigonal deformation of the ANA framework and new low coordinated non-framework positions

Seretkin, Yu. V.; Bakakin, V. V.; Bazhan, I. S.

doi:10.1007/s10947-006-0185-z

Cited by 9 publications

(2 citation statements)

References 4 publications

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“…The~7.5% volume contraction observed at the phase transition ( Fig. 3b) is comparable to or slightly greater than the maximum volume discontinuities observed for the ANA structure type [during dehydration of (Li,Na)-bearing and (K,Na)-bearing analcime (Seryotkin et al, 2005;Seryotkin and Bakakin, 2008)]. It is noteworthy that both of these types of analcime undergo the same type of deformation (trigonalization) during dehydration.…”

Section: Elastic Behavioursupporting

confidence: 59%

“…The structural changes described above in HP DA are similar to those that occur when (Li,Na)bearing analcime and (K,Na)-bearing analcime dehydrate at ambient pressure (Seryotkin et al, 2005;Seryotkin and Bakakin, 2008). In both of these compounds, removal of H 2 O molecules from the W sites in large cages allows the migration of some cations into new positions close to 6mRs and trigonalization of the structure.…”

Section: Pressure-induced Transition In Dehydrated Analcimementioning

confidence: 58%

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The deformation mechanism of a pressure-induced phase transition in dehydrated analcime

2012

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The elastic and structural behaviour of dehydrated analcime in compression in a non-penetrating medium up to 3 GPa was studied in a diamond anvil cell using in situ synchrotron powder diffraction. A first-order phase transition at 0.4–0.7 GPa is accompanied by a symmetry change from monoclinic (I2/a) to pseudo-rhombohedral (R3) due to trigonalization of the aluminosilicate framework. This is due to the migration of cations to new positions close to the 6-membered rings forming the channels. The reduction of the mean aperture of the structure-forming 6- and 8-membered rings, as a result of tetrahedral tilting, leads to a 7.5% reduction in volume at the phase transition. The bulk modulus values are 38(2) GPa for the low pressure (LP) phase [fitted with a Murnaghan equation of state, K' = 4 (fixed)] and 11(4) GPa for the high pressure (HP) phase [fitted with a third-order Birch–Murnaghan equation of state, K' = 9(1)]. The elastic behaviour of the LP phase is anisotropic, with compressibilities βa:βb:βc in the ratio 1:4:2; the most compressible direction b coinciding with the orientation of empty 8-membered rings. The compressibility of the HP phase is isotropic. Trigonalization appears to be the most effective (and probably unique) mechanism of radical volume contraction for the ANA structure type.

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Section: Elastic Behavioursupporting

confidence: 59%

Section: Pressure-induced Transition In Dehydrated Analcimementioning

confidence: 58%

The deformation mechanism of a pressure-induced phase transition in dehydrated analcime

2012

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Isomorphous Substitution of Iron and Nickel into Analcime Zeolite

Azizi

Yousefpour

2011

Zeitschrift anorg allge chemie

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Studies on the effects of iron and nickel incorporation into the hydrothermal synthesis of ANA zeolite were carried out. The presented work reveals that pure Fe-Al analcime is synthesized by using starting composition with a higher iron(III) content than reported in previous publications. Furthermore, the iron(III) and nickel(II) contents play important roles in the framework of the synthesized zeolite. 759XRD, FT-IR spectroscopy, diffuse reflectance UV/Vis spectroscopy, nitrogen adsorption and SEM were used to characterize the synthesized zeolites. These investigations showed that loading of iron and nickel ions in ANA zeolite changes the pore size and morphology of analcime zeolite.

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8.1.6.7 Analcime and related silicates

Burzo

2013

Tectosilicates

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The structure of dehydrated (Li0.7Na0.3)-analcime: Trigonal deformation of the ANA framework and new low coordinated non-framework positions

Cited by 9 publications

References 4 publications

The deformation mechanism of a pressure-induced phase transition in dehydrated analcime

The deformation mechanism of a pressure-induced phase transition in dehydrated analcime

Isomorphous Substitution of Iron and Nickel into Analcime Zeolite

8.1.6.7 Analcime and related silicates

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