| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Gesing, Thorsten M.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (12/12 displayed)
- 2024Synthesis and characterization of mullite‐type Sn(Cr1-xVx)BO4: Structural, vibrational, magnetic, and thermal properties
- 2023Crystallography at non-ambient conditions and physical properties of the synthesized double-perovskites Sr2(Co1-xFex)TeO6citations
- 2022Effects of iron substitution and anti-site disorder on crystal structures, vibrational, optical and magnetic properties of double perovskites Sr 2 (Fe 1− x Ni x )TeO 6citations
- 2022Effects of iron substitution and anti-site disorder on crystal structures, vibrational, optical and magnetic properties of double perovskites Sr<sub>2</sub>(Fe<sub>1−<i>x</i></sub>Ni<sub><i>x</i></sub>)TeO<sub>6</sub>citations
- 2020Crystal structure of the synthetic analogue of iwateite, Na2BaMn(PO4)2: an X-ray powder diffraction and Raman studycitations
- 2019Characterization of Multiferroic Bi2Mn4O10 by Dielectric and Neutron Spectroscopycitations
- 2019Characterization of Multiferroic Bi 2 Mn 4 O 10 by Dielectric and Neutron Spectroscopycitations
- 2018Effect of the degree of inversion on optical properties of spinel ZnFe2O4
- 2018Disordered but primitive gallosilicate hydro-sodalite: Structure and thermal behaviour of a framework with novel cation distribution
- 2016Bi2Fe4O9: Structural changes from nano- to micro-crystalline statecitations
- 2014Synthesis and characterization of mullite-type (Al1-xGax)4B2O9citations
- 2008Gallium substitution in the alumosilicate framework: synthesis and structural studies of hydro sodalitescitations
Places of action
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article
Gallium substitution in the alumosilicate framework: synthesis and structural studies of hydro sodalites
Abstract
<jats:title>Abstract</jats:title><jats:p>A series of hydro sodalites of composition Na<jats:sub>6</jats:sub>[Al<jats:sub>1−y</jats:sub>Ga<jats:sub>y</jats:sub>SiO<jats:sub>4</jats:sub>]<jats:sub>6</jats:sub>(H<jats:sub>2</jats:sub>O)<jats:sub>8</jats:sub> (0 ≤ <jats:italic>y</jats:italic> ≤ 1) have been prepared from Na<jats:sub>6+x</jats:sub>[Al<jats:sub>1−y</jats:sub>Ga<jats:sub>y</jats:sub>SiO<jats:sub>4</jats:sub>]<jats:sub>6</jats:sub>(OH · H<jats:sub>2</jats:sub>O)<jats:sub>x</jats:sub>(H<jats:sub>2</jats:sub>O)<jats:sub>8−4x</jats:sub> sodalites by NaOH/H<jats:sub>2</jats:sub>O exchange methods carried out in acidic aqueous media. One of the end members (<jats:italic>y</jats:italic> = 1) Na<jats:sub>6</jats:sub>[GaSiO<jats:sub>4</jats:sub>]<jats:sub>6</jats:sub>(H<jats:sub>2</jats:sub>O)<jats:sub>8</jats:sub> is obtained from Na<jats:sub>8</jats:sub>[GaSiO<jats:sub>4</jats:sub>]<jats:sub>6</jats:sub>I<jats:sub>2</jats:sub> by a hydrothermal transformation process. The polycrystalline samples are characterized by Rietveld refinements using X-ray powder diffraction data. The cell parameter fluctuates slightly from the [AlSiO<jats:sub>4</jats:sub>]<jats:sub>6</jats:sub> to the [GaSiO<jats:sub>4</jats:sub>]<jats:sub>6</jats:sub> framework with an average value of 884.8 pm. The occurrence of an almost constant cell parameter has been explained as a combined effect of hydrogen bonding between the oxygen atoms of the entrapped water (or the occluded [Na<jats:sub>3</jats:sub>□(H<jats:sub>2</jats:sub>O)<jats:sub>4</jats:sub>]<jats:sup>3+</jats:sup> complex in the <jats:italic>β</jats:italic>-cage as a whole), and the framework together with six-ring window deformation. During XRD refinements both aluminium and gallium atoms have been converged to a single crystallographic site. The Al/Ga—O bond distance therefore indicates the mean of Al—O and Ga—O distances, which increases with increasing gallium content in the framework. However, the Si—O distance remains almost constant at 162.9 pm at any Ga/Al ratio. The coupled twisting of the (Al,Ga)O<jats:sub>4</jats:sub> and SiO<jats:sub>4</jats:sub> tetrahedra confirms the increase of tilt angles and decrease of six-ring pore dimension upon aluminium replacement by gallium in the framework. Results of <jats:sup>1</jats:sup>H and <jats:sup>29</jats:sup>Si MAS NMR as well as FTIR spectroscopy are also discussed in terms of successive gallium incorporation in the alumosilicate hydro sodalite frameworks.</jats:p>