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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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Peters, Lars
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (6/6 displayed)
- 2024Investigation of Radiation Damage in the Monazite-Type Solid Solution La 1– x Ce x PO 4citations
- 2024Microstructural investigation of Au ion-irradiated Eu-doped LaPO4 ceramics and single crystals
- 2024Investigation of Radiation Damage in the Monazite-Type Solid Solution La1–x Ce x PO4
- 2023Asymmetric rotations and dimerization driven by normal to modulated phase transition in 4-biphenylcarboxy coupled <scp>L</scp>-phenylalaninatecitations
- 2017Orbit and spin resolved magnetic properties of size selected [ConRh](+) and [ConAu](+) nanoalloy clusters
- 2006Structural variations in the solid solution series of sodalite-type |(EuxCa2–x)4(OH)8|[(Al2+xSi1–x)4O24]-SOD with 0 ≤x≤ 1, determined by X-ray powder diffraction and27Al MAS NMR spectroscopycitations
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article
Structural variations in the solid solution series of sodalite-type |(EuxCa2–x)4(OH)8|[(Al2+xSi1–x)4O24]-SOD with 0 ≤x≤ 1, determined by X-ray powder diffraction and27Al MAS NMR spectroscopy
Abstract
<jats:title>Abstract</jats:title><jats:p>The mineral bicchulite, |Ca<jats:sub>8</jats:sub>(OH)<jats:sub>8</jats:sub>|[Al<jats:sub>8</jats:sub>Si<jats:sub>4</jats:sub>O<jats:sub>24</jats:sub>]-<jats:bold>SOD</jats:bold>, has sodalite-(SOD)-type structure. It is one of the few minerals contradicting Loewenstein’s rule, as it contains twice as much Al as Si at the topologically unique tetrahedrally coordinated position, with both species being randomly distributed. The solid solution series |(Eu<jats:sub>x</jats:sub>Ca<jats:sub>2–<jats:italic>x</jats:italic></jats:sub>)<jats:sub>4</jats:sub>(OH)<jats:sub>8</jats:sub>|[(Al<jats:sub>2+<jats:italic>x</jats:italic></jats:sub>Si<jats:sub>1–<jats:italic>x</jats:italic></jats:sub>)<jats:sub>4</jats:sub>O<jats:sub>24</jats:sub>]-<jats:bold>SOD</jats:bold>with 0 ≤<jats:italic>x</jats:italic>≤ 1 and Δ<jats:italic>x</jats:italic>= 0.125, was synthesized in order to clarify, whether the continuous violation of Loewenstein's rule is possible in an aluminosilicate framework structure like SOD, or whether the reported examples of SOD-type compounds with an Al : Si-stoichiometry of 2 : 1 represent a preferred composition on the tetrahedrally coordinated site of the structure. Here, we report on the variation of the lattice parameter and of some structural parameters in the series, determined by X-ray powder diffraction and results of<jats:sup>27</jats:sup>Al MAS NMR spectroscopy. We found Loewenstein's rule to be systematically and continuously violated in this series. The observed structural variations mainly reflect stronger electrostatic interactions between the cage cations and the sodalite framework with increasing (Al + Eu)-content. While the evaluation of the X-ray diffraction data indicate a global adaptation of the sodalite framework to the cage guest size, the significant line-broadening of the NMR spectra with increasing (Al + Eu)-content points towards local adaptations of the framework to the shape of the cage guests.</jats:p>