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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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Bell, Anthony Martin Thomas
Sheffield Hallam University
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (14/14 displayed)
- 2024Atom Probe Tomography Investigation of Clustering in Model P2O5-Doped Borosilicate Glasses for Nuclear Waste Vitrification
- 2023Dynamic high‐temperature crystallization and processing properties of industrial soda–lime–silica glassescitations
- 2021Thermostructural and Elastic Properties of PbTe and Pb0.884Cd0.116Te: A Combined Low-Temperature and High-Pressure X-ray Diffraction Study of Cd-Substitution Effectscitations
- 2021Crystal structures and X-ray powder diffraction data for Cs2NiSi5O12, RbGaSi2O6, and CsGaSi2O6 synthetic leucite analogues
- 2020X-ray Fluorescence Analysis of Feldspars and Silicate Glass: Effects of Melting Time on Fused Bead Consistency and Volatilisationcitations
- 2016Rietveld refinement of the crystal structures of Rb2XSi5O12(X= Ni, Mn)citations
- 2013Synchrotron X-ray powder diffraction study on synthetic Sr-Fresnoitecitations
- 2012High-temperature synchrotron X-ray powder diffraction study of Cs2XSi5O12(X = Cd, Cu, Zn) leucitescitations
- 2010Revision of the structure of Cs2CuSi5O12 leucite as orthorhombic Pbcacitations
- 2010Structural evolution of aqueous mercury sulphide precipitates: energy-dispersive X-ray diffraction studiescitations
- 2009Crystal structures and cation ordering in Cs2MgSi5O12, Rb2MgSi5O12 and Cs2ZnSi5O12 leucitescitations
- 2009Synchrotron X-ray absorption spectroscopy and X-ray powder diffraction studies of the structure of johnbaumite [Ca10(AsO4)6(OH,F)2] and synthetic Pb-, Sr- and Ba-arsenate apatites and some comments on the crystal chemistry of the apatite structure type in generalcitations
- 2008Polymorphism in cyclohexanolcitations
- 2001Chemically induced magnetism and magnetoresistance in La(0.8)Sr(1.2)Mn(0.6)Rh(0.4)O(4).
Places of action
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article
Synchrotron X-ray absorption spectroscopy and X-ray powder diffraction studies of the structure of johnbaumite [Ca10(AsO4)6(OH,F)2] and synthetic Pb-, Sr- and Ba-arsenate apatites and some comments on the crystal chemistry of the apatite structure type in general
Abstract
<jats:title>Abstract</jats:title><jats:p>The chemical composition oft he natural arsenate-apatite mineral johnbaumite [nominally Ca<jats:sub>10</jats:sub>(AsO<jats:sub>4</jats:sub>)<jats:sub>6</jats:sub>(OH)<jats:sub>2</jats:sub>] and its alteration product hedyphane [Ca<jats:sub>4</jats:sub>Pb<jats:sub>6</jats:sub>(AsO<jats:sub>4</jats:sub>)<jats:sub>6</jats:sub>Cl<jats:sub>2</jats:sub>] have been determined by electron microprobe analysis and the structures ofjohnbaumite and synthetic Sr-, Ba- and Pbarsenate apatites have been studied by As K-edge X-ray absorption spectroscopy and synchrotron X-ray powder diffraction. All samples belong to the holosymmetric apatite space group P6<jats:sub>3</jats:sub>/m with As<jats:sup>5+</jats:sup> substituted for P<jats:sup>5+</jats:sup> in the tetrahedral structural site. Johnbaumite contains small amounts ofF and Pb (~0.9 and ~4.4 wt.% respectively) and hedyphane has the ideal composition (formula given above); the compositions of these coexisting phases define the two limbs ofa solvus occurring between Ca- and Pb-arsenate apatite end members. The unit-cell parameters and cation–oxygen bond lengths for the arsenate apatites studied are discussed alongside published data for end-member Ca-, Sr-, Ba- and Pbphosphate apatite analogues with (OH), F, Cl or Br as the anions at the centres of the channels in the apatite structure. This discussion rationalizes the relationships between the two structural sites A(1) and A(2) occupied by divalent cations in terms of the size of the A–O polyhedra and the distortion of the A(1)–O polyhedron as measured by the metaprism twist angle [O(1)–A(1)–O(2) projected onto (001)].</jats:p>