Synthesis, crystal structure and vibrational spectroscopy studies of the lacunar apatite NaPb2Ca2(PO4)3
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Date
2015-05-21
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Publisher
University of Mohammed Premier Oujda in partnership with the Association CEMADES
Abstract
Powder NaPb2Ca2(PO4)3 lacunar apatite was synthesized by the solid-state reaction method, and its crystal
structure was investigated by Rietveld analysis. NaPb2Ca2(PO4)3 material is hexagonal apatite at room
temperature, adopting the space group P63/m (ITA No. 176), a=b=9.6075(2)Å, c=7.0167(1)Å, Z=2. Rietveld
refinements showed that the site 4f is shared by three cations Ca, Pb and Na; while, the 6h is occupied by the Pb and Na cations. The structure can be described as built up from the PO4tetrahedra and the sixfold coordination cavities, which delimit hexagonal tunnels along the c-axis direction. These tunnels are linked by the cations occupying the 4f sites. Raman spectroscopy analysis has been carried out. The observed frequencies were assigned and discussed on the basis of unit-cell group analysis and by comparison to other apatite-type materials.
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Keywords
Crystal structure, Apatites, Raman spectroscopy, Cations, Calcium, Lead, Sodium
Citation
Chari, A., Orayech, B., Faik, A., Igartua, J. M., & El Bouari, A. (2015). Synthesis, crystal structure and vibrational spectroscopy studies of the lacunar apatite NaPb2Ca2(PO4)3. Presented at Workshop Matériaux & Energétique, 21 mai 2015, Casablanca Maroc. In Journal of Materials and Environmetal Science 6(12), 3388-3394.