Reinvestigation of the crystal structure of Ca 2 Ce 8 (SiO 4 ) 6 O 2 apatite by Rietveld refinement.

Authors :: Massoni N
Hegron R
Campayo L
Source :: Acta crystallographica. Section E, Crystallographic communications [Acta Crystallogr E Crystallogr Commun] 2018 Jun 12; Vol. 74 (Pt 7), pp. 955-959. Date of Electronic Publication: 2018 Jun 12 (Print Publication: 2018).
Publication Year :: 2018
Abstract: Ca <subscript>2</subscript> Ln <subscript>8</subscript> (SiO <subscript>4</subscript> ) <subscript>6</subscript> O <subscript>2</subscript> apatites with Ln = La, Ce, Pr, Nd, Sm, Eu, Gd and Tb crystallize in space group P 6 <subscript>3</subscript> / m . The crystal structure of apatite-type Ca <subscript>2</subscript> Ce <subscript>8</subscript> (SiO <subscript>4</subscript> ) <subscript>6</subscript> O <subscript>2</subscript> [dicalcium octa-cerium hexa-kis-(silicate) dioxide], which has been synthesized by calcination, was refined from powder X-ray diffraction data using the Rietveld method. A database survey shows that contrary to the previously published Ca <subscript>2</subscript> Ce <subscript>8</subscript> (SiO <subscript>4</subscript> ) <subscript>6</subscript> O <subscript>2</subscript> structure [Skakle et al. (2000 ▸). Powder Diffr. 15 , 234-238], the cell volume of the structure reported here is consistent with those of other Ln apatites.

Language :: English
ISSN :: 2056-9890
Volume :: 74
Issue :: Pt 7
Database :: MEDLINE
Journal :: Acta crystallographica. Section E, Crystallographic communications
Publication Type :: Academic Journal
Accession number :: 30002893
Full Text :: https://doi.org/10.1107/S2056989018008435

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