Reinvestigation of the crystal structure of Ca₂Ce₈(SiO₄)₆O₂ apatite by Rietveld refinement.

ABSTRACT: Ca₂Ln₈(SiO₄)₆O₂ apatites with Ln = La, Ce, Pr, Nd, Sm, Eu, Gd and Tb crystallize in space group P6₃/m. The crystal structure of apatite-type Ca₂Ce₈(SiO₄)₆O₂ [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 Ca₂Ce₈(SiO₄)₆O₂ 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.

SUBMITTER: Massoni N 

PROVIDER: S-EPMC6038630 | biostudies-literature | 2018 Jul

REPOSITORIES: biostudies-literature