Syntheses, crystal structures, and comparisons of rare-earth oxyapatites Ca2RE8 (SiO4 )6 O2 (RE = La, Nd, Sm, Eu, or Yb) and NaLa9 (SiO4 )6 O2

Acta Crystallographica. Section E, Crystallographic Communications
Jarrod V CrumBrian J Riley

Abstract

Six different rare-earth oxyapatites, including Ca2RE8(SiO4)6O2 (RE = La, Nd, Sm, Eu, or Yb) and NaLa9(SiO4)6O2, were synthesized using solution-based processes followed by cold pressing and sinter-ing. The crystal structures of the synthesized oxyapatites were determined from powder X-ray diffraction (P-XRD) and their chemistries verified with electron probe microanalysis (EPMA). All the oxyapatites were isostructural within the hexa-gonal space group P63/m and showed similar unit-cell parameters. The isolated [SiO4]4- tetra-hedra in each crystal are linked by the cations at the 4f and 6h sites occupied by RE3+ and Ca2+ in Ca2RE8(SiO4)6O2 or La3+ and Na+ in NaLa9(SiO4)6O2. The lattice parameters, cell volumes, and densities of the synthesized oxyapatites fit well to the trendlines calculated from literature values.

References

Jan 1, 2010·Acta Crystallographica. Section E, Structure Reports Online·Terutoshi SakakuraNobuo Ishizawa
Jul 14, 2018·Acta Crystallographica. Section E, Crystallographic Communications·Nicolas MassoniLionel Campayo

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Citations

Feb 20, 2020·Acta Crystallographica. Section E, Crystallographic Communications·Ryan M KissingerJarrod V Crum

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Methods Mentioned

BETA
neutron powder diffraction

Software Mentioned

SUPERFLIP
TOPAS
EPMA

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