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Syntheses, crystal structures, and comparisons of rare-earth oxyapatites Ca2 RE 8(SiO4)6O2 (RE = La, Nd, Sm, Eu, or Yb) and NaLa9(SiO4)6O2.

ABSTRACT: Six different rare-earth oxyapatites, including Ca2 RE 8(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 RE 3+ and Ca2+ in Ca2 RE 8(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.

SUBMITTER: Crum JV 

PROVIDER: S-EPMC6659328 | biostudies-literature | 2019 Jul

REPOSITORIES: biostudies-literature

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Syntheses, crystal structures, and comparisons of rare-earth oxyapatites Ca<sub>2</sub> <i>RE</i> <sub>8</sub>(SiO<sub>4</sub>)<sub>6</sub>O<sub>2</sub> (<i>RE</i> = La, Nd, Sm, Eu, or Yb) and NaLa<sub>9</sub>(SiO<sub>4</sub>)<sub>6</sub>O<sub>2</sub>.

Crum Jarrod V JV   Chong Saehwa S   Peterson Jacob A JA   Riley Brian J BJ  

Acta crystallographica. Section E, Crystallographic communications 20190621 Pt 7

Six different rare-earth oxyapatites, including Ca<sub>2</sub> <i>RE</i> <sub>8</sub>(SiO<sub>4</sub>)<sub>6</sub>O<sub>2</sub> (<i>RE</i> = La, Nd, Sm, Eu, or Yb) and NaLa<sub>9</sub>(SiO<sub>4</sub>)<sub>6</sub>O<sub>2</sub>, 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). A  ...[more]

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