Abstract
Samarium orthosilicate oxyapatite, Sm5(SiO4)3O, contains SiO44− tetrahedra [Si—O 1.611 (7)–1.629 (5) Å] and O2− anions, separated by samarium cations in CN7 [Sm—O 2.2428 (4)–2.641 (7) Å] and CN9 sites [Sm—O 2.428 (5)–2.846 (5) Å]. The full occupancy of the samarium sites implies a mixed valency of four Sm3+ and one Sm2+ per formula unit.
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