Acta Cryst. (2002). E58, i70-i71  [ doi:10.1107/S1600536802011868 ]

Samarium orthosilicate oxyapatite, Sm₅(SiO₄)₃O

M. G. Morgan, M. Wang and A. Mar

Abstract: Samarium orthosilicate oxyapatite, Sm₅(SiO₄)₃O, contains SiO₄^4- tetrahedra [Si-O 1.611 (7)-1.629 (5) Å] and O^2- 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.

Online 12 July 2002

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