Acta Cryst. (2003). C59, i120-i124 [doi:10.1107/S0108270103023321]
Abstract: Lithium yttrium orthosilicate oxyapatite [lithium nonayttrium hexakis(silicate) dioxide], LiY9(SiO4)6O2, crystallizes in the centrosymmetric space group P63/m at both 295 and 100 K. The structure closely resembles those of fluorine apatite and sodium yttrium orthosilicate oxyapatite [sodium nonayttrium hexakis(silicate) dioxide], NaY9(SiO4)6O2, which was also investigated, at 270 and 100 K, in this study. There are two different crystallographic sites for the Y3+ ion, which are coordinated by seven and nine O atoms. One-fourth of the nine-coordinated site is occupied by Li or Na atoms, thus maintaining charge balance. The Si atom occupies a tetrahedral site. The two compounds show no symmetry change between room temperature and 100 K, and the alterations in structural parameters are small.
Formula: LiY9(SiO4)6O2 and NaY9(SiO4)6O2
Online 8 November 2003
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