Lithium and sodium yttrium orthosilicate oxyapatite,LiY9(SiO4)6O2 and NaY9(SiO4)6O2, at both 100 K and near room temperature |
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Authors: | Günther R Redhammer G Roth |
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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. |
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