Crystal structure of lanthanum-silicate co-substituted apatite obtained by the mechanochemical synthesis
| Autor: | Marina V. Chaikina, Svetlana V. Makarova, Natalia V. Bulina, L.A. Solovyov |
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| Rok vydání: | 2019 |
| Předmět: |
inorganic chemicals
010302 applied physics endocrine system animal structures Materials science Silicon Inorganic chemistry chemistry.chemical_element 02 engineering and technology Crystal structure 021001 nanoscience & nanotechnology Phosphate digestive system 01 natural sciences Silicate Apatite chemistry.chemical_compound Crystallinity chemistry visual_art 0103 physical sciences Lanthanum visual_art.visual_art_medium Thermal stability 0210 nano-technology |
| Zdroj: | Materials Today: Proceedings. 12:61-65 |
| ISSN: | 2214-7853 |
| Popis: | This paper presents a structural study of lanthanum-silicate co-substituted apatites synthesized by the mechanochemical method. The compositions of the reaction mixtures were taken such that, theoretically, compounds containing equal concentrations of lanthanum and silicon could be formed. As a high degree of crystallinity is required to carry out the refinement of the crystal structure, the synthesized nanosized co-substituted apatites were annealed at 1200 °C. It was found that, in all annealed samples, the concentration of lanthanum is slightly higher than that of silicon. In the structure of the co-substituted apatites, lanthanum occupies both crystallographic positions of calcium with site 2 preference. It was found that the simultaneous replacement of calcium by lanthanum and phosphate by silicate results in an increase in the thermal stability of the compounds in comparison with unsubstituted hydroxyapatite |
| Databáze: | OpenAIRE |
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