Crystal structure of lanthanum-silicate co-substituted apatite obtained by the mechanochemical synthesis

S. V. Makarova, N. V. Bulina, M. V. Chaikina, L. A. Solovyov

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)61-65
Number of pages5
JournalMaterials Today: Proceedings
Publication statusPublished - 1 Jan 2019
Event5th International Conference on Fundamental Bases of Mechanochemical Technologies (FBMT) - Novosibirsk
Duration: 25 Jun 201828 Jun 2018


  • Co-substituted apatite
  • lanthanum
  • silicate
  • crystal structure
  • Silicate
  • Lanthanum
  • Сo-substituted apatite
  • Crystal structure


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