Temperature transformation of biogenic and synthetic Mg-containing apatite with β-tricalcium-magnesium phosphate (β-TCMP) formation was investigated by X-ray diffraction. Samples were annealed in air at the temperature range from 600 to 1200 °C at intervals 100 °C and cooled down to room temperature. The appearance of β-TCMP was ascertained in samples annealed at 800 °C. As revealed, the relative amount of β-TCMP increases and Mg concentration in this phase decreases as the annealing temperature is raised. While this, the replacement degree of Ca by Mg in the β-TCMP lattice is the annealing temperature function and does not depend either on sample origin (biogenic/synthetic) or on initial Mg concentration. The results of present work together with other investigation data testify to a high thermally activated mobility of Mg both in structure of Mg-containing apatites and in the structure of β-TCMP formed after thermal decomposition. Obtained data can be used for new biomaterials design with varied prolongation of Mg released into the living biological tissue.
S.N. Danilchenko, I.Yu. Protsenko, L.F. Sukhodub, Some features of thermo-activated structural transformation of biogenic and synthetic Mg-containing apatite with ?-tricalcium-magnesium phosphate formation
Cryst. Res. Technol. 44, №5, 553-560 (2009)