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Synthesis of the apatite with a blend of the powder of calcite

Rachida Elosrouti, Brahim Sallek

We have studied the influence of residence time in a humid atmosphere on the synthesis of apatitic phosphate calcium. The initial atomic ratio of calcium to phosphorus Ca/P is constant and equal to 1.00 ± 0.01. The XRD analysis has shown the formation of a poorly crystalline calcium phosphate with an apatitic structure. Beyond 48 hours only the hydroxyapatite phase was found. For cons, a treatment of a mixture during the residence time that is less than 48 hours led to the formation of amixture of hydroxyapatite and calciumcarbonate (calcite). Similarly, the infrared absorption spectroscopy for short residence times ranging from 2h to 8h still shows the presence of bands due to ions CO3 2- specific calcite that decrease by increasing the residence time. Beyond a residence time of 48 hours there was a total disappearance of these band and chemical analysis by the atomic shows that the ratio Ca/P remains practically constant and equal to 1.60 ± 0.01.