Table 1: Effect of the microwave radiation time on the material specific surface area, the density, the grain size calculated on the basis of SSA measurements, and the Ca/P ratio established by the ICP-OES measurements.

Radiation time SSA Density Grain size Ca/P
(min)(m2/g)(g/cm3)(nm)

1.52362.9191.57
2.51742.94121.65
5.0992.96211.66
7.5813.00251.67
10.0633.03321.67