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)
(m
2
/g)
(g/cm
3
)
(nm)
1.5
236
2.91
9
1.57
2.5
174
2.94
12
1.65
5.0
99
2.96
21
1.66
7.5
81
3.00
25
1.67
10.0
63
3.03
32
1.67