The effect of colloidal silica (SiO2; CS) addition on the formation of porous spherical α-calcium orthophosphate (α-Ca3(PO4)2; α-TCP) agglomerates has been examined. The starting powder was prepared by the spray pyrolysis of calcium phosphate (Ca/P ratio = 1.50) solution containing 0.9 mol•dm -3 Ca(NO3)2, 0.6 mol•dm -3 (NH4)2HPO4, CS (mean particle size; 14, 24 and 39 nm) and concentrated HNO3 at 600°C, using an air-liquid nozzle; the amounts of CS in the spray-pyrolyzed powder were adjusted to be 0
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