In this case, 50 mL of each precipitant with C P = 25 mM were reacted, and the precipitates were dispersed in 200 mL of 10 mM Ca(OH) 2 solutions with initial pH varied in the range 9 -12.5. The particles are compared with those synthesized when pure H 2 O and NaOH solution with initial pH ≈ 6 and 13, respectively, were used in place of Ca(OH) 2 as the growth-inhibiting solution.