Research Article

The Synthesis of Hydroxyapatite by Hydrothermal Process with Calcium Lactate Pentahydrate: The Effect of Reagent Concentrations, pH, Temperature, and Pressure

Figure 6

SEM images of products obtained in hydrothermal synthesis (Ca2+ concentration of 0.05 mol/dm3, 5 h, pH about 4) for (a) 200°C and 20 bar, (b) 170°C and 10 bar, (c) 150°C and 6 bar, and (d) 130°C and 4 bar (magnification of 2500×).