Fig. 3.

Grain sizes (a) and relative densities (b) of β-TCP cylinders after sintering (3 h at 1100 °C) as a function of the Ca/P molar ratio measured by XRD. The colour code represents the phases quantified with the XRD analysis: orange for β-TCP + β-CPP, green for β-TCP and blue for β-TCP + HA. Error bars for the Ca/P molar ratio represent the repeatability (2.77*estimated standard deviation of the Rietveld refinement) while for the grain size it stands for the 99% confidence interval (n = 3; 3000 grains) and for the relative density for the standard deviation (n = 3).