Finally, sample CS_D4 was obtained by using a heating with a ramp of 9 °C/min up to 150 °C. CS_D4 had a translucent appearance and a lower tendency to crumble. However, the relative density is equal to 56% of the theoretical one, i.e. similar to that of sample CS_D3 (Table 1).Therefore, with DT51 and P25 powders, the relative densities of the CSP TiO2 samples did not exceed 62%.