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Buff pigments obtained by introducing colored impurities (Cr 3+ ) in the TiO 2 rutile lattice are usually prepared by solid state synthesis route. The final optical aspect of the material depends mainly on the possibility to observe the formation during the thermal process of a homogeneous solid solution. By looking accurately at the processes occurring during the thermal treatment, it has been demonstrated that the homogeneity of the solid solution depends on the rutilization kinetic of the titanium precursor. The higher the rutilization temperature the better the pigment quality. These technical data have been used to develop a new generation of titanium precursors suitable for high quality pigment manufacturing. |
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