Abstract
In this paper a new pink vanadium doped calcium titanate Ca(V x Ti 1− x )O 3 ceramic pigment in conventional ceramic glazes is obtained by ceramic route and characterized. The limit of solid solution is near by x = 0.2, higher amounts of vanadium crystallizes Ca 2V 2O 7 which dilute the real amount of saturated Ca(V x Ti 1− x )O 3 solid solution and diminish the intensity of colour. The unit cell parameter measurements of Ca(V x Ti 1− x )O 3 agrees with the substitution of Ti 4+ by V 5+ that is associated to a V 5+–O charge transfer at 420 nm on UV–vis–NIR spectra of 5% glazed samples that explain the pink colour obtained. In order to avoid the limitation due to the suppressing of oxygen vacancies by high valence cation V 5+ substitution in a Ti 4+ site of CaTiO 3 perovskite for to preserve the charge neutrality of the lattice; Fe 3+ and V 5+ codoped samples Ca(Fe x V x Ti 1−2 x )O 3 x = 0.1, 0.2 and 0.3 were prepared and show a brown colour fired 1000 °C, but 5% glazed do not produce colour indicating that iron codoping inhibits the pigmenting capacity of vanadium doped CaTiO 3 perovskite.
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