New Vanadium Doped Calcium Titanate Ceramic Pigment

In this paper a new pink vanadium doped calcium titanate Ca(V(x)T(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(2)V(2)O(7) which dilute the real amount of saturated Ca(V(x)T(1-x))O(3) solid solution and diminish the intensity of colour. The unit cell parameter measurements of Ca(V(x)T(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)T(1-2x))O(3) x = 0.1, 0.2 and 0.3 were prepared and show a brown colour fired 1000 degrees C, but 5% glazed do not produce colour indicating that iron codoping inhibits the pigmenting capacity of vanadium doped CaTiO(3) perovskite. (C) 2011 Elsevier Ltd and Techna Group S.r.l. All rights reserved.