Interaction of Co-ZnO pigments with ceramic frits: a combined study by XRD, FTIR and UV- visible

Autores: Lavat, A.E.|Wagner, C.C.|Tasca, J.E.
Fuente: Ceram. Int.
34 (8), 2147-2153
2008

The development of blue colour when mixed oxides of the system CoxZn1-xO are incoporated, to industrial frits is reported. The Co-ZnO pigments prepared by solid state reaction. A complete series of Co(II) substituting ZN(II) in wurtzite lattice was studied, from the structural point of view, by XRD and FTIR. In order to test these materials as ceramic pigments, 5 and 10 wt% compositions of them were enamelled with three different transparent glazes, respresentative of single and double firing industrial procedures, and then submitted to thermal treatment betwen 750 and 1000º C. The frits, of known composition, were fully characterized by FTIR spectra, prior to the mixing with pigments. The change of colour in the glazes was interpreted analyzing the dependence of the UV-visible electronoic spectra (reflectance) of the samples on the heating temperatures.