Ana Mihaela SAVIUC-PAVAL, Ion SANDU, Ionel Marcel POPA, Irina Crina Anca SANDU, Viorica VASILACHE, Ioan Gabriel SANDU<br>Obtaining and Characterization of Ceramic Pigments <br>for Polychrome Artistic Elements II. Microscopic and colorimetric analysis

Ana Mihaela SAVIUC-PAVAL, Ion SANDU, Ionel Marcel POPA, Irina Crina Anca SANDU, Viorica VASILACHE, Ioan Gabriel SANDU
Obtaining and Characterization of Ceramic Pigments
for Polychrome Artistic Elements II. Microscopic and colorimetric analysis

Abstract:

The present paper deals with the microscopic and colorimetric characterization of 18 thermally and photo-resistant pigments, obtained by co-precipitation in an aqueous system, based on phosphate and zinc chromate chromophore structures, chemically doped with Mn(II), Fe(II), Fe(III), Co(II), Ni(II) and Bi(III) cations. The optical microscopic analysis and the measurements of colorimetric parameters (CIE L*a*b*) were done on non-irradiated samples, as well on those irradiated with a UV lamp for 6, 8 and 12 h respectively, after being thermally treated at a temperature of 110oC for 4 h. Despite the fact they start from the same precursor (zinc phosphate and chromate), as a major processing phase in doping with chromophore cations, a large group of ceramic pigments was obtained, with different thermal and photochemical behaviour. Based on the experimental data, the 18 newly synthesized pigments were divided in two groups: those with high stability that can be used to manufacture polychrome elements for mosaics and stained glass and those that can be applied as fritted pigments for oil or water based paints. Keywords: Inorganic pigment; Ceramic; Optical Microscopy; CIE L*a*b* Colorimetry; Photo- and Thermal Stability

Issue: 2012, Volume 63, Issue 2

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