Preparation
and practical application of spinel pigment Co0.46Zn0.55(Ti0.064Cr0.91)2O4 |
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Authors: | Žaneta Mesíková Petra Šulcová M Trojan |
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Institution: | (1) Department of Inorganic Technology, Faculty of Chemical Technology, The University of Pardubice, Pardubice, Czech Republic, 532 10, nám. Čs. legií 565 |
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Abstract: | Synthesis of the green
spinel pigment Co0.46Zn0.55(Ti0.064Cr0.91)2O4 by a novel two-step method of preparation have
been investigated. Inorganic pigments are almost always prepared by a solid
state reaction. It is classical ceramic method which used oxides, hydroxides
or carbonates as precursors. The reaction is performed at temperature higher
than 1300°C and an agent of mineralization is usually present. The presented
novel method of preparation decreases the calcining temperature necessary
for reaching of bright and clear hue of the pigments prepared. Main attention
was focused on the influence of two types of titanium raw materials on the
temperature region of the spinel structure formation and on the colour properties
of the pigments. The mixture of precursors with TiO2
gives a one-phase system when calcining at 1100°C but the colour properties
are more interesting at 1150°C. Thermal stability of this pigment is limited
by temperature 1300°C. This temperature is connected with partial oxidation
of Cr(III) to Cr(VI). Thermal analysis provided the first information about
the temperature region of the pigment formation and determined the thermal
stability of pigment. |
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Keywords: | ceramic pigments optical properties spinel pigments thermal analysis |
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