ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 58, (2) 145 - 150 (201)

Sedghi Arman 1, Alimohammadi Marzieh 2, Zahed Monireh Chadorbaf 1
1 Materials engineering department, Imam Khomeini International University, Qazvin, Iran
2 Materials engineering department, Islamic Azad University, Saveh branch, Saveh, Iran

Keywords: Pigments, Spinel structure, Gel combustion, CIELAB colorimetric

Cobalt aluminate (CoAl2O4) is a double oxide with a normal spinel structure which has been widely used in ceramic industry, but because of cobalt cost and its environmental problems, many researches were conducted to reduce cobalt in this spinel. Using CoxZn1-xAl2O4 instead of CoAl2O4 reduce production costs minimize the environmental damages, but its optical and physical properties have been changed by reduction of Co content. In this research, CoxZn1-xAl2O4 (x = 0; 0.25; 0.5; 0.75 and 1) ceramic pigments were synthesized by gel combustion method via glycine as a fuel and their reaction parameters, phase Structure, morphology and color were studied by XRD, TG/DTA, FTIR, CIELAB Colorimetric and FESEM respectively. Thermal analysis results showed an exothermic peak with about 80 % weight loss which was related to spinel formation at about 200oC. XRD results revealed that structure of pigments were spinel and they have average crystallite size below 64 nanometer in (311), (220) and (440) directions. The colorimetric results showed that color of pigments were changed from dark blue to light blue and this behavior was related to the Co/Zn ratio also their lightness and chroma were increased by increasing calcination temperature.

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