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

Ceramics-Silikáty 56, (4) 301 - 305 (2012)


SYNTHESIS AND SPECTRA CHARACTERIZATION OF CoxZn1-xAl2O4 NANOSIZED PIGMENTS BY GEL COMBUSTION METHOD
 
Chadorbafzadeh M., Baghshahi S., Mohebi M. M.
 
Department of Materials Sci. and Eng., Faculty of Engineering, IKIU, Qazvin, Iran

Keywords: Pigment, Cobalt, Spinel, Gel Combustion
 

Nano sized pigments with the general formula CoxZn1-xAl2O4 (x = 0, 0.2, 0.4, 0.6, 0.8, 1) were synthesized using chlorides by gel combustion method at 700, 800, 900, 1000, 1100oC. DTA/TG, XRD, UV-Vis. and SEM were used to characterize the samples. The DTA results revealed that the formation of the spinel phase occurred at 600 to 670oC. XRD results showed that all the samples, except those treated at 1000 and 1100oC, were constituted of only one phase. The ones treated at 1000 and 1100oC showed extra peaks related to Al2O3. The cobalt containing samples showed a low reflection in the range of 540 to 630 nm, corresponding to the absorption of the colors yellow and orange. Therefore, the cobalt containing samples demonstrated diverse blue colors. The results also revealed that by increasing the cobalt content, the crystallite size decreased from 32 to 9 nm, while by the rise in heat treatment temperature it decreased from 17 to 26. The SEM micrographs revealed the formation of nanosized pigments, with some degree of agglomeration.


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