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    STUDIA CHEMIA - Issue no. 3, Tom I / 2016  
         
  Article:   INFLUENCE OF THE THERMAL TREATMENT ON THE COLOUR OF RO٠AL2O3 (R=CO, NI) TYPE SPINEL PIGMENTS PREPARED BY A MODIFIED SOL – GEL METHOD.

Authors:  FIRUTA GOGA, ROXANA DUDRIC, LILIANA BIZO, ALEXANDRA AVRAM, THOMAS DIPPONG, GABRIEL KATONA, GHEORGHE BORODI, ANDREEA ANTON. 		 
       
         
  Abstract:   This paper presents the results obtained through the synthesis of spinel - structured, ceramic pigment nanopowders (CoAl2O4 si NiAl2O4), using a modified sol – gel method. This study focuses on the influence of the thermal treatment, applied during gel calcination, on the properties of the obtained powders. The behavior of the dried gels during calcination was studied by differential thermal analysis. The formation of the spinel structure after the thermal treatment, was analyzed using X-ray diffraction. The colour of the powders was characterized by UV–VIS spectroscopy, determining the absorption spectra. Additionally, the trichromatic coordinates were determined, and the corresponding pigment positions were fixed on the chromaticity diagram.

Keywords: ceramic pigment nanopowders, cobalt spinels, nickel spinels, sol–gel method, sucrose, pectin.
 
         
     
         
         
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