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    STUDIA CHEMIA - Issue no. 1 / 2009  
         
  Article:   SYNTHESIS AND CHARACTERIZATION OF SOME THERMORESISTANT PIGMENTS BASED ON THE AL3+→ CR3+ SUBSTITUTION.

Authors:  SILVANA IANOŞEV, RADU LAZĂU, MARIANA SUBA, CORNELIA PĂCURARIU, IOAN LAZĂU.
 
       
         
  Abstract:   The paper presents the obtained results in the synthesis of some thermoresistant pink pigments with different structures, such as: corundum (Al2-xCrxO3), spinel (ZnAl2-xCrxO4, MgAl2-xCrxO4) and perovskite (LaAl1-xCrxO3). An unconventional synthesis method has been used in order to increase the substitution of Al3+ with Cr3+ . The method used is based on the thermal decomposition of organic complex combinations containing as ligand the glyoxylate dianion, (C2H2O42-). The evolution of the crystalline phases with temperature has been investigated by XRD. The colorimetric characterization of the obtained pigments has been studied by diffuse reflectance spectrophotometry.

Keywords: thermoresistant pink pigments, chromophore chromium (Cr3+ , Cr4+ ), mineralizers.
 
         
     
         
         
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