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    STUDIA PHYSICA - Issue no. 2 / 2011  
         
  Article:   EFFECT OF THE TEMPERATURE AND THE HEATING TIME ON THE COMPOSITION OF AN ILLITE-RICH CLAY: AN XRPD STUDY.

Authors:  C. IONESCU.
 
       
         
  Abstract:  The study focuses on the effect of heating on the composition of an illite-rich clay used to produce black ceramic, by applying several distinct time intervals and temperature ranges. Density measurements and X-ray powder diffraction (XRPD) analysis were carried out on raw and thermally-treated clay samples. The density of the fired samples shows a decrease for lower heating temperatures but increases significantly with heating time at 1100╬┐C. Changes of the intensity of the XRPD lines of illite muscovite, calcite, feldspar and chlorite occur at different temperatures, depending of the length of the heating time. XRPD proves the presence of newly-formed feldspar, hematite, magnetite, possibly maghemite, as well as some amorphous/vitreous phases.

Key words: Clays; high temperature; density; XRPD 

 
         
     
         
         
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