Discoloration of fired kaolinitic clays (study of Fe(3+) coordination by Mossbauer and UV-ViS-NIR spectroscopy)

Abstract

The final color of a ceramic body is also determined by the contents of Fe(3+) ions. Oxidizing firing of the samples fired at over 1180 C changes the color in cases where the initial Fe(3+) component is in the form of hydro ferric oxide

Keywords

• kaolin
• clay
• Mössbauer spectroscopy
• iron
• mullite
• refinement
• zeolites
• charge