Luminescence of Trivalent Chromium Ions in Mullite During Firing of Kaolin

Аннотация

The luminescence spectra in samples of fired kaolin are investigated. It is shown that the obtained radiation corresponds to the luminescence of Cr³⁺ ions in mullite. The effect of the firing temperature and mass content of chromium oxide on the emission spectra is studied. The activation energy of mullite formation is determined from the experimental dependences to be E_a = 144 ± 6 kJ/mole and the maximum solubility of Cr₂O₃ in mullite equals 0.33%.