Abstract
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%.
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