Abstract
A characterization study of chromium doped sol–gel mullites (with Cr2O3 contents varying between 1 and 9 wt.%) by means of electron beam techniques is presented. Scanning and transmission electron microscopy studies gave information about general microstructural features, like grain size and shape, presence of glassy phase in triple grain junctions and segregation of secondary crystalline phases. EDX-TEM measurements reveal an upper solubility of chromium in the mullite lattice of approx. 8 wt.% Cr2O3. The effect of Cr doping in the microstructural development of these mullites is discussed.
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