Abstract
Mullites doped with Cr 2O 3 concentrations ranging from 2 to 10 wt% were investigated by both timeresolved emission spectroscopy and site-selective excitation. The emission decays are non-exponential. They depend on Cr concentration and emission frequency and, hence, it is possible to distinguish different kinds of Cr 3+ sites: at least two different types of low field site, one type of high field site and one intermediate field site. The emission decay time for Cr 3+ in intermediate field sites was found to be the longest. In Cr 2O 3-poor mullites Cr 3+ occurs dominantly at high field sites, i.e. at structural M(1) positions replacing Al 3+, whereas in Cr 2O 3-rich mullites the majority of Cr 3+ is incorporated in interstitial sites.
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