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Inhomogeneous distribution of Cr impurities in α–Al2O3 during refractory aging

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Abstract

Aged alumina refractories have been investigated by EPR (Electron Paramagnetic Resonance) and EPMA (Electron Probe Micro-Analysis). EPMA shows that Cr is homogeneously distributed inside the corundum grains within spatial resolution (1 μm). Cr3+ concentration at the atomic scale is obtained by EPR by the magnitude of dipolar broadening due to Cr-Cr interactions. This local concentration appears to be systematically higher (up to a factor of 10) than the average chromium content of the corundum crystals determined by EPMA. Cr3+ ions may be preferentially concentrated at the vicinity of extended lattice defects which help in accommodating the lattice strain due to the size difference between Al3+ and Cr3+ cations. A random location of these defects explains the apparent homogeneous chromium distribution found by EPMA in these aged refractories.

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Authors and Affiliations

  1. Laboratoire de Minéralogie-Cristallographie, URA CNRS 09, Universités de Paris 6 et 7 et IPGP, 75252, Paris Cedex 05, France

    Laurence Galoisy & Georges Calas

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  1. Laurence Galoisy
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  2. Georges Calas
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Galoisy, L., Calas, G. Inhomogeneous distribution of Cr impurities in α–Al2O3 during refractory aging. Journal of Materials Research 8, 1153–1157 (1993). https://doi.org/10.1557/JMR.1993.1153

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  • DOI: https://doi.org/10.1557/JMR.1993.1153

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