Nanocrystalline mullite with grain sizes in the range of 13–30 nm has been prepared by the sol–gel route at a temperature as low as 600°C with the incorporation of copper ions as copper sulfate. Characterization of the copper‐doped mullite was performed by DTA–TG, X‐ray diffraction (XRD), FESEM, and FTIR spectroscopy.
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