Abstract
Abstract Mixed crystals of ammonium aluminium alum and thallium aluminium alum are grown with various concentrations of ammonium and thallium with chromium as dopant. The optical absorption spectra and EPR spectra are recorded and analysed. Variation of zero field splitting parameter (D) with concentration of thallium is studied in EPR spectra. The increase in the value of D with increasing concentration of thallium atoms is predicted to be due to the trigonal distortion caused by these atoms in the co-ordinating water octahedron. These results are also supported by the splitting of one of the bands in the optical absorption spectrum which is attributed to the trigonal distortion and increase in splitting with increase of thallium atom concentration.
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