Abstract
The small splitting of the4A2 ground state of Cr3+ centers in Al2O3 has been measured with an EPR spectrometer in the temperature range from 88 K to 575 K. It is shown that the temperature dependence of this zero-magnetic-field splitting of about 2D=0.38 cm−1 is due to the thermal expansion of the lattice. It is found that\(\frac{{\partial \ln D}}{{\partial \ln R}} = 6.18\) whereR is the interparticle distance.
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