Abstract
Measurements have been made of the acoustic paramagnetic resonance spectra of both Cr2+ and Mn3+ in Al2O3 at frequencies between 8.4 and 9.5 GHz. Results have been obtained as the direction of the magnetic field H is verified in the ac plane, the bc plane and in a cone around the c axis. Two types of lines are in evidence: type 1 lines have an edge and type 2 lines a peak. The shapes are explained by assuming that random internal strains and electric fields of E type symmetry exist in the crystal. The variations of the positions of the peak or edge as H is varied are readily explained. This analysis shows that (3d)4 ions in Al2O3 are at a site which has predominantly trigonal symmetry and that the superimposed random tetragonal components are small.
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