The properties of (3d)4ions in corundum. II. Effects of electric fields on the APR spectra and lineshape analysis

Abstract

For pt. I, see ibid., vol.5, 3397 (1972). The shape of APR lines from (3d)⁴ ions in Al₂O₃ has been investigated when the direction of the applied magnetic field and constant electric fields up to 70 kV cm^-1 are varied. It is found that the spectrum is much more sensitive to an electric field applied along the a axis than the same field along the b axis. A detailed semiquantitative discussion of the intensities of the edges and peaks in the spectrum is given. From the results, information is obtained on the E type components of the random internal strains and electric field distributions experienced by the Cr²⁺ and Mn³⁺ ion impurities in Al₂O₃.