Abstract
Gd 3+ has been incorporated into single crystals of CeO 2 (fluorite structure) in cubic sites and the ESR spectrum observed. The temperature dependence of the cubic crystal splitting has been measured from room temperature to ≈ 2°K and values of g, the fourth order parameter, c, and the sixth order parameter, d, in the spin Hamiltonian treatment for the crystal field potential have been obtained using a computer program. The parameters c and d were found to have the same sign and intensity observations of the temperature dependence of the resonance absorption lines showed that c was negative. The temperature dependence of the total splitting for H∥[100] was found to be similar to that observed in Gd 3+ : ThO 2. Forbidden transitions with ¦ Δ M 5 ¦ #62; 1 were observed, as well as axial spectra in heavily doped crystals. Lines due to transitions with Δ M 5 = ± 4 were identified in both ThO 2 and CeO 2.
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