Paramagnetic resonance of Gd3+ in CeO2 single crystals

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Abstract

Gd3+ has been incorporated into single crystals of CeO2 (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 Gd3+ : ThO2. Forbidden transitions with ¦ ΔM5¦ #62; 1 were observed, as well as axial spectra in heavily doped crystals. Lines due to transitions with ΔM5 = ± 4 were identified in both ThO2 and CeO2.

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    Research sponsored by the U.S. Atomic Energy Commission under contract with the Union Carbide Corporation.

    Vanderbilt University; part of this work was submitted in partial fulfillment for the requirements of the Ph.D. degree at Vanderbilt University. Current address: Ling-Temco Vought Research Center, Dallas, Texas.

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