Abstract
Attempts were made to grow CeO2 and ThO2 single crystals doped with transition metal ions. Only Fe3+ and Mn2+ could be detected by the EPR technique. The EPR spectrum of Fe3+ in CeO2 exhibits the well-known fine structure in cubic fields. The parameters areg=2.0044(1) anda=15.6(1)·10−4 cm−1. The hyperfine constantA for57Fe in hexahedral coordination was found to be 8.9(1)·10−4 cm−1. The EPR spectrum of Mn2+ in CeO2 reveals two cubic Mn2+ centers. The parameters for center 1 areg=1.9999(1) andA=86.9(1)·10−4 cm−1 and for center 2g=1.9984(1) andA=87.0(1)·10−4 cm−1. Heating the Mn doped CeO2 samples in hydrogen, the Mn2+ centers transform from cubic into trigonal centers with approximate values ofg=1.9988(2),A=84.5(6)·10−4 cm−1 andD=203(1)·10−4 cm−1. The two observed Mn2+ centers in ThO2 exhibita priori axial symmetry with approximate values ofg=2.0006(2),A=88.9(4)·10−4 cm−1 andD=33(3)·10−4 cm−1.
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Prohaska, J., Trömel, M. & Rager, H. EPR study of Fe3+ and Mn2+ in CeO2 and ThO2 . Appl. Magn. Reson. 5, 387–398 (1993). https://doi.org/10.1007/BF03162535
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DOI: https://doi.org/10.1007/BF03162535