Yariv, Amnon (1962) Paramagnetic Resonance and Charge Compensation of Tetravalent Uranium (U4+) in Calcium, Strontium, and Barium Fluorides. Physical Review, 128 (4). pp. 1588-1592. ISSN 0031-899X. http://resolver.caltech.edu/CaltechAUTHORS:YARpr62b
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A new electron spin paramagnetic resonance spectrum in CaF2 doped with uranium is attributed to U4+. The spectrum possesses axial symmetry about the 〈111〉 directions and is describable by a spin Hamiltonian with g⊥=0±0.15 and gII=3.238±0.005 at 4.2°K. The trigonal symmetry is due to the presence of charge compensating O2- ions along the 〈111〉 directions. The spectrum is absent in crystals grown under reducing conditions. Similar results were also observed in SrF2 and BaF2.
|Additional Information:||© 1962 The American Physical Society. Received 12 June 1962. A brief account of this work was given by the author at the First International Conference on Paramagnetic Resonance, Jerusalem, Israel, July, 1962. It is a pleasure to acknowledge the extremely helpful communication with Professor B. Bleaney who first suggested the possibility of the U4+ spectrum. W.A. Hargreaves of Optovac, Inc., provided the many crystals investigated and was instrumental in establishing the correlation between the growing conditions and the U4+ concentration. We have also benefited from many discussions with Dr. J.P. Gordon and from the able experimental assistance of J.M. Dziedzic.|
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