Ce and Pr5d-energy levels in the (pseudo) perovskites KMgF3 and NaMgF3 |
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Authors: | NJM Le Masson AP Vink AJJ Bos JP Chaminade |
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Institution: | a Interfaculty Reactor Institute, Radiation Technology Group, Delft University of Technology, Mekelweg 15, 2629 JB Delft, The Netherlands b Institut de Chimie de la Matière Condensée de Bordeaux, CNRS, 87, Av. du Dr. Albert Schweitzer, 33608 Pessac Cedex, France |
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Abstract: | The location of the 5d-energy levels of Ce3+ and Pr3+ in the cubic perovskite KMgF3 and in the distorted perovskite NaMgF3 was determined from spectroscopic studies in the vacuum ultraviolet. It is established that Ce3+ and Pr3+ ions both occupy the same site in each host: K+ sites for KMgF3 and Na+ sites for NaMgF3. The small crystal field splitting and the small value of the centroid shift of the 4fn−15d-configuration yield a relatively high energy for the lowest 5d state of both Ce3+ and Pr3+. The lowest 5d state of Pr3+ in both hosts is found at energy higher than the 4f2 state, enabling the photon cascade emission to occur. |
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Keywords: | 78 55 Hx |
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