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EPR study of Ce ions in lutetium silicate scintillators Lu2Si2O7 and Lu2SiO5 |
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| Authors: | L. Pidol,O. Guillot-Noë l,B. Viana,D. Gourier |
| Affiliation: | a Laboratoire de Chimie Appliquée de l'Etat Solide, UMR-CNRS 7574, Ecole Nationale Superieure de Chimie de Paris, 11 rue Pierre et Marie Curie, 75231 Paris Cedex 05, France b Saint Gobain Cristaux, 104 route de Larchant, 77140 Saint Pierre les Nemours, France c LETI-CEA Grenoble, 17 rue des Martyrs, 38054 Grenoble cedex 09, France |
| Abstract: | Two Ce3+-doped scintillator crystals, LSO (Lu2SiO5:Ce) and LPS (Lu2Si2O7:Ce), are studied by EPR spectroscopy. The analysis indicates that Ce3+ substitutes for Lu3+ ion in a C2-symmetry site for LPS and in two C1-symmetry sites for LSO, with a preference for the largest one, with 6+1 oxygen neighbors. Angular dependence of the EPR spectrum shows that the electronic ground state of Ce3+ is different in these two matrices. It is mainly composed of |MJ|=5/2 state in LPS and |MJ|=3/2 state in LSO. The temperature dependence of the linewidth shows a noticeably long spin lattice relaxation time, especially in LPS, which is the result of a stronger crystal field in LPS than in LSO. |
| Keywords: | A. Inorganic compounds D. Electron paramagnetic resonance (EPR) D. Crystal structure |
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