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The valence of cerium under high pressure |
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| Authors: | J Röhler D Wohlleben JP Kappler G Krill |
| Institution: | 1. II. Physikalisches Institut, Universität zu Köln, 5000 Cologne 41, West Germany;2. LURE (LP, CNRS) Université Paris Sud, 91405 Orsay, France;3. LMSES (LA CNRS 306), Université Louis Pasteur, 4 rue B. Pascal, 67070 Strasbourg, France;4. LURE (LP, CNRS) Université Paris Sud, 91405 Orsay, France |
| Abstract: | The valence of Ce metal shifts from 3.03 to only 3.32 (±0.02) between 0 and 120 kbar at 300 K. It is trapped by a deep minimum of the free energy which lies near valence 3.25 and is caused by strong interconfigurational mixing. In the á phase the valence is independent of pressure because of the coexistence of two crystallographic phases. The energy of promotion from Ce3+ to Ce4+ is found to be 1.9 eV. |
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