Non-ionic contributions to the electric-field gradient at 111Cd/181Ta impurities in bixbyites |
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Authors: | Rentería Mario Freitag Kristian Errico Leonardo A |
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Institution: | 1.Departamento de Física, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, C.C. 67, 1900, La Plata, Argentina ;2.Institut für Strahlen- und Kernphysik (ISKP), Universit?t Bonn, Nussallee 14–16, D-53115, Bonn, Germany ; |
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Abstract: | The electric-field-gradient (EFG) tensor at both cation sites of the bixbyite structure in 181Hf-implanted Lu- and Sm-sesquioxides was determined by the PAC technique. The cumulated EFG data at Ta-impurity sites in binary
oxides enable us to discuss the “universal” character of the empirical correlation between local and ionic contributions to
the EFG in these systems. An EFG factorization in terms of the electronic characteristics of the probe and the geometry of
the cation coordination is proposed, which explains the experimental EFG results at Ta/Cd impurity sites in bixbyites and
agrees with a simplified decomposition of the EFG valence contribution coming from ab-initio calculations.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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