Application of TDPAC to Metallofullerene Studies. (III).
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Accession number;01A0231207
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| Title;Application of TDPAC to Metallofullerene Studies. (III). |
| Author;
SATO WATARU
(Riken Oyogenshikakubutsurikenkyushitsu)
SUEKI KEISUKE
(Tokyotodai Daigakuinrigakukenkyuka)
ACHIBA YOJI
(Tokyotodai Daigakuinrigakukenkyuka)
NAKAHARA HIROMICHI
(Tokyotodai Daigakuinrigakukenkyuka)
OKUBO YOSHITAKA
(Kyoto Univ., Res. Reactor Inst.)
ASAI KICHIZO
(Univ. of Electro-Communications)
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Journal Title;Abstracts of Papers. Symposium on Radiochemistry
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Journal Code:F0139B
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ISSN:1345-2762
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VOL.44th;NO.;PAGE.50(2000)
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| Figure&Table&Reference; |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;The time-differential perturbed angular correlation (TDPAC)method has been applied to the study of the electronic state of endohedral Ce fullerenes: Ce@C82, Ce@C80, and CeLa@C80. For evaluating the oxidation state of the probe 140Ce, comparative studies have been performed with the same probe sincorporated in other substances such as graphite, diamonds, and some inorganic compounds (LaF3, La2(C2O4)3, PbTiO3,La2O3). It has been found that the estimated values for the electric field gradients (EFG) at the site of the probe nuclei accommodated inside the carbon cages and between the graphite layers are by far greater than those observed for 140Ce in the diamonds and inorganic compounds. Because there is little contribution of the asymmetric charge distribution in the lattice to the magnitude of the EFGs, we have inferred that the large magnitude of the EFGs for the Ce fullerenes and graphite can be attributed to a 4f electron; i.e. the Ce atoms encaged in fullerene cages are in the state of Ce3+. (author abst.) |
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