TY - GEN
T1 - Solid-state NMR study on actinide dioxides
AU - Tokunaga, Yo
AU - Sakai, Hironori
AU - Kambe, Shinsaku
AU - Chudo, Hiroyuki
AU - Osaka, Masahiko
AU - Miwa, Shuhei
AU - Nishi, Tsuyoshi
AU - Nakada, Masami
AU - Itoh, Akinori
AU - Homma, Yoshiya
N1 - Funding Information:
We would like to thank T. Hotta, M. Kato, R. E. Walstedt, H. Yasuoka for valuable discussions and comments. A part of this work was supported by a Grant-in-Aid for Young Scientists (A) (No. 23686137) by Japan Society for the Promotion of Science (JSPS), “Basic actinide chemistry and physics research in close cooperation with hot laboratories” carried out under the Strategic Promotion Program for Basic Nuclear Research, and a Grant-in-Aid for Scientific Research on Innovative Areas “Heavy Electrons” (Nos. 20102006, 20102007) by the Ministry of Education, Culture, Sports, Science and Technology of Japan.
PY - 2012
Y1 - 2012
N2 - Besides the importance of the actinide dioxide series as a nuclear fuel, the magnetic properties of these compounds at low temperatures are particularly interesting. Their surprisingly varied physical properties at low temperatures stimulate continuing interest for both theory and experiment. Recently, we have performed 17O-NMR studies for the first time on Pu and Am-containing dioxide systems, (Pu1-xAmx)O2. For the x=0.09 sample, a temperature-dependent NMR line broadening has been observed at low temperatures. By comparing the experimental data with the results of NMR line simulations, we have estimated the effective moment of Am ions to be P eff=1.38 μB. The value suggests the 5f5 (Am4+) state of the Am ion in PuO2. For the x=1 (=AmO 2) sample, on the other hand, our 17O-NMR data provide the first microscopic evidence for a phase transition at 8.5 K as a bulk property in this system. A spectrum with a triangular line shape indicates that the internal field is distributed very nearly randomly in the ordered state.
AB - Besides the importance of the actinide dioxide series as a nuclear fuel, the magnetic properties of these compounds at low temperatures are particularly interesting. Their surprisingly varied physical properties at low temperatures stimulate continuing interest for both theory and experiment. Recently, we have performed 17O-NMR studies for the first time on Pu and Am-containing dioxide systems, (Pu1-xAmx)O2. For the x=0.09 sample, a temperature-dependent NMR line broadening has been observed at low temperatures. By comparing the experimental data with the results of NMR line simulations, we have estimated the effective moment of Am ions to be P eff=1.38 μB. The value suggests the 5f5 (Am4+) state of the Am ion in PuO2. For the x=1 (=AmO 2) sample, on the other hand, our 17O-NMR data provide the first microscopic evidence for a phase transition at 8.5 K as a bulk property in this system. A spectrum with a triangular line shape indicates that the internal field is distributed very nearly randomly in the ordered state.
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U2 - 10.1557/opl.2012.1001
DO - 10.1557/opl.2012.1001
M3 - Conference contribution
AN - SCOPUS:84875488952
SN - 9781605114217
T3 - Materials Research Society Symposium Proceedings
SP - 149
EP - 158
BT - Actinides and Nuclear Energy Materials
T2 - 2012 MRS Spring Meeting
Y2 - 9 April 2012 through 13 April 2012
ER -