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Solid-State NMR Study on Actinide Dioxides

Published online by Cambridge University Press:  24 May 2012

Yo Tokunaga ,
Hironori Sakai ,
Shinsaku Kambe ,
Hiroyuki Chudo ,
Masahiko Osaka ,
Shuhei Miwa ,
Tsuyoshi Nishi ,
Masami Nakada ,
Akinori Itoh  and
Yoshiya Homma
Yo Tokunaga
Affiliation:
Advanced Science Research Center, Japan Atomic Energy Agency, 2-4 Shirakata-Shirane, Tokai, Naka, Ibaraki, 319-1195, Japan.
Hironori Sakai
Affiliation:
Advanced Science Research Center, Japan Atomic Energy Agency, 2-4 Shirakata-Shirane, Tokai, Naka, Ibaraki, 319-1195, Japan.
Shinsaku Kambe
Affiliation:
Advanced Science Research Center, Japan Atomic Energy Agency, 2-4 Shirakata-Shirane, Tokai, Naka, Ibaraki, 319-1195, Japan.
Hiroyuki Chudo
Affiliation:
Advanced Science Research Center, Japan Atomic Energy Agency, 2-4 Shirakata-Shirane, Tokai, Naka, Ibaraki, 319-1195, Japan.
Masahiko Osaka
Affiliation:
Oarai Research and Development Center, Japan Atomic Energy Agency, Oarai, Higashi-Ibaraki, Ibaraki 311-1393, Japan
Shuhei Miwa
Affiliation:
Oarai Research and Development Center, Japan Atomic Energy Agency, Oarai, Higashi-Ibaraki, Ibaraki 311-1393, Japan
Tsuyoshi Nishi
Affiliation:
Nuclear Science and Engineering Directorate, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan.
Masami Nakada
Affiliation:
Nuclear Science and Engineering Directorate, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan.
Akinori Itoh
Affiliation:
Nuclear Science and Engineering Directorate, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan.
Yoshiya Homma
Affiliation:
Institute for Materials Research, Tohoku University, Oarai, Higashi-Ibaraki, Ibaraki 311-1313, Japan.
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Abstract

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 Amcontaining 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 Peff=1.38 μB. The value suggests the 5f5 (Am4+) state of the Am ion in PuO2. For the x=1 (=AmO2) 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.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1444: Symposium S/Y – Actinides and Nuclear Energy Materials , 2012 , mrss12-1444-y05-08
Copyright
Copyright © Materials Research Society 2012

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