17O NMR study in (Pu0.91Am0.09)O2

被引：3

作者：

Tokunaga, Yo ^{[1
]}

Osaka, Masahiko ^{[2
]}

Kambe, Shinsaku ^{[1
]}

Miwa, Shuhei ^{[2
]}

Sakai, Hironori ^{[1
]}

Chudo, Hiroyuki ^{[1
]}

Homma, Yoshiya ^{[3
]}

Shiokawa, Yoshinobu ^{[3
]}

机构：

[1] Japan Atom Energy Agcy, Adv Sci Res Ctr, Naka Ku, Ibaraki 3191195, Japan

[2] Japan Atom Energy Agcy, Oarai Res & Dev Ctr, Ibaraki 3111393, Japan

[3] Tohoku Univ, Inst Mat Res, Higashi Ibaraki, Ibaraki 3111313, Japan

来源：

JOURNAL OF NUCLEAR MATERIALS | 2010年 / 396卷 / 01期

关键词：

Plutonium dioxide; Americium dioxide; O-17; NMR; Magnetic moment; SPIN-LATTICE RELAXATION; MAGNETIC-SUSCEPTIBILITY; ACTINIDE DIOXIDES; PUO2; NPO2; FUEL;

D O I：

10.1016/j.jnucmat.2009.10.062

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

in order to investigate the magnetic properties of Am4+ ions in the cubic fluorite structure, we have performed O-17 NMR measurements on (Pu0.91Am0.09)O-2. We have observed a temperature-dependent O-17 NMR line broadening induced by classical dipolar hyperfine fields from the Am 5f moments. From NMR line simulations, the effective moment of the Am moments has been estimated to be mu(eff) = 1.38 mu(B)/Am. This value is comparable with mu(eff) = 1.32 or 1.53 mu(B)/Am reported for AmO2. We have also carried out nuclear relaxation measurements for 170 nuclei. The magnetization recovery has been found to exhibit a nonexponential time dependence with an exponent beta similar to 0.5. This result is well understood in terms of the nuclear relaxation mechanism induced by the Am 5f moment fluctuations via dipolar hyperfine fields. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：107 / 111

页数：5

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