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

Yo Tokunaga; Masahiko Osaka; Shinsaku Kambe; Shuhei Miwa; Hironori Sakai; Hiroyuki Chudo; Yoshiya Homma; Yoshinobu Shiokawa

doi:10.1016/j.jnucmat.2009.10.062

¹⁷O NMR study in (Pu_0.91Am_0.09)O₂

Yo Tokunaga, Masahiko Osaka, Shinsaku Kambe, Shuhei Miwa, Hironori Sakai, Hiroyuki Chudo, Yoshiya Homma, Yoshinobu Shiokawa

Materials Processing and Characterization Division

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

In order to investigate the magnetic properties of Am⁴⁺ ions in the cubic fluorite structure, we have performed ¹⁷O NMR measurements on (Pu_0.91Am_0.09)O₂. We have observed a temperature-dependent ¹⁷O 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 μ_eff = 1.38 μ_B / Am. This value is comparable with μ_eff = 1.32 or 1.53 μ_B / Am reported for AmO₂. We have also carried out nuclear relaxation measurements for ¹⁷O nuclei. The magnetization recovery has been found to exhibit a nonexponential time dependence with an exponent β ∼ 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.

Original language	English
Pages (from-to)	107-111
Number of pages	5
Journal	Journal of Nuclear Materials
Volume	396
Issue number	1
DOIs	https://doi.org/10.1016/j.jnucmat.2009.10.062
Publication status	Published - 2010 Jan 1

Keywords

Americium dioxide
Magnetic moment
O NMR
Plutonium dioxide

ASJC Scopus subject areas

Nuclear and High Energy Physics
Materials Science(all)
Nuclear Energy and Engineering

Access to Document

10.1016/j.jnucmat.2009.10.062

Cite this

@article{0776458c32cc4d2aba5a8bcfcd682caf,

title = "17O NMR study in (Pu0.91Am0.09)O2",

abstract = "In order to investigate the magnetic properties of Am4+ ions in the cubic fluorite structure, we have performed 17O NMR measurements on (Pu0.91Am0.09)O2. We have observed a temperature-dependent 17O 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 μeff = 1.38 μB / Am. This value is comparable with μeff = 1.32 or 1.53 μB / Am reported for AmO2. We have also carried out nuclear relaxation measurements for 17O nuclei. The magnetization recovery has been found to exhibit a nonexponential time dependence with an exponent β ∼ 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.",

keywords = "Americium dioxide, Magnetic moment, O NMR, Plutonium dioxide",

author = "Yo Tokunaga and Masahiko Osaka and Shinsaku Kambe and Shuhei Miwa and Hironori Sakai and Hiroyuki Chudo and Yoshiya Homma and Yoshinobu Shiokawa",

note = "Funding Information: We thank M. Akabori and M. Takano for useful advice with sample preparation. We also thank R.E. Walstedt for valuable comments and discussions. A part of this study is the result of Basic actinide chemistry and physics research in close cooperation with hot laboratories carried out under the Strategic Promotion Program for Basic Nuclear Research by the Ministry of Education, Culture, Sports, Science and Technology of Japan. ",

year = "2010",

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doi = "10.1016/j.jnucmat.2009.10.062",

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T1 - 17O NMR study in (Pu0.91Am0.09)O2

AU - Tokunaga, Yo

AU - Osaka, Masahiko

AU - Kambe, Shinsaku

AU - Miwa, Shuhei

AU - Sakai, Hironori

AU - Chudo, Hiroyuki

AU - Homma, Yoshiya

AU - Shiokawa, Yoshinobu

N1 - Funding Information: We thank M. Akabori and M. Takano for useful advice with sample preparation. We also thank R.E. Walstedt for valuable comments and discussions. A part of this study is the result of Basic actinide chemistry and physics research in close cooperation with hot laboratories carried out under the Strategic Promotion Program for Basic Nuclear Research by the Ministry of Education, Culture, Sports, Science and Technology of Japan.

PY - 2010/1/1

Y1 - 2010/1/1

N2 - In order to investigate the magnetic properties of Am4+ ions in the cubic fluorite structure, we have performed 17O NMR measurements on (Pu0.91Am0.09)O2. We have observed a temperature-dependent 17O 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 μeff = 1.38 μB / Am. This value is comparable with μeff = 1.32 or 1.53 μB / Am reported for AmO2. We have also carried out nuclear relaxation measurements for 17O nuclei. The magnetization recovery has been found to exhibit a nonexponential time dependence with an exponent β ∼ 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.

AB - In order to investigate the magnetic properties of Am4+ ions in the cubic fluorite structure, we have performed 17O NMR measurements on (Pu0.91Am0.09)O2. We have observed a temperature-dependent 17O 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 μeff = 1.38 μB / Am. This value is comparable with μeff = 1.32 or 1.53 μB / Am reported for AmO2. We have also carried out nuclear relaxation measurements for 17O nuclei. The magnetization recovery has been found to exhibit a nonexponential time dependence with an exponent β ∼ 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.

KW - Americium dioxide

KW - Magnetic moment

KW - O NMR

KW - Plutonium dioxide

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