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Journal Articles

Change in magnetic properties induced by swift heavy ion irradiation in CeO$$_{2}$$

Shimizu, Hirotaka*; Kosugi, Shinya*; Tahara, Yuki*; Yasunaga, Kazufumi*; Kaneta, Yasunori*; Ishikawa, Norito; Hori, Fuminobu*; Matsui, Toshiyuki*; Iwase, Akihiro*

Nuclear Instruments and Methods in Physics Research B, 286, p.291 - 294, 2012/09

https://doi.org/10.1016/j.nimb.2012.01.008
 Times Cited Count：27 Percentile：87.4(Instruments & Instrumentation)

We have studied the magnetic properties of pure CeO$$_{2}$$ irradiated with swift heavy ions. Experiment a results showed that the ferromagnetism was induced even at room temperature by 200 MeV Xe ion irradiation. The value of saturation magnetization, Ms, systematically changes as a function of ion-fluence. The X-ray diffraction (XRD) spectra show that the lattice constant of CeO$$_{2}$$ increases with increasing ion-fluence. This result and our previous XPS result show that the ion-irradiation produced oxygen vacancies. The present study implies that the ferromagnetic behavior of the ion-irradiated CeO$$_{2}$$ is attributed to the magnetic moments of localized 4f electrons on Ce$$^{3+}$$ atoms, which are related to oxygen vacancies.

Journal Articles

Study on effects of energetic ion irradiation in Gd$$_{2}$$O$$_{3}$$-doped CeO$$_{2}$$ by means of synchrotron radiation X-ray spectroscopy

Tahara, Yuki*; Shimizu, Hirotaka*; Ishikawa, Norito; Okamoto, Yoshihiro; Hori, Fuminobu*; Matsui, Toshiyuki*; Iwase, Akihiro*

Nuclear Instruments and Methods in Physics Research B, 277, p.53 - 57, 2012/04

https://doi.org/10.1016/j.nimb.2011.12.048

In this study, to simulate such an environment, Gd$$_{2}$$O$$_{3}$$-doped CeO$$_{2}$$ samples were irradiated with 200 MeV Xe$$^{14+}$$ ions at room temperature using an ion beam accelerator at JAEA-Tokai. As CeO$$_{2}$$ has the same fluorite structure as that of UO$$_{2}$$ and several properties of CeO$$_{2}$$ are similar to UO$$_{2}$$, in this study CeO$$_{2}$$ was used as a simulation material of UO$$_{2}$$. To study the effects of the ion irradiation on Gd$$_{2}$$O$$_{3}$$-doped CeO$$_{2}$$, extended X-ray absorption fine structure (EXAFS) and X-ray photoelectron spectroscopy (XPS) were used at the Photon Factory of High Energy Accelerator Research Organization (KEK) as well as conventional X-ray diffraction (XRD) measurement. The EXAFS and XRD spectra show that the effects of the ion irradiation are more pronounced for higher amount of Gd$$_{2}$$O$$_{3}$$ dopant.

Journal Articles

Study on effects of energetic ion irradiation in Gd$$_2$$O$$_3$$-doped CeO$$_2$$ by means of synchrotron radiation X-ray spectroscopy

Tahara, Yuki*; Shimizu, Hirotaka*; Ishikawa, Norito; Okamoto, Yoshihiro; Hori, Fuminobu*; Matsui, Toshiyuki*; Iwase, Akihiro*

Nuclear Instruments and Methods in Physics Research B, 277, p.53 - 57, 2012/04

https://doi.org/10.1016/j.nimb.2011.12.048
 Times Cited Count：11 Percentile：63.23(Instruments & Instrumentation)

To study the effects of Gd$$_2$$O$$_3$$-doping and the irradiation with high energy fission products in the nuclear fuels (UO$$_2$$), Gd$$_2$$O$$_3$$-doped CeO$$_2$$ pellets were irradiated with 200 MeV Xe$$^{14+}$$ ions. Effects of Gd$$_2$$O$$_3$$-doping and the ion irradiation were estimated by using Extended X-ray Absorption Fine Structure (EXAFS) measurement. The interatomic distances between each Ce and the first nearest O atoms, and Ce and the second nearest Ce atoms increase by the irradiation and the effect of the ion irradiation on the atomic distances is more pronounced for higher amounts of dopant. The Debye-Waller factors for Ce-O and Ce-Ce pairs increase with increasing the amount of Gd$$_2$$O$$_3$$ dopant. These results suggest that the lattice binding energy is weakened by Gd$$_2$$O$$_3$$-doping. The Debye-Waller factors increase also by the irradiation. The effect of ion irradiation on the Debye-Waller factors, however, becomes smaller for higher amounts of dopant.

Journal Articles

Study on ion-irradiation-induced ferromagnetism in FeRh intermetallic compound by means of magnetic Compton scattering

Kosugi, Shinya*; Matsui, Toshiyuki*; Ishikawa, Norito; Ito, Masayoshi*; Sakurai, Yoshiharu*; Aiko, Kazuma*; Shimizu, Hirotaka*; Tahara, Yuki*; Hori, Fuminobu*; Iwase, Akihiro*

Journal of Applied Physics, 109(7), p.07B737_1 - 07B737_3, 2011/04

https://doi.org/10.1063/1.3559469
 Times Cited Count：7 Percentile：31.11(Physics, Applied)

The magnetic Compton profiles of FeRh intermetallic compound were measured to study the ferromagnetism induced by 200 MeV Xe ion irradiation. The magnetic effect at 50 K increases with increasing the ion-fluence. The analysis of the experimental result revealed that the values of spin moment induced by the irradiation were close to the values of magnetization obtained by a superconducting quantum interference device magnetometer, suggesting that the ion irradiation mainly induces the spin magnetic moment.

Oral presentation

Modification of magnetic properties of CeO$$_{2}$$ by using swift ion beam

Iwase, Akihiro*; Shimizu, Hirotaka*; Hori, Fuminobu*; Matsui, Toshiyuki*; Ishikawa, Norito; Kaneta, Yasunori*

no journal, , 

CeO$$_{2}$$ is irradiated with 200 MeV Xe, and we found that it becomes ferromagnetic after the irradiation. This may be due to 4f electrons lacalized in Ce$$^{3+}$$ atoms created by the irradiation.

Oral presentation

Change in various properties induced by swift heavy ion irradiation in CeO$$_{2}$$

Kishino, Takanori*; Shimizu, Hirotaka*; Hori, Fuminobu*; Iwase, Akihiro*; Ishikawa, Norito; Okamoto, Yoshihiro; Saito, Yuichi

no journal, , 

In the present experiment, to obtain the fundamental knowledge of radiation effects on CeO$$_{2}$$, CeO$$_{2}$$ pellets and films were irradiated with various energetic ions. To evaluate the effect of high energy ion irradiation on CeO$$_{2}$$, we have used a con-ventional X-ray diffraction (XRD), Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy, X-ray Photoelectron Spectroscopy (XPS), and SQUID magne-tometer. In this symposium, we discuss the effects of ion irradiation on CeO$$_{2}$$.

6 (Records 1-6 displayed on this page)
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