Change in magnetic properties induced by swift heavy ion irradiation in CeO2

Shimizu, Keita; Kosugi, S.; Tahara, Yoshiyuki; Yasunaga, Kōjirō; Kaneta, Yasunori; Ishikawa, N.; Hori, Fuminobu; Matsui, Toshiyuki; Iwase, A.

doi:10.1016/j.nimb.2012.01.008

Cited by 29 publications

(16 citation statements)

References 11 publications

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“…In order to investigate the trapping properties of gaseous fission products (FP) in CeO 2 , we determine their incorporation energies in charged defect sites. The incorporation energies are given using the following general expression: (11) where E tot (F P ,X) is the total energy of the supercell containing a fission product incorporated in the defect site X; E tot (X) is the total energy of the supercell containing the defect site X; and E tot (F P ) is the total energy of the isolated fission product. In order to consider the various charge states of the defect site in CeO 2 , the incorporation energy is expressed as a function of the formation energy of the defect site and the solution energy of the fission product in the defect site.…”

Section: B Incorporation Of Fission Products In Charged Defectsmentioning

confidence: 99%

“…x-ray absorption fine structure (EXAFS) measurements, and a new peak of normalized intensity in x-ray photoelectron spectroscopy (XPS) spectrum is observed and corresponds to the Ce 3+ state in the valence band. Moreover, a ferromagnetic behavior is determined as an intrinsic property of reduced ceria due to the magnetic moments induced by the localized 4f electrons of the Ce 3+ ions [11]. This ferromagnetic behavior opens the way to possible spintronics applications of CeO 2 .…”

Section: Introductionmentioning

confidence: 97%

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First-principles DFT+Uinvestigation of charged states of defects and fission gas atoms inCeO2

et al. 2016

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Cerium dioxide (CeO 2) is considered as a model material for the experimental study of radiation damage in the standard nuclear fuel uranium dioxide (UO 2). In this paper, we present a first-principles study in the framework of the DFT+U approach to investigate the charged point defects and the incorporation of the fission gases Xe and Kr in CeO 2 and compare it with published data in UO 2. All intrinsic charge states are considered for point defects in contrast to previous published studies. Our calculations prove that CeO 2 shows similar behavior to UO 2 in the formation of point defects with the same charge states under stoichiometric and nonstoichiometric conditions. The charge states of vacancies have an important effect on the incorporation of fission gas atoms in CeO 2. The bound Schottky defect with the two oxygen vacancies along the (100) direction is found to be energetically preferable to trap Xe and Kr atoms both in CeO 2 and UO 2. Xe and Kr atoms in the cation vacancy sites under nonformal charge states (different from 4−) in CeO 2 , unlike in UO 2 , lose electrons to their neighboring atoms, which is traced back to the absence of the +5 valence state for Ce in contrast to its existence for U.

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Section: B Incorporation Of Fission Products In Charged Defectsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

First-principles DFT+Uinvestigation of charged states of defects and fission gas atoms inCeO2

et al. 2016

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“…The BaFe 12 O 19 unit cell contains 38O 2− , 2Ba 2+ and 24Fe 3+ ions [23]. Swift ion irradiation produces more oxygen vacancies through the high density electronic excitation process, and the corresponding density efficiency of Fe 3+ ions depends on the electronic excitation process [28,29]. The uniaxial magnetic anisotropy existed in BaFe 12 O 19 hexaferrite was decreased by the oxygen vacancies created by swift ion radiation and hence, the magnetic saturation value was decreased.…”

Section: Resultsmentioning

confidence: 99%

Effect of 200 MeV Ag¹⁶⁺ swift heavy ion irradiation on structural and magnetic properties of M-type barium hexaferrite

Packiaraj

Sakthipandi²,

Hossain

2019

Mater. Res. Express

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M-type barium hexagonal ferrite (BaFe 12 O 19 ) has been synthesized by sol-gel auto combustion method. The synthesized material was irradiated with 200 MeV Ag 16+ ions using the 15UD Pelletron tandem accelerator and the changes in structural and surface morphology of material were investigated. The pristine (as-synthesised) and irradiated samples were characterized using different experimental techniques like x-ray diffraction (XRD), Fourier-transform infrared spectroscopy, transmission electron microscope (TEM) and vibrating sample magnetometer (VSM). The strong absorption peak between 580 and 440 cm −1 in the infrared spectrum and XRD confirmed the formation of ferrite structure for both irradiated and pristine samples. XRD peaks for the irradiated barium hexagonal ferrite were slightly broadened when compared pristine ferrite samples. The crystallite size of the irradiated barium hexagonal ferrite was higher than that of pristine barium hexagonal ferrite and is consistent with TEM images. Both saturation magnetization and coercivity were decreased with irradiation.

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“…4,5) Recently, we examined the effect of 200 MeV Xe ion irradiation on magnetic property and lattice structure of CeO 2 pellets. 6) After the irradiation, we observed that the ferromagnetic state appeared and the lattice parameter increased. The ferromagnetic state systematically increased with increasing the ion fluence, and the value of saturation magnetization, M S , reached the maximum value at the fluence of 2.0 © 10 13 /cm 2 , and then decreased for higher fluences.…”

Section: Introductionmentioning

confidence: 91%

Effect of 10 MeV iodine ion irradiation on the magnetic properties and lattice structure of CeO₂

Kishino

Shinoda

Shimizu

et al. 2014

Jpn. J. Appl. Phys.

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We have studied the magnetic properties and the lattice structure of pure CeO 2 irradiated with swift heavy ions. Experimental results showed that the ferromagnetism was induced at room temperature by 10 MeV I ion irradiation. The value of saturation magnetization increases with increasing the ion fluence and reaches a maximum value at about the fluence of 1.2 ' 10 13 /cm 2 , and then decreases. The X-ray diffraction (XRD) spectra showed that the lattice parameter of CeO 2 increases with increasing ion fluence. To examine the origin of the ferromagnetic state in CeO 2 , we compared the result for 10 MeV I ion irradiation with that for 200 MeV Xe ion irradiation. We also estimated the magnetic properties for CeO 2 pellets annealed at 1273 K in a vacuum. From the experimental results, we concluded that oxygen vacancies, which are produced by electronic excitation process due to high energy ion beam, play an important role in the appearance of the ferromagnetic state in CeO 2 .

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Change in magnetic properties induced by swift heavy ion irradiation in CeO2

Cited by 29 publications

References 11 publications

First-principles DFT+Uinvestigation of charged states of defects and fission gas atoms inCeO2

First-principles DFT+Uinvestigation of charged states of defects and fission gas atoms inCeO2

Effect of 200 MeV Ag¹⁶⁺ swift heavy ion irradiation on structural and magnetic properties of M-type barium hexaferrite

Effect of 10 MeV iodine ion irradiation on the magnetic properties and lattice structure of CeO₂

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Change in magnetic properties induced by swift heavy ion irradiation in CeO2

Cited by 29 publications

References 11 publications

First-principles DFT+Uinvestigation of charged states of defects and fission gas atoms inCeO2

First-principles DFT+Uinvestigation of charged states of defects and fission gas atoms inCeO2

Effect of 200 MeV Ag16+ swift heavy ion irradiation on structural and magnetic properties of M-type barium hexaferrite

Effect of 10 MeV iodine ion irradiation on the magnetic properties and lattice structure of CeO2

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Effect of 200 MeV Ag¹⁶⁺ swift heavy ion irradiation on structural and magnetic properties of M-type barium hexaferrite

Effect of 10 MeV iodine ion irradiation on the magnetic properties and lattice structure of CeO₂