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Journal Articles

Electronic structure of BaFeO$$_{3}$$ studied by X-ray spectroscopy

Mizumaki, Masaichiro*; Fujii, Hitoshi*; Yoshii, Kenji; Hayashi, Naoaki*; Saito, Takashi*; Shimakawa, Yuichi*; Uozumi, Takayuki*; Takano, Mikio*

Physica Status Solidi (C), 12(6), p.818 - 821, 2015/06

https://doi.org/10.1002/pssc.201400252
 Times Cited Count：10 Percentile：94.36(Physics, Condensed Matter)

We investigated the electronic structure of BaFeO$$_{3}$$ by using HAXPES and XAS measurements and first principle studies. The experimental and theoretical results indicated that BaFeO$$_{3}$$ is a negative charge transfer compound. We concluded that the on-site Coulomb energy and the strong hybridization between Fe-3d and O-2p orbitals play a very important role of emergence of negative charge transfer. And we found the new structure in the Fe-2p XPS spectrum and concluded this structure is originated from non-local screening.

Journal Articles

Magnetocaloric effect of field-induced ferromagnet BaFeO$$_{3}$$

Mizumaki, Masaichiro*; Yoshii, Kenji; Hayashi, Naoaki*; Saito, Takashi*; Shimakawa, Yuichi*; Takano, Mikio*

Journal of Applied Physics, 114(7), p.073901_1 - 073901_6, 2013/08

https://doi.org/10.1063/1.4818316
 Times Cited Count：19 Percentile：61.58(Physics, Applied)

We have investigated the magnetocaloric effect (MCE) of a perovskite oxide, BaFeO$$_{3}$$, that shows ferromagnetism by the aid of a small external field of about 0.3 T below the Curie temperature T$$_{C}$$ = 111 K. The magnetization is found to change almost reversibly in both field and temperature cycles. Hence, magnetic and thermal hysteretic losses are negligibly low during refrigeration, a property that is suitable for application. The reversible MCE is likely to arise from the absence of an orbital magnetic moment of Fe ions which are essentially in the Fe$$^{3+}$$L state (L: ligand hole). The magnetic entropy change and refrigerant capacity near the T$$_{C}$$ are about 5.8 J kg$$^{-1}$$ K$$^{-1}$$ and about 172 J kg$$^{-1}$$, respectively, both of which are comparable to those of ferromagnetic perovskite manganites. As BaFeO$$_{3}$$ contains no rare metals and is stable against corrosion, the material can be regarded as a candidate refrigerant material.

JAEA Reports

Investigation on cause of outage of Wide Range Monitor (WRM) in High Temperature engineering Test Reactor (HTTR); Transport operation toward investigation for cause of outage

Shinohara, Masanori; Sawahata, Hiroaki; Kawamoto, Taiki; Motegi, Toshihiro; Saito, Kenji; Takada, Shoji; Yoshida, Naoaki; Isozaki, Ryosuke; Katsuyama, Kozo

JAEA-Technology 2012-025, 31 Pages, 2012/08

JAEA-Technology-2012-025.pdf:4.69MB

An event, in which one of WRMs were disabled to detect the neutron flux in the reactor core, occurred during the period of reactor shut down of HTTR in March, 2010. The actual life time of WRM was unexpectedly shorter than the past developed life time. Investigation of the cause of the outage of WRM toward the recovery of the life time up to the developed life is one of the issues to develop the technology basis of High Temperature Gas cooled Reactor (HTGR). Then, a post irradiation examination was planned to specify the damaged part causing the event in the WRM was also planned. For the investigation, the X-ray computed tomography scanner in Fuels Monitoring Facility (FMF). This report describes the preliminary investigation on the cause of outage of the WRM. The results of study for transportation method of the irradiated WRM from HTTR to FMF is also reported with the record to complete the transport operation.

Journal Articles

Void formation and microstructural development in oxide dispersion strengthened ferritic steels during electron-irradiation

Saito, J.*; Suda, Takanori*; Yamashita, Shinichiro*; Onuki, Somei*; Takahashi, Heishichiro*; Akasaka, Naoaki; Nishida, M.; Ukai, Shigeharu

Journal of Nuclear Materials, 258-263(Part 2), p.1264 - 1268, 1998/10

https://doi.org/10.1016/S0022-3115(98)00140-8
 Times Cited Count：40 Percentile：92.81(Materials Science, Multidisciplinary)

None

Oral presentation

$$^{41}$$Ca analysis by a rotating electric field deflection mass spectrometer

Katayama, Atsushi; Kameo, Yutaka; Ishimori, Kenichiro; Omura, Hideki*; Saito, Naoaki*; Nakashima, Mikio

no journal, , 

no abstracts in English

Oral presentation

Magnetocaloric effect and electronic structure of ferromagnetic perovskite BaFeO$$_{3}$$

Mizumaki, Masaichiro*; Yoshii, Kenji; Hayashi, Naoaki*; Saito, Takashi*; Shimakawa, Yuichi*; Takeuchi, Yayoi*; Takano, Mikio*

no journal, , 

BaFeO$$_{3}$$ is known to contain the rare valence state of iron, 4+. Although this system has been reported to be an antiferromagnet prepared in the conventional high pressure and high temperature method, the samples synthesized under low temperature oxidization was found to be ferromagnetic. BaFeO$$_{3}$$ shows a Curie temperature of 100 K; however, more details of magnetic properties have not been reported. In this study we report the magnetocaloric effect and the electronic structure of BaFeO$$_{3}$$.

Oral presentation

Development of analytical method of resonance ionization mass spectrometry using a rotating electric field for long-lived nuclides; Measurement using laser ablation employed as atomization method

Kochiyama, Mami; Ishimori, Kenichiro; Toshimitsu, Masaaki; Katayama, Atsushi; Saito, Naoaki*; Omura, Hideki*; Takahashi, Kuniaki

no journal, , 

no abstracts in English

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