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Search Results: Records 1-20 displayed on this page of 28

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Journal Articles

Synthesis of carbon nanowalls using plasma-irradiated solid carbon and absorption of Cs in water

Fukada, Yukimasa; Aoyagi, Yumito*; Yokoyama, Misaki*; Horibe, Yoichi*; Kano, Jun*; Kaneda, Miyu*; Fujii, Tatsuo*; Yoshigoe, Akitaka; Kobata, Masaaki; Fukuda, Tatsuo; et al.

Journal of Electronic Materials, 54, p.686 - 692, 2025/01

https://doi.org/10.1007/s11664-024-11586-9
 Times Cited Count：0 Percentile：0.00(Engineering, Electrical & Electronic)

no abstracts in English

Journal Articles

Towards innovation to transform radioactive waste into resources; A Way of converting heat and radiation into electricity

Ieda, Junichi; Fukada, Yukimasa; Fukuda, Tatsuo

Nihon Genshiryoku Gakkai-Shi ATOMO$$Sigma$$, 66(10), p.521 - 524, 2024/10

https://doi.org/10.3327/jaesjb.66.10_521

no abstracts in English

Journal Articles

Valence control of charge and orbital frustrated system YbFe$$_{2}$$O$$_{4}$$ with electrochemical Li$$^{+}$$ intercalation

Murase, Satoshi*; Yoshikawa, Yumi*; Fujiwara, Kosuke*; Fukada, Yukimasa*; Teranishi, Takashi*; Kano, Jun*; Fujii, Tatsuo*; Inada, Yasuhiro*; Katayama, Misaki*; Yoshii, Kenji; et al.

Journal of Physics and Chemistry of Solids, 162, p.110468_1 - 110468_6, 2022/03

https://doi.org/10.1016/j.jpcs.2021.110468
 Times Cited Count：0 Percentile：0.00(Chemistry, Multidisciplinary)

We report a trial of the valence control for mixed valence iron triangular oxide YbFe$$_{2}$$O$$_{4}$$ in order to develop an effective technique to control the frustration of charges in strongly correlated electron systems. The electro-chemical doping of Li$$^{+}$$ into YbFe$$_{2}$$O$$_{4}$$ was examined on the cell type sample similar to the Li-ion secondary battery cell. Systematic change of the lattice constant, Fe-Fe and Fe-Yb distance were observed with Li doping. Maximum value of the doping was over 300 mAh/g. An EXAFS experiment indicated that Li positioned between Yb octahedron layer (U-layer) and Fe-bipyramidal layer (W-layer). However, detailed change of iron valence state of YbFe$$_{2}$$O$$_{4}$$ was not clearly observed because of the superimpose of the signal from iron metal nano particles in XANES observation. The results indicate that the electrochemical method might be one of the potential technique to control the frustration of charges in YbFe$$_{2}$$O$$_{4}$$.

Journal Articles

Analysis of glass behavior of Lu$$_{2}$$Fe$$_{3}$$O$$_{7}$$ with distributed equivalent circuit model

Fukada, Yukimasa*; Fukuyama, Ryota*; Fujiwara, Kosuke*; Yoshii, Kenji; Shigematsu, Kei*; Azuma, Masaki*; Ikeda, Naoshi*

Journal of the Physical Society of Japan, 90(2), p.024710_1 - 024710_6, 2021/02

https://doi.org/10.7566/JPSJ.90.024710
 Times Cited Count：2 Percentile：21.70(Physics, Multidisciplinary)

We report an analysis of the dielectric glasslike state of the spin- and charge-ordered system Lu$$_{2}$$Fe$$_{3}$$O$$_{7}$$, which has structural and physical properties analogous to those of the electronic ferroelectrics ${it R}$Fe$$_{2}$$O$$_{4}$$ (${it R}$: rare earth). Aging and memory effects of resistivity were found in the electric impedance response. We performed a numerical analysis with equivalent electric circuits that have a logarithmic Gaussian distribution of resistance and capacitance. The distribution parameters well explained the glassy nature of the electric and dielectric properties between 100 and 200 K and the distribution variations of charge- and magnetic-ordered domains underlying the glass nature.

Journal Articles

Observation of momentum-resolved charge fluctuations proximate to the charge-order phase using resonant inelastic X-ray scattering

Yoshida, Masahiro*; Ishii, Kenji; Naka, Makoto*; Ishihara, Sumio*; Jarrige, I.*; Ikeuchi, Kazuhiko*; Murakami, Yoichi*; Kudo, Kazutaka*; Koike, Yoji*; Nagata, Tomoko*; et al.

Scientific Reports (Internet), 6, p.23611_1 - 23611_8, 2016/03

https://doi.org/10.1038/srep23611
 Times Cited Count：1 Percentile：10.54(Multidisciplinary Sciences)

Journal Articles

Magnetoelectric effect driven by magnetic domain modification in LuFe$$_{2}$$O$$_{4}$$

Kambe, Takashi*; Fukada, Yukimasa*; Kano, Jun*; Nagata, Tomoko*; Okazaki, Hiroyuki*; Yokoya, Takayoshi*; Wakimoto, Shuichi; Kakurai, Kazuhisa; Ikeda, Naoshi*

Physical Review Letters, 110(11), p.117602_1 - 117602_5, 2013/03

https://doi.org/10.1103/PhysRevLett.110.117602
 Times Cited Count：26 Percentile：75.31(Physics, Multidisciplinary)

Oral presentation

High-speed synthesis of carbon nano-wall by carbon plasma

Kaneda, Miyu*; Mori, Minami*; Takahashi, Masakuni*; Fukada, Yukimasa; Yoshii, Kenji; Ikeda, Naoshi*; Kano, Jun*; Fujii, Tatsuo*

no journal, , 

no abstracts in English

Oral presentation

High-speed synthesis of carbon nano-wall by carbon plasma

Kaneda, Miyu*; Mori, Minami*; Takahashi, Masakuni*; Fukada, Yukimasa; Yoshii, Kenji; Ikeda, Naoshi*; Kano, Jun*; Fujii, Tatsuo*

no journal, , 

no abstracts in English

Oral presentation

None

Fukada, Yukimasa; Kawasaki, Ikuto; Fukuda, Tatsuo; Yu, H.*; Fujiwara, Kosuke*; Matsumura, Daiju; Yoshii, Kenji; Ikeda, Naoshi*

no journal, , 

no abstracts in English

Oral presentation

Magnetic and dielectric properties of Lu$$_{2}$$Fe$$_{3}$$O$$_{7}$$

Fukada, Yukimasa*; Yoshii, Kenji; Fujiwara, Kosuke*; Hayashi, Naoaki*; Fukuda, Tatsuo; Mizumaki, Masaichiro*; Shigematsu, Kei*; Azuma, Masaki*; Takeda, Masayasu; Ikeda, Naoshi*

no journal, , 

Magnetic and dielectric properties were investigated for poly and single crystalline Lu$$_{2}$$Fe$$_{3}$$O$$_{7}$$, a related oxide to the electronic ferroelectric RFe$$_{2}$$O$$_{4}$$ (R: rare earths). The magnetization measurements showed a ferrimagnetic transition at T$$_{N}$$=270 K. In addition, the temperature derivative showed the existence of a multiple magnetic transition. With cooling the sample, a broad transition occurs at 250-270 K, below which a sharp transition is observed. This result likely indicates the presence of multiple magnetic phases, rooted in the geometrical frustration on the triangular lattice. The dielectric measurements showed a possible correlation between magnetic and dielectric properties at about 120 K, at which both magnetization and AC susceptibility showed broad maxima. The other results will be presented at the conference.

Oral presentation

Direct energy conversion using Pt/Ga$$_{2}$$O$$_{3}$$ Schottky junction in $$^{241}$$Am gamma ray region

Fukuda, Tatsuo; Fukada, Yukimasa; Kobata, Masaaki; Yoshii, Kenji; Shobu, Takahisa; Tominaga, Aki; Yamashita, Yoshiyuki*; Tanida, Hajime; Yaita, Tsuyoshi

no journal, , 

no abstracts in English

Oral presentation

Negative magnetization in some perovskite and spinel oxides

Yoshii, Kenji; Fukada, Yukimasa; Fukuda, Tatsuo; Tsuji, Takuya; Matsumura, Daiju; Yaita, Tsuyoshi; Ikeda, Naoshi*

no journal, , 

no abstracts in English

Oral presentation

The Effect of electric field on carbon nano-wall synthesis and applied research

Kaneda, Miyu*; Mori, Minami*; Takahashi, Masakuni*; Fukada, Yukimasa; Yoshii, Kenji; Fukuda, Tatsuo; Yoshigoe, Akitaka; Kobata, Masaaki; Ikeda, Naoshi*; Kano, Jun*; et al.

no journal, , 

no abstracts in English

Oral presentation

None

Yu, H.*; Yano, Yuta*; Park, G.*; Okimoto, Yoichi*; Shimanuki, Shuhei*; Fukada, Yukimasa; Fujiwara, Kosuke*; Ikeda, Naoshi*

no journal, , 

no abstracts in English

Oral presentation

None

Yano, Yuta*; Yu, H.*; Park, G.*; Matsuda, Rikako*; Okimoto, Yoichi*; Fukada, Yukimasa; Fujiwara, Kosuke*; Nakao, Hironori*; Fukaya, Ryo*; Fujii, Tatsuo*; et al.

no journal, , 

no abstracts in English

Oral presentation

None

Fujiwara, Kosuke*; Yu, H.*; Kimura, Akito*; Fukada, Yukimasa; Ikeda, Naoshi*; Okimoto, Yoichi*; Frontzek, M. D.*; Kakurai, Kazuhisa*

no journal, , 

no abstracts in English

Oral presentation

Review on direct energy conversion using semiconductor junction from gamma ray region

Fukuda, Tatsuo; Fukada, Yukimasa; Kobata, Masaaki; Yoshii, Kenji; Shobu, Takahisa; Tominaga, Aki; Ieda, Junichi; Matsumura, Daiju; Yaita, Tsuyoshi

no journal, , 

no abstracts in English

Oral presentation

Direct energy conversion using Perovskite solar cell in synchrotron X-ray region

Fukuda, Tatsuo; Fukada, Yukimasa; Yoshii, Kenji; Shobu, Takahisa; Tominaga, Aki; Kobata, Masaaki; Ieda, Junichi; Shirai, Yasuhiro*; Yanagida, Masatoshi*; Miyano, Kenjiro*; et al.

no journal, , 

Direct energy conversion has been investigated so far using Ni/SiC or Pt/ Ga$$_2$$O$$_3$$ Schottky junctions with the irradiation of monochromatized synchrotron X-rays. From current-voltage measurements, the energy conversion efficiencies reached up to ~1.6%. Recently we have started measurements using Perovskite solar cell, which contains relatively heavy lead atom to absorb X-rays and is easier to cover wide area. In this talk we would like to discuss the results comparing with the Ni/SiC or Pt/Ga$$_2$$O$$_3$$ case.

Oral presentation

Direct energy conversion using Pt/Ga$$_{2}$$O$$_{3}$$ Schottky junction from gamma ray region

Fukuda, Tatsuo; Fukada, Yukimasa; Kobata, Masaaki; Yoshii, Kenji; Shobu, Takahisa; Tominaga, Aki; Yamashita, Yoshiyuki*; Tanida, Hajime; Yaita, Tsuyoshi

no journal, , 

no abstracts in English

Oral presentation

None

Fukada, Yukimasa; Aoyagi, Yumito*; Yokoyama, Misaki*; Horibe, Yoichi*; Kano, Jun*; Kaneda, Miyu*; Fujii, Tatsuo*; Yoshigoe, Akitaka; Kobata, Masaaki; Fukuda, Tatsuo; et al.

no journal, , 

no abstracts in English

28 (Records 1-20 displayed on this page)