JOPSS - Search Results

Journal Articles

Stoichiometric study of the dielectric and magnetic properties in charge frustrated system LuFe $_{2}$ O $_{4}$

Michiuchi, Takamasa*; Yokota, Yusuke*; Komatsu, Takuma*; Hayakawa, Hironori*; Kuroda, Tomoko*; Maeda, Daisuke*; Matsuo, Yoji*; Mori, Shigeo*; Yoshii, Kenji; Hanasaki, Noriaki*; et al.

Ferroelectrics, 378(1), p.175 - 180, 2009/00

https://doi.org/10.1080/00150190902859187

Times Cited Count：18 Percentile：59.55(Materials Science, Multidisciplinary)

We have synthesized the samples of LuFe $_{2}$ O $_{4}$ , which shows the ferroelectricity due to charge ordering of Fe ions, under several different reducing conditions using a CO $_{2}$ -CO flow. The reducing condition was changed by changing a flow ratio of CO $_{2}$ and CO. It was found that the flow ratio of CO $_{2}$ /CO of about 5 provided the sample with the highest magnetic transition temperature of 240-250 K. This sample showed the dielectric constant of 10000 at room temperature. The imaginary part of the dielectric response offered the activation energy of 0.4-0.5 eV, which is slightly larger than that reported previously (about 0.3 eV). We will perform further investigation of the physical properties of this sample to clarify full details and their origin of LuFe $_{2}$ O $_{4}$ .

Journal Articles

Magnetic and dielectric properties of HoFe $_{2}$ O $_{4}$ and R $_{1-x}$ R' $_{x}$ Fe $_{2}$ O $_{4}$ (R, R': rare earths)

Yoshii, Kenji; Yoneda, Yasuhiro; Maeda, Daisuke*; Yokota, Yusuke*; Michiuchi, Takamasa*; Komatsu, Takuma*; Ikeda, Naoshi*; Matsuo, Yoji*; Mori, Shigeo*

Japanese Journal of Applied Physics, 47(9), p.7599 - 7602, 2008/09

https://doi.org/10.1143/JJAP.47.7599

Times Cited Count：8 Percentile：33.23(Physics, Applied)

We have investigated the physical properties of HoFe $_{2}$ O $_{4}$ and R $_{1-x}$ R' $_{x}$ Fe $_{2}$ O $_{4}$ (R, R': rare earths). Dielectric measurements showed their dielectric constants of 1000 at around room temperature, which is characteristic of the RFe $_{2}$ O $_{4}$ series (R: rare earths). However, the magnetic transition temperatures and the coherency in dielectric response were found to be different from those of RFe $_{2}$ O $_{4}$ reported so far. Interestingly, these materials suggested higher ferroelectric temperatures than those reported so far, suggesting a possibility of application of these materials.

Oral presentation

Nuclear demagnetization ultra-low temperaure stage for neutron scattering experiments

Metoki, Naoto; Abe, Satoshi*; Nagasaki, Fuminori*; Mori, Takuma*; Matsumoto, Koichi*; Suzuki, Haruhiko*; Kaneko, Koji; Koike, Yoshihiro*

no journal, ,

We report a nuclear demagnetization ultra-low temperature stage, which is under construction for the neutron scattering experiments below 1 mK. This stage will be used for the study of heavy fermion nature, or multiple ordering in f electron compounds.

Oral presentation

Dielectric properties on charge ordered ferroelectrics LuFe $_{2}$ O $_{4}$

Ikeda, Naoshi*; Kambe, Takashi*; Komatsu, Takuma*; Michiuchi, Takamasa*; Hayakawa, Hironori*; Hanasaki, Noriaki*; Yoshii, Kenji; Matsuo, Yoji*; Mori, Shigeo*

no journal, ,

A review will be given on the new type of ferroelectric material LuFe $_{2}$ O $_{4}$ . This oxide becomes ferroelectric below about 330 K, owing to the charge-ordered arrangement of Fe ions on a triangular lattice: This is a novel mechanism of ferroelectricity. We discuss the experimental results obtained from resonant X-ray diffraction, dielectric response, polarization and magnetization to show some interesting properties of this new ferroelectric oxide.

Oral presentation

Investigations of personal dose characteristics involved Fukushima Daiichi reactor accident, 4; Field test, 2; Response of the personal dosemeter on the phantoms and result of a measurement of the ambient dose and the energy spectrum of rays

Yamazaki, Takumi; Takada, Chie; Nakamura, Keisuke; Sagawa, Naoki; Hoshi, Katsuya; Nakagawa, Takahiro; Takimoto, Misaki; Tanimura, Yoshihiko*; Takahashi, Fumiaki; Momose, Takumaro; et al.

no journal, ,

no abstracts in English

Oral presentation

Estimation of groundwater replacement by shallow water around deep underground facility based on $^{3}$ H and CFCs concentrations

Iwatsuki, Teruki; Omori, Kazuaki; Hagiwara, Hiroki; Hasegawa, Takuma*; Nakata, Kotaro*

no journal, ,

Appricability of tritium and CFCs as an tracer of shallow water infiltration into deep was evaluated at Mizunami underground reserach laboratory. The observation results show that the infiltration of shallow water increases with time. Especially CFCs is avairable tracer for groundwater with the residence time of several tens years.

Oral presentation

Progress in development of a wide band polarizer for ECCD system in JT-60SA

Horie, Naoyuki*; Sai, Takuma*; Omori, Kohei*; Saigusa, Mikio*; Kobayashi, Takayuki; Moriyama, Shinichi; Arata, Hiroshi*; Uno, Tsuyoshi*

no journal, ,

no abstracts in English

Oral presentation

Development of crown-ether-derivative impregnated fiber for in-situ analysis of $^{90}$ Sr; Study of safe Sr adsorption with no nitric acid

Konda, Miki; Horita, Takuma; Asai, Shiho; Hanzawa, Yukiko; Saito, Kyoichi*; Fujiwara, Kunio*; Sugo, Takanobu*; Ishimori, Kenichiro; Kameo, Yutaka

no journal, ,

no abstracts in English

Oral presentation

Development of crown-ether-derivative impregnated fiber for in-situ analytical method of $^{90}$ Sr; Study of safe Sr adsorption operation without using nitric acid

Konda, Miki; Horita, Takuma; Asai, Shiho*; Hanzawa, Yukiko; Saito, Kyoichi*; Fujiwara, Kunio*; Sugo, Takanobu*; Ishimori, Kenichiro; Kameo, Yutaka

no journal, ,

no abstracts in English

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Stoichiometric study of the dielectric and magnetic properties in charge frustrated system LuFe $_{2}$ O $_{4}$

Magnetic and dielectric properties of HoFe $_{2}$ O $_{4}$ and R $_{1-x}$ R' $_{x}$ Fe $_{2}$ O $_{4}$ (R, R': rare earths)

Nuclear demagnetization ultra-low temperaure stage for neutron scattering experiments

Dielectric properties on charge ordered ferroelectrics LuFe $_{2}$ O $_{4}$

Investigations of personal dose characteristics involved Fukushima Daiichi reactor accident, 4; Field test, 2; Response of the personal dosemeter on the phantoms and result of a measurement of the ambient dose and the energy spectrum of rays

Estimation of groundwater replacement by shallow water around deep underground facility based on $^{3}$ H and CFCs concentrations

Progress in development of a wide band polarizer for ECCD system in JT-60SA

Development of crown-ether-derivative impregnated fiber for in-situ analysis of $^{90}$ Sr; Study of safe Sr adsorption with no nitric acid

Development of crown-ether-derivative impregnated fiber for in-situ analytical method of $^{90}$ Sr; Study of safe Sr adsorption operation without using nitric acid