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Journal Articles

Melting of Pb charge glass and simultaneous Pb-Cr charge transfer in PbCrO$$_{3}$$ as the origin of volume collapse

Yu, R.*; Hojo, Hajime*; Watanuki, Tetsu; Mizumaki, Masaichiro*; Mizokawa, Takashi*; Oka, Kengo*; Kim, H.*; Machida, Akihiko; Sakaki, Koji*; Nakamura, Yumiko*; et al.

Journal of the American Chemical Society, 137(39), p.12719 - 12728, 2015/10

 Times Cited Count:23 Percentile:65.97(Chemistry, Multidisciplinary)

no abstracts in English

Journal Articles

New PbTiO$$_{3}$$-type giant tetragonal compound Bi$$_{2}$$ZnVO$$_{6}$$ and its stability under pressure

Yu, R.*; Hojo, Hajime*; Oka, Kengo*; Watanuki, Tetsu; Machida, Akihiko; Shimizu, Keisuke*; Nakano, Kiho*; Azuma, Masaki*

Chemistry of Materials, 27(6), p.2012 - 2017, 2015/03

 Times Cited Count:21 Percentile:64.2(Chemistry, Physical)

no abstracts in English

Journal Articles

Suppression of temperature hysteresis in negative thermal expansion compound BiNi$$_{1-x}$$Fe$$_{x}$$O$$_{3}$$ and zero-thermal expansion composite

Nabetani, Koichiro*; Muramatsu, Yuya*; Oka, Kengo*; Nakano, Kiho*; Hojo, Hajime*; Mizumaki, Masaichiro*; Agui, Akane; Higo, Yuji*; Hayashi, Naoaki*; Takano, Mikio*; et al.

Applied Physics Letters, 106(6), p.061912_1 - 061912_5, 2015/02

 Times Cited Count:48 Percentile:89.86(Physics, Applied)

Negative thermal expansion (NTE) of BiNi$$_{1_x}$$Fe$$_x$$O$$_3$$ is investigated by dilatometric curves, synchrotron X-ray diffraction, and X-ray absorption spectroscopy. All samples (x=0.05-0.15) shows large NTE with the coefficient of linear thermal expansion which induced by charge transfer between Bi$$^{5+}$$ and Ni$$^{2+}$$ in the controlled temperature range near room temperature. Compared with Bi$$_{1_x}$$Ln$$_x$$NiO$$_3$$ (Ln: rare-earth elements), the thermal hysteresis that causes a problem for practical application is suppressed because random distribution of Fe in the Ni site changes the first order transition to second order-like transition.

Journal Articles

Superconductivity in noncentrosymmetric iridium silicide Li$$_2$$IrSi$$_3$$

Pyon, S.*; Kudo, Kazutaka*; Matsumura, Junichi*; Ishii, Hiroyuki*; Matsuo, Genta*; Nohara, Minoru*; Hojo, Hajime*; Oka, Kengo*; Azuma, Masaki*; Garlea, V. O.*; et al.

Journal of the Physical Society of Japan, 83(9), p.093706_1 - 093706_5, 2014/09

 Times Cited Count:26 Percentile:81.51(Physics, Multidisciplinary)

Journal Articles

New result in the production and decay of an isotope, $$^{278}$$113 of the 113th element

Morita, Kosuke*; Morimoto, Koji*; Kaji, Daiya*; Haba, Hiromitsu*; Ozeki, Kazutaka*; Kudo, Yuki*; Sumita, Takayuki*; Wakabayashi, Yasuo*; Yoneda, Akira*; Tanaka, Kengo*; et al.

Journal of the Physical Society of Japan, 81(10), p.103201_1 - 103201_4, 2012/10

 Times Cited Count:142 Percentile:97.35(Physics, Multidisciplinary)

An isotope of the 113th element, $$^{278}$$113, was produced in a nuclear reaction with a $$^{70}$$Zn beam on a $$^{209}$$Bi target. We observed six consecutive $$alpha$$ decays following the implantation of a heavy particle in nearly the same position in the semiconductor detector, in extremely low background condition. The fifth and sixth decays are fully consistent with the sequential decays of $$^{262}$$Db and $$^{258}$$Lr both in decay energies and decay times. This indicates that the present decay chain consisted of $$^{278}$$113, $$^{274}$$Rg (Z = 111), $$^{270}$$Mt (Z = 109), $$^{266}$$Bh (Z = 107), $$^{262}$$Db (Z = 105), and $$^{258}$$Lr (Z = 103) with firm connections. This result, together with previously reported results from 2004 and 2007, conclusively leads the unambiguous production and identification of the isotope $$^{278}$$113, of the 113th element.

Journal Articles

Colossal negative thermal expansion in BiNiO$$_{3}$$ induced by intermetallic charge transfer

Azuma, Masaki*; Chen, W.*; Seki, Hayato*; Czapski, M.*; Olga, S.*; Oka, Kengo*; Mizumaki, Masaichiro*; Watanuki, Tetsu; Ishimatsu, Naoki*; Kawamura, Naomi*; et al.

Nature Communications (Internet), 2, p.347_1 - 347_5, 2011/06

 Times Cited Count:283 Percentile:98.92(Multidisciplinary Sciences)

no abstracts in English

Journal Articles

Finding evolutionary relations beyond superfamilies; Fold-based superfamilies

Matsuda, Keiko*; Nishioka, Takaaki*; Kinoshita, Kengo*; Kawabata, Takeshi*; Go, Nobuhiro

Protein Science, 12(10), p.2239 - 2251, 2003/10

 Times Cited Count:10 Percentile:18.21(Biochemistry & Molecular Biology)

no abstracts in English

Oral presentation

Unusual volume change in Pb$$_{1-x}$$Sr$$_x$$CrO$$_3$$

Yu, R.*; Oka, Kengo*; Hojo, Hajime*; Azuma, Masaki*; Mizumaki, Masaichiro*; Agui, Akane; Inaguma, Yoshiyuki*; Mori, Daisuke*

no journal, , 

no abstracts in English

Oral presentation

Pb-Cr charge transfer in Pb$$_{1-x}$$Sr$$_x$$CrO$$_3$$

Yu, R.*; Oka, Kengo*; Hojo, Hajime*; Mizumaki, Masaichiro*; Agui, Akane; Mori, Daisuke*; Inaguma, Yoshiyuki*; Azuma, Masaki*

no journal, , 

no abstracts in English

Oral presentation

Charge transfer and negative thermal expansion of Bi$$_{1-x}$$Pb$$_{x}$$NiO$$_{3}$$

Nakano, Kiho*; Nabetani, Koichiro*; Azuma, Masaki*; Oka, Kengo*; Mizumaki, Masaichiro*; Agui, Akane; Ueda, Shigenori*

no journal, , 

no abstracts in English

Oral presentation

Local structure of "A-site glass", PbCrO$$_{3}$$

Watanuki, Tetsu; Mizumaki, Masaichiro*; Kim, H.*; Yu, R.*; Machida, Akihiko; Sakaki, Koji*; Nakamura, Yumiko*; Oka, Kengo*; Azuma, Masaki*

no journal, , 

no abstracts in English

Oral presentation

Development of X-ray pair distribution function (PDF) measurement in BL22XU at SPring-8 and its application to the local structural study of perovskite oxides

Watanuki, Tetsu; Machida, Akihiko; Kim, H.*; Sakaki, Koji*; Nakamura, Yumiko*; Yu, R.*; Azuma, Masaki*; Oka, Kengo*; Mizumaki, Masaichiro*

no journal, , 

no abstracts in English

Oral presentation

Study of reactor structure for next generation sodium fast reactor; Insertability of core assemblies considering deformation due to irradiation

Matsubara, Shinichiro*; Imaoka, Kengo*; Ikarimoto, Iwao*; Ogawa, Shinta*; Eto, Masao*; Kawasaki, Nobuchika

no journal, , 

Core assemblies installed in the core vessel deform during the normal operation due to swellings and irradiation creep. Insertability of core assemblies during fuel exchanges was studied with consideration of this deformation.

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