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Journal Articles

Neutron powder diffraction and difference maximum entropy method analysis of protium- and deuterium-dissolved BaSn$$_{0.5}$$In$$_{0.5}$$O$$_{2.75+alpha}$$

Nagasaki, Takanori*; Shiotani, Shinya*; Igawa, Naoki; Yoshino, Masahito*; Iwasaki, Kota*; Fukazawa, Hiroshi; Utsumi, Wataru

Journal of Solid State Chemistry, 182(10), p.2632 - 2639, 2009/10

 Times Cited Count:5 Percentile:21.43(Chemistry, Inorganic & Nuclear)

We propose a new method, a difference maximum entropy method (MEM) analysis of the neutron diffraction data, for revealing the detailed structure around hydrogen atoms in proton-conducting oxides. This MEM analysis uses the differences between the structure factors of protium- and deuterium-dissolved crystals. Simulations demonstrate that it not only provides the distribution of hydrogen atoms alone, but also improves the spatial resolution of MEM mapping around hydrogen atoms. Applied to actual diffraction data of protium- and deuterium-dissolved BaSn$$_{0.5}$$In$$_{0.5}$$O$$_{2.75+alpha}$$ at 9 K, difference MEM analysis reveals that O-D bonds mostly tilt towards the second nearest oxygen atoms, and that the distributions of deuterium and oxygen atoms are probably insignificant in interstitial regions.

Journal Articles

Location of deuterium atoms in BaZr$$_{0.5}$$In$$_{0.5}$$O$$_{2.75+alpha}$$ by neutron powder diffraction

Nagasaki, Takanori*; Ito, Tsuyoshi*; Yoshino, Masahito*; Iwasaki, Kota*; Shiotani, Shinya*; Fukazawa, Hiroshi; Igawa, Naoki; Ishii, Yoshinobu*

Journal of Nuclear Science and Technology, 45(Suppl.6), p.122 - 127, 2008/09

 Times Cited Count:5 Percentile:37.69(Nuclear Science & Technology)

The neutron powder diffraction measurement was carried out at 10 K on the proton-conducting oxide BaZr$$_{0.5}$$In$$_{0.5}$$O$$_{2.75+alpha}$$ with and without dissolved D$$_{2}$$O. Obtained diffraction data were analyzed by the Rietveld method and the maximum entropy method. It was found that deuterium atoms were located close the 12$$h$$ site of the cubic perovskite structure with the space group ${it Pm}$-$$overline{3}$$${it m}$.

Journal Articles

Location of deuterium atoms in BaSn$$_{0.5}$$In$$_{0.5}$$O$$_{2.75+alpha}$$ at 77-473 K by neutron powder diffraction

Ito, Tsuyoshi*; Nagasaki, Takanori*; Iwasaki, Kota*; Yoshino, Masahito*; Matsui, Tsuneo*; Fukazawa, Hiroshi; Igawa, Naoki; Ishii, Yoshinobu

Solid State Ionics, 178(7-10), p.607 - 613, 2007/04

 Times Cited Count:7 Percentile:37(Chemistry, Physical)

no abstracts in English

Journal Articles

Location of deuterium atoms in BaSn$$_{0.5}$$In$$_{0.5}$$O$$_{2.75+alpha}$$ by neutron powder diffraction at 10 K

Ito, Tsuyoshi*; Nagasaki, Takanori*; Iwasaki, Kota*; Yoshino, Masahito*; Matsui, Tsuneo*; Igawa, Naoki; Ishii, Yoshinobu

Solid State Ionics, 178(1-2), p.13 - 17, 2007/01

 Times Cited Count:16 Percentile:59.64(Chemistry, Physical)

no abstracts in English

Journal Articles

The Determination of deuteron site in SrZr$$_{0.95}$$Sc$$_{0.05}$$O$$_{3-alpha}$$ by neutron powder diffraction

Ito, Tsuyoshi*; Nagasaki, Takanori*; Iwasaki, Kota*; Yoshino, Masahito*; Matsui, Tsuneo*; Igawa, Naoki; Ishii, Yoshinobu

Solid State Ionics, 177(26-32), p.2353 - 2356, 2006/10

 Times Cited Count:11 Percentile:48.8(Chemistry, Physical)

no abstracts in English

Journal Articles

Fusion materials and hydrogen

Nagasaki, Takanori*; Yamaguchi, Kenji; Konishi, Satoshi*

Nihon Genshiryoku Gakkai-Shi, 46(11), p.770 - 779, 2004/11

no abstracts in English

Journal Articles

Enthalpy and heat capacity of (Ca$$_{1-x}$$Pu$$_{x}$$)TiO$$_{3}$$(x=0 and 0.20)

Sato, Tsuyoshi*; Yamazaki, Satoshi*; Yamashita, Toshiyuki; Matsui, Tsuneo*; Nagasaki, Takanori*

Journal of Nuclear Materials, 294(1-2), p.135 - 140, 2001/04

 Times Cited Count:2 Percentile:20.38(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Thermal expansion of (Ca$$_{1-x}$$Pu$$_{x}$$)TiO$$_{3}$$

Sato, Tsuyoshi*; Hanajiri, Yutaka*; Yamashita, Toshiyuki; Matsui, Tsuneo*; Nagasaki, Takanori*

Journal of Nuclear Materials, 294(1-2), p.130 - 134, 2001/04

 Times Cited Count:5 Percentile:40.34(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Thermal expansion and solubility limits of plutonium-doped lanthanum zirconates

Yamazaki, Satoshi*; Yamashita, Toshiyuki; Matsui, Tsuneo*; Nagasaki, Takanori*

Journal of Nuclear Materials, 294(1-2), p.183 - 187, 2001/04

 Times Cited Count:39 Percentile:92.78(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Phase-transformation study of metastable tetragonal zirconia powder

Igawa, Naoki; Nagasaki, Takanori*; Ishii, Yoshinobu; Noda, Kenji; Ono, Hideo; Morii, Yukio; Fernandez-Baca, J. A.*

J. Mater. Sci., 33, p.4747 - 4758, 1998/00

 Times Cited Count:6 Percentile:32.47(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Contribution to the study of the U-Cs-Mo-I-O system

Ugajin, Mitsuhiro; Nagasaki, Takanori*; Ito, Akinori

Journal of Nuclear Materials, 230(3), p.195 - 207, 1996/00

 Times Cited Count:7 Percentile:55.69(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Reversible disproportionation of ZrCo under high temperature and hydrogen pressure

Konishi, Satoshi; Nagasaki, Takanori; Okuno, Kenji

Journal of Nuclear Materials, 223, p.294 - 299, 1995/00

 Times Cited Count:82 Percentile:98.76(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Equilibrium hydrogen pressure on the solid solutions of ZrCo-HfCo intermetallic compounds

Konishi, Satoshi; Nagasaki, Takanori; Hayashi, Takumi; Okuno, Kenji

Journal of Nuclear Materials, 223, p.300 - 304, 1995/00

 Times Cited Count:21 Percentile:87.03(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Improvements in ZrCo based tritium storage media

Konishi, Satoshi; Nagasaki, Takanori; Hayashi, Takumi; Okuno, Kenji

Fusion Technology, 26(3), p.668 - 672, 1994/11

no abstracts in English

Journal Articles

Thermal diffusivity of neutron-irradiated carbon-carbon composites

Matsuo, Hideto; Nagasaki, Takanori

Journal of Nuclear Materials, 217, p.300 - 303, 1994/00

 Times Cited Count:1 Percentile:18.18(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Crystal structure of metastable tetragonal zirconia by neutron powder diffraction study

Igawa, Naoki; Ishii, Yoshinobu; Nagasaki, Takanori; Morii, Yukio; Funahashi, Satoru; Ono, Hideo

Journal of the American Ceramic Society, 76(10), p.2673 - 2676, 1993/10

 Times Cited Count:45 Percentile:92.82(Materials Science, Ceramics)

no abstracts in English

Journal Articles

Steady-state hydrogen transport in a metal membrane exposed to hydrogen gas and/or a hydrogen ion beam; Reexamination of transport regime and synergistic effects

Nagasaki, Takanori; Ono, Hideo

J. Vac. Sci. Technol., A, 11(3), p.588 - 596, 1993/05

no abstracts in English

Journal Articles

Ion-driven permeation and surface recombination coefficient of deuterium for iron

Nagasaki, Takanori; Saido, Masahiro; ; Ono, Hideo

Journal of Nuclear Materials, 202, p.228 - 238, 1993/00

 Times Cited Count:9 Percentile:67.89(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Effect of neutron irradiation on dimensional changes of carbon-carbon composites

Matsuo, Hideto; Nagasaki, Takanori

Journal of Nuclear Materials, 207, p.330 - 332, 1993/00

 Times Cited Count:2 Percentile:52.05(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Electrical properties of cubic, stabilized, single ZrO$$_{2}$$-Gd$$_{2}$$O$$_{3}$$ crystals

T.Kang*; Nagasaki, Takanori; Igawa, Naoki; K.Il-Hium*; Ono, Hideo

Journal of the American Ceramic Society, 75(8), p.2297 - 2299, 1992/08

 Times Cited Count:16 Percentile:67.45(Materials Science, Ceramics)

no abstracts in English

39 (Records 1-20 displayed on this page)