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Journal Articles

Polaronic nature of a muonium-related paramagnetic center in SrTiO$$_3$$

Ito, Takashi; Higemoto, Wataru; Koda, Akihiro*; Shimomura, Koichiro*

Applied Physics Letters, 115(19), p.192103_1 - 192103_4, 2019/11

 Times Cited Count:1 Percentile:50.13(Physics, Applied)

Journal Articles

Local structure analysis of PbTiO$$_3$$ in high-temperature cubic phase

Yoneda, Yasuhiro; Taniguchi, Hiroki*; Kitanaka, Yuki*; Noguchi, Yuji*

Ferroelectrics, 538(1), p.57 - 62, 2019/05

 Times Cited Count:0 Percentile:100(Materials Science, Multidisciplinary)

High-energy X-ray diffraction study was performed on lead titanate (PbTiO$$_3$$). Short-range order structure was revealed using atomic pair-distribution function (PDF) method. In the high-temperature cubic phase, there is a large deviation between local and average structure. Especially, Pb atoms deviated from the cubic lattice framework, but establish Pb-O-Pb random network.

Journal Articles

Structure of nitride layer formed on titanium alloy surface by N$$_{2}$$-gas exposure at high temperatures

Takeda, Yusuke; Iida, Kiyoshi*; Sato, Shinji*; Matsuo, Tadatoshi*; Nagashima, Yasuyuki*; Okubo, Nariaki; Kondo, Keietsu; Hirade, Tetsuya

JPS Conference Proceedings (Internet), 25, p.011023_1 - 011023_3, 2019/03

In this study, we prepared samples under two different conditions, (1) 810$$^{circ}$$C, for 600 min, and (2) 850$$^{circ}$$C, for 720 min. A depth-profile analysis of the surfaces of the samples is conducted through Doppler broadening (DB) measurements of positron annihilation $$gamma$$ rays using a slow positron beam. It was indicated that many of positrons annihilated in defects near the surface. According to the TEM image, there are nano-crystal grains near the surface and then positrons can diffuse in the grains and annihilate in defects at the grain boundaries. Furthermore, DB measurements indicated that there is a depth dependence on the chemical composition where positrons annihilate. EDS spectroscopy measurements also indicated that there is a depth dependence of impurities such as Vanadium. These results indicated change of the chemical composition at the grain boundaries.

Journal Articles

Raman scattering study of the ferroelectric phase transition in BaTi$$_2$$O$$_5$$

Tsukada, Shinya*; Fujii, Yasuhiro*; Yoneda, Yasuhiro; Moriwake, Hiroki*; Konishi, Ayako*; Akishige, Yukikuni*

Physical Review B, 97(2), p.024116_1 - 024116_7, 2018/02

 Times Cited Count:8 Percentile:21.46(Materials Science, Multidisciplinary)

Uniaxial ferroelectric BaTi$$_2$$O$$_5$$ with a Curie temperature $$T_{rm C}$$ of 743 K was investigated to clarify its paraelectric-ferroelectric phase transition behavior. The mechanism is discussed on the basis of the structure from short to long ranges determined by synchrotron X-ray diffraction and the lattice dynamics probed by Raman spectroscopy. Using a combination of experimental results and first-principles calculations, we explain the phase transition. Ti vibration of TiO$$_6$$ octahedral units is frozen in the ferroelectric phase and the space group changes from nonpolar $$C2/m$$ to polar $$C2$$.

Journal Articles

Structure of nitride layer formed on titanium alloy surface by N$$_{2}$$-gas exposure at high temperatures

Takeda, Yusuke; Iida, Kiyoshi*; Sato, Shinji*; Matsuo, Tadatoshi*; Nagashima, Yasuyuki*; Okubo, Nariaki; Kondo, Keietsu; Hirade, Tetsuya

Journal of Physics; Conference Series, 791(1), p.012022_1 - 012022_4, 2017/02

 Times Cited Count:0 Percentile:100

Titanium alloy is widely used for applications such as golf club heads and structural materials for aircrafts. The surface can be exceedingly hardened by nitriding treatment that initiates defects, but there are some difficulties on use of titanium nitride because the layer can be exfoliated by stress. Therefore, we prepared samples in two different treatment conditions, (1) 810$$^{circ}$$C 600 min and (2) 850$$^{circ}$$C 720 min and performed depth profile analysis of Doppler broadening of positron annihilation $$gamma$$-rays (DB) for these samples. According to a calculation of nitrogen diffusion depth, the nitride layer should be only about 0.05-0.1$$mu$$m. However, the depth profile analysis of the DB measurement indicated that the defects introduced by nitriding treatment extended to a depth of 0.5$$mu$$m.

Journal Articles

Corrosion behavior of pure titanium in high pH solution under $$gamma$$ irradiation

Yukawa, Takuji*; Inoue, Hiroyuki*; Kojima, Takao*; Iwase, Akihiro*; Taniguchi, Naoki; Tachikawa, Hirokazu*

Zairyo To Kankyo 2016 Koenshu (CD-ROM), p.359 - 362, 2016/05

The immersion tests of pure titanium were carried out in aqueous solution containing carbonate/bicarbonate with 50 mM-chloride ion under gamma irradiation. The effect of pH on general corrosion rate of titanium were studied. The experimental results showed that the concentration of hydrogen preoxide was increased with pH, and the corrosion rate increased with the hydrogen preoxide concentration. The corrosion rate in pH12 and 13 were 5 to10 times larger than those under unirradiated conditions.

Journal Articles

Improvement effects of TiCl$$_{3}$$ on dehydrogenation of magnesium borohydride Mg(BH$$_{4}$$)$$_{2}$$

Li, H.-W.*; Matsumura, Daiju; Nishihata, Yasuo; Akiba, Etsuo*; Orimo, Shinichi*

Nippon Kinzoku Gakkai-Shi, 77(12), p.627 - 630, 2013/12

 Times Cited Count:3 Percentile:69.9(Metallurgy & Metallurgical Engineering)

no abstracts in English

Journal Articles

Blister formation in rutile TiO$$_{2}$$(100) films by helium irradiation

Yamamoto, Shunya; Nagata, Shinji*; Takeyama, Akinori; Yoshikawa, Masahito

Nuclear Instruments and Methods in Physics Research B, 249(1-2), p.374 - 376, 2006/08

 Times Cited Count:7 Percentile:49.84(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Development of high-repetition-rate LD pumped Nd:YAG laser and its application

Kiriyama, Hiromitsu; Yamakawa, Koichi

Laser Physics, 16(4), p.666 - 672, 2006/04

 Times Cited Count:4 Percentile:74.68(Optics)

no abstracts in English

Journal Articles

Vapor species evolved from Li$$_{2}$$TiO$$_{3}$$ heated at high temperature under various conditions

Hoshino, Tsuyoshi; Yasumoto, Masaru*; Tsuchiya, Kunihiko; Hayashi, Kimio; Nishimura, Hidetoshi*; Suzuki, Akihiro*; Terai, Takayuki*

Fusion Engineering and Design, 81(1-7), p.555 - 559, 2006/02

 Times Cited Count:13 Percentile:31.31(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Characterization of sulfur-doped TiO$$_{2}$$ films by RBS/C

Yamamoto, Shunya; Takeyama, Akinori; Yoshikawa, Masahito

Nuclear Instruments and Methods in Physics Research B, 242(1-2), p.377 - 379, 2006/01

 Times Cited Count:8 Percentile:45.46(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Effects of gelation and sintering conditions on granulation of Li$$_{2}$$TiO$$_{3}$$ pebbles from Li-Ti complex solution

Tsuchiya, Kunihiko; Kawamura, Hiroshi; Casadio, S.*; Alvani, C.*

Fusion Engineering and Design, 75-79, p.877 - 880, 2005/11

 Times Cited Count:22 Percentile:16.18(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Behavior on Li$$_{2}$$TiO$$_{3}$$ under varied surface condition

Olivares, R.*; Oda, Takuji*; Oya, Yasuhisa*; Tanaka, Satoru*; Tsuchiya, Kunihiko

Fusion Engineering and Design, 75-79, p.765 - 768, 2005/11

 Times Cited Count:8 Percentile:46.2(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Non-stoichiometry of Li$$_{2}$$TiO$$_{3}$$ under hydrogen atmosphere condition

Hoshino, Tsuyoshi; Tsuchiya, Kunihiko; Hayashi, Kimio; Terai, Takayuki*; Tanaka, Satoru*; Takahashi, Yoichi*

Fusion Engineering and Design, 75-79, p.939 - 943, 2005/11

 Times Cited Count:9 Percentile:42.46(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Control of particle size and density of Li$$_{2}$$TiO$$_{3}$$ pebbles fabricated by indirect wet processes

Tsuchiya, Kunihiko; Kawamura, Hiroshi; Takayama, Tomoo*; Kato, Shigeru*

Journal of Nuclear Materials, 345(2-3), p.239 - 244, 2005/10

 Times Cited Count:35 Percentile:7.76(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Quasi-monoenergetic electron beam generation during laser pulse interaction with very low density plasmas

Yamazaki, Atsushi; Kotaki, Hideyuki; Daito, Izuru; Kando, Masaki; Bulanov, S. V.; Esirkepov, T. Z.; Kondo, Shuji; Kanazawa, Shuhei; Homma, Takayuki*; Nakajima, Kazuhisa; et al.

Physics of Plasmas, 12(9), p.093101_1 - 093101_5, 2005/09

 Times Cited Count:69 Percentile:8.56(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Blister formation in rutile TiO$$_{2}$$ (100) thin films by helium ion implantation

Yamamoto, Shunya; Nagata, Shinji*; Takeyama, Akinori; Yoshikawa, Masahito

Transactions of the Materials Research Society of Japan, 30(3), p.789 - 792, 2005/09

no abstracts in English

JAEA Reports

Li depletion effects on Li$$_{2}$$TiO$$_{3}$$ reaction with H$$_{2}$$ in thermo-chemical environment relevant to breeding blanket for fusion power plants

Alvani, C.*; Casadio, S.*; Contini, V.*; Giorgi, R.*; Mancini, M. R.*; Tsuchiya, Kunihiko; Kawamura, Hiroshi

JAERI-Review 2005-024, 28 Pages, 2005/07

JAERI-Review-2005-024.pdf:5.73MB

no abstracts in English

Journal Articles

Neutronics experiments using small partial mockups of the ITER test blanket module with a solid breeder

Sato, Satoshi; Verzilov, Y. M.; Nakao, Makoto*; Ochiai, Kentaro; Wada, Masayuki*; Nishitani, Takeo

Fusion Science and Technology, 47(4), p.1046 - 1051, 2005/05

 Times Cited Count:12 Percentile:32.39(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

Low temperature tritium release experiment from lithium titanete breeder material

Tsuchiya, Kunihiko; Kawamura, Hiroshi; Nakamichi, Masaru*; Sagawa, Hisashi

JAERI-Tech 2005-013, 56 Pages, 2005/03

JAERI-Tech-2005-013.pdf:6.4MB

no abstracts in English

219 (Records 1-20 displayed on this page)