JOPSS - Search Results

Journal Articles

Enhancement of electrical conductivity to metallization of Mn $_{3-x}$ FeO spinel and postspinel with elevating pressure

Yamanaka, Takamitsu*; Rahman, S.*; Nakamoto, Yuki*; Hattori, Takanori; Jang, B. G.*; Kim, D. Y.*; Mao, H.-K.*

Journal of Physics and Chemistry of Solids, 167, p.110721_1 - 110721_10, 2022/08

https://doi.org/10.1016/j.jpcs.2022.110721

Times Cited Count：1 Percentile：14.38(Chemistry, Multidisciplinary)

High-pressure neutron diffraction proved that MnFeO and MnFeO spinels transform into CaMnO-type structure above 18 GPa and 14 GPa, respectively. The transition pressure of Mn $_{3-x}$ FeO solutions decreases with increasing Mn content. Synchrotron X-ray Mssbauer experiments revealed that Fe $^{2+}$ and Fe $^{3+}$ distribution at the tetrahedral (A) and octahedral (B) sites in the spinel structure changes with pressure. MnFeO and MnFeO spinels are ferrimagnetic and the CaMnO-type phase is paramagnetic. The temperature dependence of resistivity indicates that both spinels are semiconductors wherein electrons hop between cations at the A and B sites. A pressure-induced shortening of B-B distance promoted conduction via greater electron mobility between adjacent B cations. The Fe $^{2+}$ and Fe $^{3+}$ occupancies at the B sites in MnFeO are much larger than those in MnFeO. The CaMnO-type phase is metallic. Theoretical calculation confirmed the metallic character and Fe d-orbitals strongly renormalized compared to Mn d-orbitals.

Journal Articles

Local Ir dedimerization followed by ligand-hole hopping in X-ray irradiated thiospinel

Hiraka, Haruhiro*; Matsumura, Daiju; Horigane, Kazumasa*; Mizuki, Junichiro*

Journal of Physics and Chemistry of Solids, 150, p.109870_1 - 109870_8, 2021/03

https://doi.org/10.1016/j.jpcs.2020.109870

Times Cited Count：0 Percentile：0(Chemistry, Multidisciplinary)

Journal Articles

HCM12A Cr-rich oxide layer investigation using 3D atom probe

Kikuchi, Kenji*; Okada, Noriyuki*; Kato, Mikio*; Uchida, Hiroshi*; Saito, Shigeru

Journal of Nuclear Materials, 450(1-3), p.237 - 243, 2014/07

https://doi.org/10.1016/j.jnucmat.2013.09.011

Times Cited Count：3 Percentile：23.79(Materials Science, Multidisciplinary)

Three-dimensional atom probe techniques were applied to the investigation on the oxide scale in 12Cr ferritic-martensitic steel, HCM12A. A duplex oxide scale was formed in lead bismuth eutectic at 450-500 $^{circ}$ C, during 5500 h. Samples were located 500-700 nm away from the boundary between magnetite and Fe-Cr spinel layers, while the total oxide layer thickness is 18 m. It detected super enrichment of Cr with a size of ten nm roughly, as well as depletion of Fe and enrichment of O at the same site. Surrounding the Cr super enrichment area, enrichment of Si was newly noticed due to the scanned profile of detected atom counts. It is also confirmed that Pb and Bi concentration in the observed spinel region is almost null or less than 0.01 atomic percent, which is possible detecting lowest limit.

Journal Articles

Microstructure and atomic disordering of magnesium aluminate spinel irradiated with swift heavy ions

Yamamoto, Tomokazu*; Shimada, Mikio*; Yasuda, Kazuhiro*; Matsumura, Sho*; Chimi, Yasuhiro; Ishikawa, Norito

Nuclear Instruments and Methods in Physics Research B, 245(1), p.235 - 238, 2006/04

https://doi.org/10.1016/j.nimb.2005.11.108

Times Cited Count：13 Percentile：65.77(Instruments & Instrumentation)

We have investigated the microstructure change and atomic disordering process in magnesium aluminate spinel, MgO Al $_{2}$ O $_{3}$ with =1.1 and 2.4, irradiated with swift heavy ions of 200-MeV Xe $^{14+}$ and 350-MeV Au $^{28+}$ . Transmission electron microscopy techniques of bright-field (BF) and high-resolution (HR) imaging, as well as high angular resolution electron channeling X-ray spectroscopy (HARECXS) are employed in quantitative analysis of irradiation-induced structural change. Ion tracks show columnar dark contrast of 4-7 nm in diameter at the incident surface in BF images. Strong strain contrast often arises among plural ion tracks formed closely. Clear lattice fringes are observed in HR images even inside the ion tracks. It indicates that the spinel crystals are not amorphized but partially disordered along the ion tracks. Quantitative HARECXS analysis shows that cation disordering progresses with ion fluence. It is revealed that the disordered regions are extended over 122 nm in diameter along the ion tracks.

Journal Articles

Magnetic field effects on the diffuse scattering of a spin-frustrated spinel ferrite ZnFe $_{2}$ O $_{4}$ single crystal

Kamazawa, Kazuya*; Katano, Susumu; Tsunoda, Yorihiko*

Physica B; Condensed Matter, B345(1-4), p.96 - 98, 2004/03

https://doi.org/10.1016/j.physb.2003.11.031

Times Cited Count：5 Percentile：29.73(Physics, Condensed Matter)

no abstracts in English

Journal Articles

Post-spinel transition in Mg $_{2}$ SiO $_{4}$ determined by high in situ X-ray diffractometry

Katsura, Tomoo*; Yamada, Hitoshi*; Shimmei, Toru*; Kubo, Atsushi*; Ono, Shigeaki*; Kanzaki, Masami*; Yoneda, Akira*; Walter, M. J.*; Ito, Eiji*; Urakawa, Satoru*; et al.

Physics of the Earth and Planetary Interiors, 136(1-2), p.11 - 24, 2003/04

https://doi.org/10.1016/S0031-9201(03)00019-0

Times Cited Count：174 Percentile：93.69(Geochemistry & Geophysics)

no abstracts in English

Journal Articles

Depth-dependent and surface damages in MgAl $_{2}$ O $_{4}$ and MgO irradiated with energetic iodine ions

Aruga, Takeo; Katano, Yoshio*; Omichi, Toshihiko*; Okayasu, Satoru; Kazumata, Yukio*; Jitsukawa, Shiro

Nuclear Instruments and Methods in Physics Research B, 197(1-2), p.94 - 100, 2002/11

https://doi.org/10.1016/S0168-583X(02)01359-9

Times Cited Count：9 Percentile：51.38(Instruments & Instrumentation)

no abstracts in English

Journal Articles

The Interpretation of surface damages in Al $_{2}$ O $_{3}$ , MgAl $_{2}$ O $_{4}$ and MgO irradiated with energetic iodine ions

Aruga, Takeo; Katano, Yoshio*; Omichi, Toshihiko*; Jitsukawa, Shiro

Surface & Coatings Technology, 158-159, p.444 - 448, 2002/09

no abstracts in English

Journal Articles

Mechanisms and kinetics of the post-spinel transformation in Mg $_{2}$ SiO $_{4}$

Kubo, Tomoaki*; Otani, Eiji*; Kato, Takumi*; Urakawa, Satoru*; Suzuki, Akio*; Kambe, Yuichi*; Funakoshi, Kenichi*; Utsumi, Wataru; Kikegawa, Takumi*; Fujino, Kiyoshi*

Physics of the Earth and Planetary Interiors, 129(1-2), p.153 - 171, 2002/01

https://doi.org/10.1016/S0031-9201(01)00270-9

Times Cited Count：50 Percentile：66.29(Geochemistry & Geophysics)

no abstracts in English

Journal Articles

Rock-like oxide fuel and inert matrix fuel

Yamashita, Toshiyuki

Nihon Genshiryoku Gakkai "Kodo Nenryo Gijutsu" Kenkyu Senmon Iinkai Hokokusho, p.467 - 474, 2001/00

no abstracts in English

Journal Articles

Formation of metastable assemblages and mechanisms of the grain-size reduction in the postspinel transformation of Mg $_{2}$ SiO $_{4}$

Kubo, Tomoaki*; Otani, Eiji*; Kato, Takumi*; Urakawa, Satoru*; Suzuki, Akio*; Kambe, Yuichi*; Funakoshi, Kenichi*; Utsumi, Wataru; Fujino, Kiyoshi*

Geophysical Research Letters, 27(6), p.807 - 810, 2000/03

https://doi.org/10.1029/1999GL008430

Times Cited Count：33 Percentile：61.94(Geosciences, Multidisciplinary)

no abstracts in English

Journal Articles

Radiation effects on MgAl $_{2}$ O $_{4}$ -stabilized ZrO $_{2}$ composite material under He $^{+}$ or Xe $^{2+}$ ion irradiation

Sasajima, N.*; Matsui, Tsuneo*; Furuno, Shigemi*; Hojo, Kiichi; Shiratori, Tetsuo

Nuclear Instruments and Methods in Physics Research B, 166-167, p.250 - 257, 2000/00

https://doi.org/10.1016/S0168-583X(99)00661-8

Times Cited Count：20 Percentile：76.44(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Development of rock-like fuels for plutonium annihilation of plutonium in LWRs

Yamashita, Toshiyuki; Akie, Hiroshi; Nitani, Noriko; Nakano, Yoshihiro; Nakamura, Takehiko; Shiratori, Tetsuo; Suzuki, Yasufumi

Proceedings of International Conference on Future Nuclear Systems (GLOBAL '99) (CD-ROM), p.8 - 0, 1999/00

no abstracts in English

Journal Articles

The Postspinel Phase Boundary in Mg $_{2}$ SiO $_{4}$ Determined by in Situ X-ray Diffraction

Irifune, Tetsuo*; Nishiyama, Norimasa*; Kuroda, Koji*; Inoue, Toru*; Isshiki, Maiko*; Utsumi, Wataru; Funakoshi, Kenichi*; Urakawa, Satoru*; Uchida, Takeyuki*; Katsura, Tomoo*; et al.

Science, 279(5357), p.1698 - 1700, 1998/03

https://doi.org/10.1126/science.279.5357.1698

Times Cited Count：206 Percentile：93.63(Multidisciplinary Sciences)

no abstracts in English

JAEA Reports

Thermal expantion and thermal conductivity of rock-like fuel

*; Kobayashi, Shinichi*; Shirasu, Noriko; Yamashita, Toshiyuki; Omichi, Toshihiko; Muromura, Tadasumi

JAERI-Research 97-083, 21 Pages, 1997/11

JAERI-Research-97-083.pdf:1.23MB

no abstracts in English

Journal Articles

Ion irradiation and annealing effects in Al $_{2}$ O $_{3}$ and MgAl $_{2}$ O $_{4}$

Furuno, Shigemi; Sasajima, Naohiko*; Hojo, Kiichi; *; *; Matsui, Tsuneo*; Muromura, Tadasumi

Nuclear Instruments and Methods in Physics Research B, 127-128, p.181 - 185, 1997/00

https://doi.org/10.1016/S0168-583X(97)00066-9

Times Cited Count：25 Percentile：85.76(Instruments & Instrumentation)

no abstracts in English

Journal Articles

In situ TEM study of radiation effect of spinel (MgAl $_{2}$ O $_{4}$ ) during helium- and xenon-ion irradiations

Sasajima, Naohiko*; Matsui, Tsuneo*; Furuno, Shigemi; Hojo, Kiichi; *; Muromura, Tadasumi; *

Proc. of Int. Conf. on Microstructures and Functions of Materials (ICMFM 96), 0, p.265 - 268, 1996/00

no abstracts in English

JAEA Reports

Effect of Temperature on Corrosion of Hastelloy XR Exposed to Simulated VHTR Environments

Shindo, Masami; ; ; Kondo, Tatsuo

JAERI-M 83-107, 20 Pages, 1983/07

JAERI-M-83-107.pdf:0.9MB

no abstracts in English

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Enhancement of electrical conductivity to metallization of Mn $_{3-x}$ FeO spinel and postspinel with elevating pressure

Local Ir dedimerization followed by ligand-hole hopping in X-ray irradiated thiospinel

HCM12A Cr-rich oxide layer investigation using 3D atom probe

Microstructure and atomic disordering of magnesium aluminate spinel irradiated with swift heavy ions

Magnetic field effects on the diffuse scattering of a spin-frustrated spinel ferrite ZnFe $_{2}$ O $_{4}$ single crystal

Post-spinel transition in Mg $_{2}$ SiO $_{4}$ determined by high in situ X-ray diffractometry

Depth-dependent and surface damages in MgAl $_{2}$ O $_{4}$ and MgO irradiated with energetic iodine ions

The Interpretation of surface damages in Al $_{2}$ O $_{3}$ , MgAl $_{2}$ O $_{4}$ and MgO irradiated with energetic iodine ions

Mechanisms and kinetics of the post-spinel transformation in Mg $_{2}$ SiO $_{4}$

Rock-like oxide fuel and inert matrix fuel

Formation of metastable assemblages and mechanisms of the grain-size reduction in the postspinel transformation of Mg $_{2}$ SiO $_{4}$

Radiation effects on MgAl $_{2}$ O $_{4}$ -stabilized ZrO $_{2}$ composite material under He $^{+}$ or Xe $^{2+}$ ion irradiation

Development of rock-like fuels for plutonium annihilation of plutonium in LWRs

The Postspinel Phase Boundary in Mg $_{2}$ SiO $_{4}$ Determined by in Situ X-ray Diffraction

Thermal expantion and thermal conductivity of rock-like fuel

Ion irradiation and annealing effects in Al $_{2}$ O $_{3}$ and MgAl $_{2}$ O $_{4}$

In situ TEM study of radiation effect of spinel (MgAl $_{2}$ O $_{4}$ ) during helium- and xenon-ion irradiations

Effect of Temperature on Corrosion of Hastelloy XR Exposed to Simulated VHTR Environments