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Journal Articles

Tuning strain-induced -to- martensitic transformation of biomedical Co-Cr-Mo alloys by introducing parent phase lattice defects

Mori, Manami*; Yamanaka, Kenta*; Sato, Shigeo*; Tsubaki, Shinki*; Sato, Kozue*; Kumagai, Masayoshi*; Imafuku, Muneyuki*; Shobu, Takahisa; Chiba, Akihiko*

Journal of the Mechanical Behavior of Biomedical Materials, 90, p.523 - 529, 2019/02

https://doi.org/10.1016/j.jmbbm.2018.10.038

Times Cited Count：19 Percentile：70.43(Engineering, Biomedical)

Journal Articles

Infrared spectroscopic study of OH defects in monazite

Abe, Takeyasu; Kuribayashi, Takahiro*; Nakamura, Michihiko*

European Journal of Mineralogy, 29(6), p.949 - 957, 2017/12

https://doi.org/10.1127/ejm/2017/0029-2663

Times Cited Count：2 Percentile：6.18(Mineralogy)

Polarised infrared spectra of synthetic single crystals and radiation-damaged natural samples were collected to examine hydroxyl incorporation in monazite. The IR spectra of pure synthetic monazite contain two OH stretching bands at 3163 and 3335 cm $^{-1}$ with contrasting bandwidths of 40 and 90 cm $^{-1}$ , respectively. The two OH bands show strong pleochroism and dominant infrared absorption in the Y direction. The IR spectra of natural monazite contains a weak pleochroic OH band centered around 3400 cm $^{-1}$ with a bandwidth of more than 200 cm $^{-1}$ . During step-heating experiments, this broad OH band split into several bands, and these bands differ from those observed in the spectra of synthetic samples. The OH stretching signals in the spectra of both natural and synthetic samples disappeared after heating at 1000 $^{circ}$ C. Based on these results, OH defects in natural monazite arise because of secondary hydration facilitated by radiation damage, as in the case of natural zircon and xenotime.

Journal Articles

FT-IR study on interaction of irradiated deuteron with defects in Li $_{2}$ O

Tanigawa, Hisashi; Tanaka, Satoru*; Enoeda, Mikio; Akiba, Masato

Journal of Nuclear Materials, 329-333(2), p.1291 - 1294, 2004/08

https://doi.org/10.1016/j.jnucmat.2004.04.228

Times Cited Count：4 Percentile：29.18(Materials Science, Multidisciplinary)

In order to elucidate the interaction of hydrogen isotopes with irradiation defects, infrared absorption spectroscopy was conducted for a single crystal of Li $_{2}$ O. Using FT-IR, O-D stretching vibration from the bulk Li $_{2}$ O was observed under deutron irradiation. Under and after the irradiation, several peaks were observed in the O-D stretching vibration region and these peaks had different dependence on conditions of the irradiation. From the observed behaviour of the peaks, it was suggested that most of the irradiated deutron existed in Li $_{2}$ O without O-D bonding because of interaction with the defects.

Journal Articles

Hydrogen migration in electron irradiated Pd based dilute alloys around the 50 K anomaly

Yamakawa, Koji*; Chimi, Yasuhiro; Ishikawa, Norito; Iwase, Akihiro*

Journal of Alloys and Compounds, 370(1-2), p.211 - 216, 2004/05

https://doi.org/10.1016/j.jallcom.2003.09.037

Times Cited Count：1 Percentile：12.41(Chemistry, Physical)

The migration of hydrogen in Pd-1at.% Fe-H and Pd-1at.% Ag-H alloys is investigated by electrical resistivity measurement around 50 K. The disordered hydrogen atoms are introduced by electron irradiation with 0.5 MeV electrons below 15 K. The disordered atoms order by migration of hydrogen atoms during the heating-up of the specimens. The recovery curves of electrical resistivity have two sub-stages for electron irradiated specimens and one stage for fast cooled specimens. The migration energy of hydrogen is obtained from the kinetic analysis of the resistivity change due to the ordering, using the cross-cut method for the electron irradiated specimen and fast cooled specimen. The obtained value of the migration energy for the low temperature stage is smaller than that for the high temperature stage. The value for the high temperature stage is similar to the energy for the case of fast cooling. The difference between the hydrogen atoms disordered by irradiation and that by fast cooling is discussed for Pd based alloys.

Journal Articles

Defect production and radiation annealing in platinum irradiated with high-energy heavy ions

Chimi, Yasuhiro; Iwase, Akihiro; Iwata, Tadao*

Nuclear Instruments and Methods in Physics Research B, 209, p.159 - 164, 2003/08

https://doi.org/10.1016/S0168-583X(02)02009-8

Times Cited Count：2 Percentile：21.23(Instruments & Instrumentation)

Accumulation of defects during energetic ion irradiation below 10K in platinum thin films is studied by electrical resistivity measurements. Experimental results are analyzed by using a model which describes the production and selective radiation annealing of defects. For high-energy (100MeV) heavy ion irradiations, radiation annealing process due to electronic excitation is found mainly at the initial stage of irradiation. From the defect accumulation curve and defect recovery spectra, the effective temperature corresponding to the lattice agitation induced by electronic excitation is estimated.

Journal Articles

Irradiation effects on thermal expansion of SiC/SiC composite materials

Ishihara, Masahiro; Baba, Shinichi; Hoshiya, Taiji; Shikama, Tatsuo*

Journal of Nuclear Materials, 307-311(Part2), p.1168 - 1172, 2002/12

https://doi.org/10.1016/S0022-3115(02)01056-5

Times Cited Count：5 Percentile：34.51(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Irradiation effects on MgB $_{2}$ bulk samples and formation of columner defects on high-Tc supercoductor

Okayasu, Satoru; Sasase, Masato; Hojo, Kiichi; Chimi, Yasuhiro; Iwase, Akihiro; Ikeda, Hiroshi*; Yoshizaki, Ryozo*; Kambara, Tadashi*; Sato, H.*; Hamatani, Yutaro*; et al.

Physica C, 382(1), p.104 - 107, 2002/10

https://doi.org/10.1016/S0921-4534(02)01206-6

Times Cited Count：28 Percentile：75.35(Physics, Applied)

no abstracts in English

Journal Articles

Radiation induced segregation and freely migrating defects

Iwase, Akihiro

Materia, 41(1), p.20 - 27, 2002/01

http://ci.nii.ac.jp/naid/10008836402

no abstracts in English

Journal Articles

Effects of defect morphology on the properties of vortex system in Bi $_{2}$ Sr $_{2}$ CaCu $_{2}$ O $_{8+delta}$ irradiated with GeV heavy ions

Kuroda, N.; Ishikawa, Norito; Chimi, Yasuhiro; Iwase, Akihiro; Ikeda, Hiroshi*; Yoshizaki, Ryozo*; Kambara, Tadashi*

Physical Review B, 63(22), p.224502_1 - 224502_5, 2001/06

https://doi.org/10.1103/PhysRevB.63.224502

Times Cited Count：9 Percentile：47.99(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Heat capacity measurements on unirradiated and irradiated fuel pellets

Amaya, M.*; Une, Katsumi*; Minato, Kazuo

Journal of Nuclear Materials, 294(1-2), p.1 - 7, 2001/04

https://doi.org/10.1016/S0022-3115(01)00450-0

Times Cited Count：12 Percentile：64.65(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Thermal conductivities of irradiated UO $_{2}$ and (U,Gd)O $_{2}$

Minato, Kazuo; Shiratori, Tetsuo; Serizawa, Hiroyuki; Hayashi, Kimio; Une, Katsumi*; Nogita, Kazuhiro*; Hirai, Mutsumi*; Amaya, M.*

Journal of Nuclear Materials, 288(1), p.57 - 65, 2001/01

https://doi.org/10.1016/S0022-3115(00)00578-X

Times Cited Count：21 Percentile：80.2(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

In-pile and post-irradiation creep of type 304 stainless steel under different neutron spectra

Kurata, Yuji; Itabashi, Yukio; Mimura, Hideaki*; Kikuchi, Taiji; Amezawa, Hiroo; Shimakawa, Satoshi; Tsuji, Hirokazu; Shindo, Masami

Journal of Nuclear Materials, 283-287(Part.1), p.386 - 390, 2000/12

https://doi.org/10.1016/S0022-3115(00)00107-0

Times Cited Count：6 Percentile：42.55(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Optical ionization of DX center in AlGaAs:Se by inner-shell excitation

Yoshino, Yoko; Takarabe, Kenichi*; Ishii, Masashi*; Katayama, Yoshinori; Shimomura, Osamu

Physica B; Condensed Matter, 273-274, p.781 - 783, 1999/12

https://doi.org/10.1016/S0921-4526(99)00648-1

Times Cited Count：1 Percentile：8.71(Physics, Condensed Matter)

DX state is strongly localized. This nature could be investigated by observing relaxation process of localized electrons to emptied inner shells. We have found two different optical ionization process of the DX center in Al $_{x}$ Ga $_{1-x}$ As:Se (x=0.33, $N_{rm Se}=5times10^{17}$ (cm $^{-3}$ )) by using synchrotron radiation. They are tentatively assigned to be a direct lift of an inner-shell electron to the conduction band (CB) followed by a capture of an electron at the DX center to the emptied inner shell $({rm DX}^{-}+hnu ({rm L,}$ K-edge $)rightarrow {rm DX}^{0}+e_{rm CB})$ and the Auger ionization of one electron of the DX center to the CB followed by a capture of another electron to the emptied inner shell $({rm DX}^{-}+hnu ({rm L,}$ K-edge $)rightarrow {rm DX}^{+}+e_{rm CB}+e_{rm vacuum})$ .