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Fe
O
spinel and postspinel with elevating pressureYamanaka, 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
Times Cited Count：1 Percentile：15.7(Chemistry, Multidisciplinary)High-pressure neutron diffraction proved that MnFe
O and MnFeO spinels transform into CaMnO-type structure above 18 GPa and 14 GPa, respectively. The transition pressure of MnFeO solutions decreases with increasing Mn content. Synchrotron X-ray M
ssbauer experiments revealed that Fe
and Fe
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 and Fe 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.
based on experimental data and density functional theory calculation resultWatanabe, Masashi; Nakamura, Hiroki; Suzuki, Kiichi; Machida, Masahiko; Kato, Masato
Journal of the American Ceramic Society, 105(3), p.2248 - 2257, 2022/03
Times Cited Count：1 Percentile：6.98(Materials Science, Ceramics)Properties of CeO
were evaluated by DFT simulation to determine band gap, Frenkel defect formation energy and defect migration energy. Band gap and Frenkel defect formation energy were used to analyze defect equilibria. Oxygen partial pressure dependence of defect equilibria was evaluated based on oxygen potential experimental data and DFT calculation, and a Brouwer diagram was derived. The defect formation energies, including Frenkel defect, electron-hole pair and so on, were determined and used to evaluate the properties, including oxygen diffusion coefficients, electrical conduction, heat capacity and thermal conductivity. Mechanisms of various properties were discussed for a deeper understanding based on defect chemistry, and the relationship among properties were systematically described.
pre-concentration of Sr from large volume of freshwater sample using Powdex resinTomita, Jumpei; Yamamoto, Masayoshi*; Nozaki, Teo; Tanimura, Yoshihiko*; Oishi, Tetsuya
Journal of Environmental Radioactivity, 146, p.88 - 93, 2015/08
Times Cited Count：12 Percentile：35.16(Environmental Sciences)Sugai, Hiroyuki; Matsunami, Noriaki*; Fukuoka, Osamu*; Sataka, Masao; Kato, Teruo; Okayasu, Satoru; Shimura, Tetsuo*; Tazawa, Masato*
Nuclear Instruments and Methods in Physics Research B, 250(1-2), p.291 - 294, 2006/09
Times Cited Count：15 Percentile：70.56(Instruments & Instrumentation)We have investigated the effects on electrical properties of Al-doped ZnO (AZO) semiconductor films induced by high-energy heavy ion. The AZO films with c-axis on SiO glass substrate were prepared by a RF-sputter-deposition method at 400 
C. Rutherford backscattering spectroscopy shows that the Al/Zn composition and the film thickness are 4 % and 0.3 
m. We find that the conductivity monotonically increases from 1.5
10
to 810 S/cm with increasing the fluence up to 410
/cm, as already been observed for 100 keV Ne irradiation. The fluence of 100 keV Ne at which the conductivity takes its maximum is 310
/cm (7 dpa). The dpa of 100 MeV Xe at 410/cm is estimated as 0.008. Hence, the conductivity increase by 100 MeV Xe ion is ascribed to the electronic excitation effects.
Fukuoka, Osamu*; Matsunami, Noriaki*; Tazawa, Masato*; Shimura, Tetsuo*; Sataka, Masao; Sugai, Hiroyuki; Okayasu, Satoru
Nuclear Instruments and Methods in Physics Research B, 250(1-2), p.295 - 299, 2006/09
Times Cited Count：24 Percentile：83(Instruments & Instrumentation)We have investigated the effects on electrical and optical properties of Al-doped ZnO (AZO) semiconductor films induced by high-energy heavy ion. The AZO films with c-axis on SiO glass substrate were prepared by a RF-sputter-deposition method at 400 C. Rutherford backscattering spectroscopy shows that the Al/Zn composition and the film thickness are 4 % and 0.3 m. No appreciable change was observed in optical transparency. We find that the conductivity monotonically increases from 1.510 to 810 S/cm with increasing the fluence up to 410/cm, as already been observed for 100 keV Ne irradiation. The fluence of 100 keV Ne at which the conductivity takes its maximum is 310/cm (7 dpa). The dpa of 100 MeV Xe at 410/cm is estimated as 0.008. Hence, the conductivity increase by 100 MeV Xe ion is ascribed to the electronic excitation effects.
(T=Fe, Rh and Ni)Aoki, Dai*; Homma, Yoshiya*; Shiokawa, Yoshinobu; Sakai, Hironori; Yamamoto, Etsuji; Nakamura, Akio; Haga, Yoshinori; Settai, Rikio*; Onuki, Yoshichika
Journal of the Physical Society of Japan, 74(8), p.2323 - 2331, 2005/08
Times Cited Count：53 Percentile：85.25(Physics, Multidisciplinary)no abstracts in English
-irradiation on latent tracks of polyethylene terephthalate (PET) filmHiroki, Akihiro; Asano, Masaharu; Yamaki, Tetsuya; Yoshida, Masaru
Chemical Physics Letters, 406(1-3), p.188 - 191, 2005/04
Times Cited Count：10 Percentile：33.01(Chemistry, Physical)The pre-treatment effect of -irradiation on latent tracks of polyethylene terephthalate (PET) films bombarded with swift heavy ions was investigated by electric conductometry and scanning electron microscopy (SEM) observation. The Xe-ion bombarded PET films were etched for 6 hours in 0.2 M NaOH aqueous solution at 70C to prepare track-etched membranes. As -irradiation doses increased in the range of 0-160 kGy, the pore diameter obtained by SEM observation decreased while that obtained by conductometry became large. This inconsistent result between the two methods was due to an increase in the crosslinked region in the latent tracks caused by -irradiation.
Kikuchi, Mitsuru; Suzuki, Takahiro; Sakamoto, Yoshiteru; Fujita, Takaaki; Naito, Osamu; JT-60 Team
Europhysics Conference Abstracts (CD-ROM), 29C, 4 Pages, 2005/00
Until 1995, it is experimentally confirmed that parallel transport of tokamak follows prediction of neoclassical theory (Kikuchi, Azumi, PPCF review). But it relies on gloval parameter. Since then, local measurement of bootstrap current density or electrical conductivity becomes possible by the development of new plasma diagnostics technique. In this paper, method of comparison of current profile evaluation and its application to electrical conductivity and bootstrap current density is reported.
FeS
(Ln=Ce,Pr,Nd,Sm) by magnetic susceptibility, specific heat, 
Fe m
ssbauer spectrum, and neutron diffraction measurementsWakeshima, Makoto*; Ino, Kentaro*; Hinatsu, Yukio*; Ishii, Yoshinobu
Bulletin of the Chemical Society of Japan, 76(8), p.1519 - 1525, 2003/08
Times Cited Count：2 Percentile：13.36(Chemistry, Multidisciplinary)no abstracts in English
Kuratomi, Takashi*; Yamaguchi, Kenji; Yamawaki, Michio*; Bak, T.*; Nowotny, J.*; Rekas, M.*; Sorrell, C. C.*
Solid State Ionics, 154-155, p.223 - 228, 2002/12
Times Cited Count：14 Percentile：57.58(Chemistry, Physical)no abstracts in English
Chen, J.; Hasegawa, Shin; Ohashi, Hitoshi; Maekawa, Yasunari; Yoshida, Masaru; Katakai, Ryoichi; Tsubokawa, Norio*
Macromolecular Rapid Communications, 23(2), p.141 - 144, 2002/01
Times Cited Count：9 Percentile：33.27(Polymer Science)no abstracts in English
-isopropylacrylamide)/potassium chloride gel electrolytesChen, J.; Maekawa, Yasunari; Yoshida, Masaru; Tsubokawa, Norio*
Journal of Polymer Science, Part B; Polymer Physics, 40, p.134 - 141, 2001/11
Times Cited Count：7 Percentile：27.52(Polymer Science)no abstracts in English
Apel, P. Y.*; Korchev, Y. E.*; Siwy, Z.*; Spohr, R.*; Yoshida, Masaru
Nuclear Instruments and Methods in Physics Research B, 184(3), p.337 - 346, 2001/11
Times Cited Count：475 Percentile：99.96(Instruments & Instrumentation)no abstracts in English
-isopropylacrylamide and calcium chlorideChen, J.; Yoshida, Masaru; Maekawa, Yasunari; Tsubokawa, Norio*
Polymer, 42(23), p.9361 - 9365, 2001/11
Times Cited Count：31 Percentile：72.25(Polymer Science)no abstracts in English
Peng, L.; Apel, P.*; Maekawa, Yasunari; Yoshida, Masaru
Nuclear Instruments and Methods in Physics Research B, 168(4), p.527 - 532, 2000/08
Times Cited Count：12 Percentile：62.16(Instruments & Instrumentation)no abstracts in English
Yoshida, Masaru; Asano, Masaharu; Omichi, Hideki; Spohr, R.*; Katakai, Ryoichi*
Radiat. Meas., 28(1-6), p.799 - 810, 1997/00
Times Cited Count：12 Percentile：67.93(Nuclear Science & Technology)no abstracts in English
Egusa, Shigenori; *
Proc. of the 5th Int. Conf. on Adaptive Structures, 0, p.324 - 333, 1995/00
no abstracts in English
-ray irradiation on in-situ electrical conductivity of ZrO-10mol% GdO
single crystal at elevated temperaturesKang, T.-K.*; Kuk, I.-H.*; Katano, Yoshio; Igawa, Naoki; Ono, Hideo
Journal of Nuclear Materials, 209(3), p.321 - 325, 1994/05
no abstracts in English
Kagaku Zensho, 48 Itan No Kagobutsu; Futeihisei Towa Nanika, 157 Pages, 1993/06
no abstracts in English
-GdO crystalsT.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：17 Percentile：67.99(Materials Science, Ceramics)no abstracts in English
