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Akita, Koichi; Nakatani, Hayato*; Ogihara, Shinji*; Shobu, Takahisa; Shiro, Ayumi*; Igawa, Naoki; Shimojo, Yutaka
SPring-8/SACLA Riyo Kenkyu Seikashu (Internet), 6(1), p.105 - 108, 2018/01
no abstracts in English
Yoshii, Kenji; Ikeda, Naoshi*; Shimojo, Yutaka; Ishii, Yoshinobu*
Materials Chemistry and Physics, 190, p.96 - 101, 2017/04
Times Cited Count:15 Percentile:48.9(Materials Science, Multidisciplinary)Magnetic and dielectric properties have been studied for LaCrO, PrCrO, and their solid solution LaPrCrO, belonging to a family of ferroelectricorthochromite series CrO (: rare earths). The magnetic measurements confirm that the material shows canted antiferromagnetic ordering at 240-288 K. Neutron diffraction patterns could be fitted with the centrosymmetric , which is different from the non-centrosymmetric structure proposed for the ferroelectric phase of NdCrO. The large dielectric constants are likely due to the hopping of charge carriers as proposed previously for other chromites.
Shimojo, Yutaka; Ihata, Yoshiaki; Kaneko, Koji; Takeda, Masayasu
JAEA-Testing 2012-005, 63 Pages, 2013/02
Taking an advantage of high penetration capability of neutron, neutron scattering experiments can be performed under various sample environment, such as low (high) temperature, pressure, magnetic field and stress, and those complex conditions. To this aim, a number of sample environment accessories, refrigerators, furnaces, pressure cells, superconducting magnets are equipped in JRR-3 to be used for experiments. In this document, all available equipment in both JRR-3 reactor hall and guide hall are summarized. We hope this document would help neutron scattering users to perform effective, and excellent experiments.
Yoshii, Kenji; Hiramitsu, Yusuke*; Okajima, Yuka*; Yoneda, Yasuhiro; Nishihata, Yasuo; Mizuki, Junichiro; Nakamura, Akio; Shimojo, Yutaka; Ishii, Yoshinobu*; Morii, Yukio; et al.
Materials Research Bulletin, 45(11), p.1574 - 1580, 2010/10
Times Cited Count:12 Percentile:37.35(Materials Science, Multidisciplinary)Magnetic and dielectric properties of perovskite manganites RSrMnO (R = Gd, Tb and Dy) have been investigated. DC and AC magnetic measurements showed short-range glassy magnetic ordering at Tg about 40 K. Such ordering was observed by neutron diffraction and is ascribable to the size mismatch of R and Sr settled randomly at the same crystallographic site. Dielectric constants for each material were about 1000-10000 between about 50 K and 300 K and showed broad maximums above Tg. Dielectric dispersion showed poor coherency of the motion of polar regions, plausibly because of the size-mismatch effect; both the magnetic and dielectric properties of this system are governed by the randomness at the R/Sr site. The tan and EXAFS data suggest that the dielectric response is rooted in a transfer of the Mn-3d electrons.
Mitamura, Hisayoshi; Naganawa, Hirochika; Nagano, Tetsushi; Yanase, Nobuyuki; Hanzawa, Yukiko; Shimojo, Kojiro; Matsubara, Tatsuo; Mita, Yutaka; Taki, Tomihiro; Murata, Masato
JAEA-Research 2008-113, 27 Pages, 2009/03
An effective mass processing equipment using solvent extraction method, named "emulsion flow extractor," is the most promising apparatus for removal and recovery of uranium from liquid waste originated from decontamination of uranium-contaminated fluoride waste in the uranium conversion test facility and of used gas centrifuges in the uranium enrichment facility at Ningyo-toge environmental engineering center. Prior to application of the emulsion flow extractor for actual uranium-containing liquid waste, properties of some phosphorous extractants for extraction and separation of uranium and constituents from simulated liquid wastes were examined through batch tests. These preliminary tests revealed that D2EHPA would be a promising candidate for extractant used for treatment of the actual uranium-containing liquid wastes, and that the extractants with a surfactant like AOT would not be useful.
Takeda, Masayasu; Nakamura, Mitsutaka; Shimojo, Yutaka; Kakurai, Kazuhisa
Nuclear Instruments and Methods in Physics Research A, 586(2), p.229 - 238, 2008/02
Times Cited Count:1 Percentile:13.82(Instruments & Instrumentation)The polarization analysis options on the thermal neutron triple-axis spectrometer TAS-1 at JRR-3 of Japan Atomic Energy Agency (JAEA) have been improved as a result of an upgrading program of the Advanced Science Research Center. In order to increase the polarized neutron intensity, we have replaced the previous flat polarizing CuMnAl (Heusler) monochromator and analyzer with doubly focusing ones. Intensity gain factors of more than 30 have been achieved for 14.7 meV neutrons in measurements of incoherent neutron scattering of vanadium. Using the new monochromator and analyzer, elastic and inelastic polarized neutron scattering experiments with the conventional setup for one-dimensional polarization analysis and with CRYOPAD (Cryogenic Polarization Analysis Device) for three-dimensional polarization analysis are now routinely performed on TAS-1.
Hiramitsu, Yusuke*; Yoshii, Kenji; Yoneda, Yasuhiro; Mizuki, Junichiro; Nakamura, Akio; Shimojo, Yutaka; Ishii, Yoshinobu*; Morii, Yukio; Ikeda, Naoshi*
Japanese Journal of Applied Physics, Part 1, 46(10B), p.7171 - 7174, 2007/10
Times Cited Count:15 Percentile:51.29(Physics, Applied)Magnetic and dielectric properties of a perivskite manganite TbCaMnO were investigated. Magnetic measurements showed three characteristic temperatures, originating from charge ordering (300 K), antiferromagnetic ordering (120 K) and a transition to a glassy state (50 K). The coexistence of the charge and antiferromagnetic ordering was consistent with the result of powder neutron diffraction. AC dielectric measurements showed large dielectric constants of about 5000 at around room temperature. A temperature dependence of the dielectric constant changed just below the charge-ordering temperature. From the analysis of tan;, the activation energy for a domain-boundary motion was calculated to be about 0.09 eV. These results strongly suggest that the dielectric properties of this material are governed by the ordering and transfer of the Mn-3d charges.
Yoshii, Kenji; Mizumaki, Masaichiro*; Kato, Kazuo*; Uruga, Tomoya*; Abe, Hideki*; Nakamura, Akio; Shimojo, Yutaka; Ishii, Yoshinobu; Morii, Yukio
Journal of Solid State Chemistry, 180(1), p.377 - 381, 2007/01
Times Cited Count:6 Percentile:23.92(Chemistry, Inorganic & Nuclear)no abstracts in English
Yoshii, Kenji; Nakamura, Akio; Mizumaki, Masaichiro*; Tanida, Hajime*; Kawamura, Naomi*; Abe, Hideki*; Ishii, Yoshinobu; Shimojo, Yutaka; Morii, Yukio
Journal of Magnetism and Magnetic Materials, 272-276(Suppl.), p.e609 - e611, 2004/05
Times Cited Count:4 Percentile:25.15(Materials Science, Multidisciplinary)no abstracts in English
Minakawa, Nobuaki; Morii, Yukio; Shimojo, Yutaka
Proceedings of 6th International Conference on Residual Stressess (ICRS-6), Vol.2, p.1107 - 1111, 2000/07
no abstracts in English
*; *; Hinatsu, Yukio*; Shimojo, Yutaka; Morii, Yukio
Journal of Solid State Chemistry, 145(2), p.705 - 710, 1999/00
Times Cited Count:27 Percentile:73.04(Chemistry, Inorganic & Nuclear)no abstracts in English
*; Tsuchiya, Yoshinori*; Funahashi, Satoru; *; Shimojo, Yutaka; *; *
J. Magn. Magn. Mater., 177-181, p.1425 - 1426, 1998/00
Times Cited Count:6 Percentile:36.77(Materials Science, Multidisciplinary)no abstracts in English
Tsuchiya, Yoshinori*; *; *; *; Shimojo, Yutaka; Morii, Yukio; *
J. Magn. Magn. Mater., 177-181, p.1447 - 1448, 1998/00
Times Cited Count:5 Percentile:32.48(Materials Science, Multidisciplinary)no abstracts in English
Hinatsu, Yukio*; Shimojo, Yutaka; Morii, Yukio
Journal of Alloys and Compounds, 270, p.127 - 131, 1998/00
Times Cited Count:9 Percentile:55.14(Chemistry, Physical)no abstracts in English
*; Hinatsu, Yukio*; Nakamura, Akio; Inami, Toshiya; Shimojo, Yutaka; Morii, Yukio
Journal of Solid State Chemistry, 141, p.404 - 410, 1998/00
Times Cited Count:86 Percentile:96.32(Chemistry, Inorganic & Nuclear)no abstracts in English
*; *; *; Watanabe, Mamoru*; *; Morii, Yukio; Shimojo, Yutaka
Solid State Ionics, 113-115, p.471 - 475, 1998/00
Times Cited Count:3 Percentile:22.14(Chemistry, Physical)no abstracts in English
Tsuchiya, Yoshinori*; *; *; *; Shimojo, Yutaka; Morii, Yukio; *
Physica B; Condensed Matter, 237-238, p.446 - 448, 1997/00
Times Cited Count:11 Percentile:58.52(Physics, Condensed Matter)no abstracts in English
*; *; *; Shimojo, Yutaka; Morii, Yukio
Solid State Ionics, 86-88(PT.1), p.227 - 230, 1996/00
no abstracts in English
*; *; Shimojo, Yutaka; Morii, Yukio; *
Journal of Alloys and Compounds, 231(1-2), p.755 - 759, 1995/00
Times Cited Count:14 Percentile:67.63(Chemistry, Physical)no abstracts in English
Tsuchiya, Yoshinori*; *; *; *; Shimojo, Yutaka; Morii, Yukio; *
Physica B; Condensed Matter, 213-214, p.366 - 368, 1995/00
Times Cited Count:0 Percentile:0.01(Physics, Condensed Matter)no abstracts in English