Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
through irreversible biogenic manganese oxide sequestrationTani, Yukinori*; Kakinuma, Satomi*; Chang, J.*; Tanaka, Kazuya; Miyata, Naoyuki*
Minerals (Internet), 11(1), p.53_1 - 53_14, 2021/01
Times Cited Count：4 Percentile：45.1(Geochemistry & Geophysics)In this study, we examined the Ba sequestration potential of enzymatically active biogenic Mn oxides (BMOs) with and without exogenous Mn. The BMOs readily oxidized exogenous Mn to produce another BMO phase, and subsequently sequestered Ba at a pH of 7.0, with irreversible Ba sequestration as the dominant pathway. Extended X-ray absorption fine structure spectroscopy and X-ray diffraction analyses demonstrated alteration from turbostratic to tightly stacked birnessite through possible Ba incorporation into the interlayer.
O
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：19 Percentile：65.6(Materials Science, Multidisciplinary)Uniaxial ferroelectric BaTiO with a Curie temperature 
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
octahedral units is frozen in the ferroelectric phase and the space group changes from nonpolar 
to polar 
.
-ray spectrometry; Application of 
pre-concentration from large volume of water sample using Powdex resin and barium sulfate coprecipitation of radium isotopesTomita, Jumpei; Abe, Takuya
JAEA-Research 2016-026, 12 Pages, 2017/03
JAEA-Research-2016-026.pdf:1.15MB
An analytical method of low-level Ra isotopes in freshwater samples with combination of pre-concentration from large volume of water sample (
170 L) using Powdex resin and -ray spectrometry followed by simple coprecipitation of Ra was developed. 
pre-concentration of Ra by batch method using Powder resin was examined, and it was shown that the amount of the resin required collecting Ra in the water sample could be determined by measuring the electric conductivity (EC) of water sample. It was found that coprecipitation of Ra with barium sulfate could remove more than 96% of potassium that increases the background. The validation of this method was confirmed by the analyses of 170 L of water sample containing the known amount of Ra isotopes with different EC. Among the analyses, the recovery of Ra was 98% in average and detection limits of 
Ra and 
Ra were achieved to be approximately 0.3 and 0.5 mBq L
, respectively.
Tai, R.; Namikawa, Kazumichi; Sawada, Akikatsu*; Kishimoto, Maki; Tanaka, Momoko; Lu, P.*; Nagashima, Keisuke; Maruyama, Hiroshi*; Ando, Masami*
Physical Review Letters, 93(8), p.087601_1 - 087601_4, 2004/08
Times Cited Count：76 Percentile：89.47(Physics, Multidisciplinary)The polarization clusters existing in both the ferroelectric and the paraelectric phase of BaTiO are directly observed and characterized for the first time by a picosecond soft X-ray laser speckle technique. These dynamic clusters appear continuously across the Curie temperature Tc. The clusters' distance increases approximately linearly with temperature, while their mean size does not change significantly. The polarization exhibits a maximum at a temperature about 5 degree above Tc. The clusters' short-range correlation strength diverges as (T-Tc)
0.41
0.02 as temperature decreases toward Tc.
Nagashima, Keisuke; Tanaka, Momoko; Nishikino, Masaharu; Kishimoto, Maki; Kado, Masataka; Kawachi, Tetsuya; Hasegawa, Noboru; Ochi, Yoshihiro; Sukegawa, Kota*; Tai, R.; et al.
Applied Physics B, 78(7), p.927 - 932, 2004/05
We have succeeded in developing a laser-pumped X-ray laser with full spatial coherence at 13.9 nm. A highly directed X-ray laser beam with the divergence of 0.2 mrad was generated from the double target experiment, where a seeding light from the first laser medium was amplified in the second medium. The observed divergence is close to the diffraction limit value within a factor of two. The seeding light was amplified in the second medium without refraction influence and the gain coefficient was about 8 cm-1. From the measurement of visibility, it was found that the spatial coherent length is longer than the beam diameter. As an application of this coherent X-ray laser, we observed a surface microstructure of ferroelectric material, BaTiO and clarified a change of the microstructure near the Curie temperature.
crystalYoneda, Yasuhiro; Komura, Yoshiki*; Suzuki, Yoshio*; Hamazaki, Shinichi*; Takashige, Masaaki*
Journal of the Physical Society of Japan, 73(4), p.1050 - 1053, 2004/04
We have observed 90 
C domain walls in a bulk BaTiO crystal by Synchrotron radiation topography, coupled with a CCD detector. The BaTiO multi-domain crystal was revealed to be strained at the 90 C domain boundary. The polar direction of the BaTiO crystal was tilted by this starin, and this strain also causes the irregular angle of the surface bending mode. The Synchrotron X-ray topography can be performed on a sample with electrodes. The topographic image of the ferroelectric doamin with an electric field clarified that the well-known stripe domain configuration can not be observed without a weak electric field due to the lattice strain at the doamin boundary.
thin filmsYoneda, Yasuhiro; Sakaue, Kiyoshi*; Terauchi, Hikaru*
Journal of Physics; Condensed Matter, 13(42), p.9575 - 9582, 2001/10
Times Cited Count：19 Percentile：68.12(Physics, Condensed Matter)no abstracts in English
thin-film capacitorYoneda, Yasuhiro; Sakaue, Kiyoshi*; Terauchi, Hikaru*
Japanese Journal of Applied Physics, Part 1, 39(8), p.4839 - 4842, 2000/08
Times Cited Count：16 Percentile：57.57(Physics, Applied)no abstracts in English
Tei, Kazuyoku; Matsuoka, Fumiaki*; Kato, Masaaki; Maruyama, Yoichiro; Arisawa, Takashi
Optics Letters, 25(7), p.481 - 483, 2000/04
Times Cited Count：14 Percentile：57.19(Optics)no abstracts in English
thin films grown by molecular beam epitaxyYoneda, Yasuhiro*; *; Sakaue, Kiyoshi*; Terauchi, Hikaru*; *; *
Journal of Applied Physics, 83(5), p.2458 - 2461, 1998/03
Times Cited Count：97 Percentile：94.4(Physics, Applied)no abstracts in English
thin filmsYoneda, Yasuhiro*; *; Sakaue, Kiyoshi*; Terauchi, Hikaru*
Journal of the Korean Physical Society, 32, p.S1393 - S1396, 1998/02
no abstracts in English
and BaUO in atmospheres simulating accident conditionsHuang, J.*; Yamawaki, Michio*; Yamaguchi, Kenji*; Yasumoto, Masaru*; Sakurai, Hiroshi*; Suzuki, Yasufumi
Journal of Nuclear Materials, 248, p.257 - 261, 1997/09
no abstracts in English
Kitazawa, Shinichi; Sataka, Masao
Atomic Collision Research in Japan,No. 22, 0, p.115 - 116, 1996/00
no abstracts in English
Kitazawa, Shinichi
JAERI-Tech 95-042, 27 Pages, 1995/09
no abstracts in English
; Nakajima, Kunihisa; Iwai, Takashi; Omichi, Toshihiko; *
JAERI-Research 95-027, 19 Pages, 1995/03
JAERI-Research-95-027.pdf:0.89MB
no abstracts in English
Hinatsu, Yukio
Journal of Solid State Chemistry, 102, p.566 - 569, 1993/00
Times Cited Count：24 Percentile：70.48(Chemistry, Inorganic & Nuclear)no abstracts in English
Maebara, Sunao; Tsuneoka, Masaki; Yokokura, Kenji; Honda, Masao; Sawahata, Masayuki; Sakamoto, Keishi; Seki, Masami; Ikeda, Yoshitaka; Miyake, Setsuo*
Plasma Devices and Operations, 1(2), p.141 - 154, 1991/10
no abstracts in English
; Motoishi, Shoji
Proc. of the 3rd Asian Symp. on Research Reactor, 8 Pages, 1991/00
no abstracts in English
; ;
Radiochimica Acta, 39, p.179 - 183, 1986/00
no abstracts in English
