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Segawa, Tomoomi; Kawaguchi, Koichi; Ishii, Katsunori; Suzuki, Masahiro; Fukasawa, Tomonori*; Fukui, Kunihiro*
Funtai Kogakkai-Shi, 57(9), p.485 - 494, 2020/09
In the spent fuel reprocessing process, a mixed solution of uranyl nitrate and plutonium nitrate is converted into mixed oxide powder by the microwave heating. To evaluate the applicability to the industrial-scale and acquire the characteristics data of the microwave heating denitration of various metal nitrate aqueous solutions based on the knowledge studied in the development of laboratory-scale basic experiments, the microwave heating characteristics and metal oxide powder properties were investigated using cerium nitrate, cobalt nitrate and copper nitrate aqueous solutions. The progress rate of the denitration reaction was depended on the position, and the denitration reaction proceeded faster at the periphery than at the center. The morphologies of the synthesized products were porous and hard dry solid with cerium nitrate aqueous solution, foamed dry solid with cobalt nitrate aqueous solution, and powdery particles with copper nitrate aqueous solution. The denitration ratio and average particle size of the synthesized products increased in the order of the cerium nitrate aqueous solution, the cobalt nitrate aqueous solution, and the copper nitrate aqueous solution. The numerical simulations revealed that the periphery of the bottom surface of the metal nitrate aqueous solution was heated by microwaves. This results consistent with the experimental results in which the denitration reaction started from the periphery of the metal nitrate aqueous solution.
Segawa, Tomoomi
Funtai Kogakkai-Shi, 55(10), P. 547, 2018/10
no abstracts in English
Ca
Ir
O
Sakai, Hironori; Ono, Hiroyuki*; Oba, Noriaki*; Kato, Masaki*; Yoshimura, Kazuyoshi*
Physica B; Condensed Matter, 329-333(2), p.1038 - 1039, 2003/05
Times Cited Count：4 Percentile：26.88(Physics, Condensed Matter)Pyrochlore iridium oxides PbCaIrO (
=0.0, 0.2, 0.4, 0.6, 0.8) were prepared by solid state reaction. The electrical resistivity and the magnetic susceptibility were measured between 4.2 and 300 K. These compounds show metallic conductivity and obey the Curie-Weiss law with temperature independent term. The metallic conductivity of PbIrO
is suppressed by the Ca substitution for Pb site.
Azuma, Masaki*; Saito, Takashi*; Ishiwata, Shintaro*; Yoshida, Hirofumi*; Takano, Mikio*; Kosaka, Yuki*; Takagi, Hidenori*; Utsumi, Wataru
Journal of Physics; Condensed Matter, 14(44), p.11321 - 11324, 2002/11
Times Cited Count：11 Percentile：50.63(Physics, Condensed Matter)no abstracts in English
Yasuoka, Hiroshi
Journal of the Physical Society of Japan, 69(suppl.B), p.161 - 172, 2000/00
no abstracts in English
*; Nagasaki, Shinya*; *; Tanaka, Satoru*; Suzuki, Atsuyuki*; Tanaka, Tadao; Muraoka, Susumu
Radiochimica Acta, 82, p.239 - 242, 1998/00
no abstracts in English
; Miyata, Teijiro
Nihon Genshiryoku Gakkai-Shi, 38(12), p.992 - 1000, 1996/00
Times Cited Count：1 Percentile：14.44(Nuclear Science & Technology)no abstracts in English
Yoshida, Hiroshi; *; Odawara, Osamu*; Terai, Takayuki*
JAERI-M 92-217, 54 Pages, 1993/02
no abstracts in English
JAERI-M 92-017, 33 Pages, 1992/03
no abstracts in English
Nakajima, Kenji; Kajimoto, Ryoichi; Yamada, Kazuyoshi*; Horigane, Kazumasa*
no journal, ,
Carrier doping into transition metal oxides triggers various phenomena, which have been subjected to intensive investigations. Layered oxide LaMO
(M: 3d metal) is one of the model systems for such studies. In cobalates, contribution of orbital moment and possible spin state of Co
give further complexity. In La
Sr
CoO, charges order in checker-board style and Co
spin correlations are modulated in momentum space by the ordered charges. (1) Magnetic excitations in this system are reported to be accounted for spin-waves of Co spins taking into account the orbital moment. (2) In this study, we have investigated magnetic excitations in another almost half-doped system LaCoO
by inelastic neutron scattering. Clear spin-wave excitations consistent to previous report on LaSrCoO were observed. However, we also observed an additional excitations with different zone center positions as well as excitation with higher spin-wave velocity. We expect detail analysis of present results can provide a key clue to understand the mechanism of complicated magnetic excitations caused by doped carrier, spin-orbital coupling and spins in transition metal oxides.
NiONakajima, Kenji; Kajimoto, Ryoichi
no journal, ,
no abstracts in English
Hayashi, Yusaku*; Ueda, Mitsutoshi*; Kawamura, Kenichi*; Irisawa, Eriko; Komatsu, Atsushi; Kato, Chiaki; Okubo, Nariaki
no journal, ,
It is necessary to form a protective oxide film on the surface in order to protect stainless steel from corrosion by liquid LBE at high temperatures. A resistance change type sensor using the reduction/oxidation phenomenon of metal oxides was devised for the oxygen concentration in liquid LBE decreases and the protective oxide film disappears from the stainless steel surface. In this paper, the principle of operation of the sensor was experimentally confirmed and its response was evaluated.
