Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
)O
( = Th, Np) prepared by supercritical hydrothermal synthesisShirasaki, Kenji*; Tabata, Chihiro*; Sunaga, Ayaki*; Sakai, Hironori; Li, D.*; Konaka, Mariko*; Yamamura, Tomoo*
Journal of Nuclear Materials, 563, p.153608_1 - 153608_11, 2022/05
Times Cited Count：2 Percentile：53.91(Materials Science, Multidisciplinary)We focused on the direct synthesis of (U, )O solid solution (=Th, Np) by extending our recent progress in hydrothermal synthesis with additives. The homogeneity of the (U, )O ( = Th, Np) systems prepared by supercritical hydrothermal reactions was investigated through crystallographic analysis based on Vegard's law, and the 
Na nuclear magnetic resonance (NMR) measurement of (U, Np, Na)O solid solutions. Our experimental and analytical results revealed that (i) an optimal additive is ammonium carbonate and starting uranium valence is IV in the case of (U, Th)O
, and (ii) an optimal additive is ethanol and starting uranium valence is VI in the case of (U, Np)O, for producing the homogeneous solid solutions by hydrothermal synthesis.
Ln
O
(Ln = Gd, Er) solid solutionPham, V. M.*; Arima, Tatsumi*; Inagaki, Yaohiro*; Idemitsu, Kazuya*; Akiyama, Daisuke*; Nagai, Takayuki; Okamoto, Yoshihiro
Journal of Nuclear Materials, 556, p.153189_1 - 153189_9, 2021/12
Times Cited Count：1 Percentile：16.35(Materials Science, Multidisciplinary)The crystal structure change was evaluated for (1-x)UO
-xLnO
(Ln=Gd or Er; x = 0 to 0.4) samples sintered at 1973 K for 8 h under Ar and Ar-10%H atmospheres. The effect of LnO doping on the crystal structure of UO was investigated by X-ray diffraction (XRD) and X-ray absorption fine structure (XAFS). LnO doping into UO reduced the lattice parameter of UO-LnO solid solutions up to 40mol% LnO. The lattice parameters of these samples were comparable to those of stoichiometric (U,Ln)O
solid solutions, that is, the O/M ratios were close to 2.00. The U L
-edge XANES analysis showed that higher U oxidation states of +5 or +6 formed, in addition to + 4. The EXAFS analysis indicated that the interatomic distances of U-O and Gd-O decreased with increasing x, whereas those of Er-O may not decrease monotonically.
Yamashita, Toshiyuki; Yamazaki, Satoshi*; Sato, Tsuyoshi*; Matsui, Tsuneo*
Journal of Nuclear Science and Technology, 39(Suppl.3), p.656 - 659, 2002/11
no abstracts in English
Eu-M
ssbauer spectroscopic study of the Hf
Eu
O(
)(0
x1.0) systemHarada, Daijitsu*; Hinatsu, Yukio*; Masaki, Nobuyuki; Nakamura, Akio
Journal of the American Ceramic Society, 85(3), p.647 - 652, 2002/03
no abstracts in English
Yamanaka, Shinsuke*; Uno, Masayoshi*; Kurosaki, Ken*; ; Namekawa, Takashi
JNC TY9400 2000-011, 41 Pages, 2000/03
JNC-TY9400-2000-011.pdf:1.28MB
no abstracts in English
Uwaba, Tomoyuki; Mizuta, Shunji;
JNC TN9400 2000-028, 41 Pages, 2000/03
JNC-TN9400-2000-028.pdf:2.52MB
14Cr-25Ni optimized advanced austenic steels have been developed to improve the swelling resistance of 15Cr-20Ni austenic stainless steels used for FBR fuel cladding. ln this improvement, Ti,Nb,V and P were dissolved into 14Cr-25Ni marix by means of the high-temperature solution treatment to make finely distributed and stabilized precipitates in the operation. Furthermore, at the final stage of cold-working, cold-working level increased and residual stress was reduced. ln this study, as fablicated microstructure observation, solubility of alloying elements and grain size test in the manufacturing process were evaluated. Following results were obtained. (1)Spherical precipitates were observed in the grain. Most of them were identified as conjugated carbo-nitride [Ti,Nb(C,N)] by EDX analysis. (2)The dissolved percentages of Ti and Ni in the matrix were about 70% and 30% respectively. Undissoved Ti and Nb may react with undissolved carbon and precipitate as MC carbides. (3)High-temperature solution treatment is effective for the sufficient solubility of alloying elements, but it is likely to induce very large grains, which is the cause of defective signal in the ultrasonic alloy testing. The results of the grain size test showed that the large grain size is reduced in low Nb (0.1wt%) alloy compared with the standard alloy (0.2wt%Nb), and the effectiveness for the grain size control by reducing the Nb content was confirmed. Also, it was suggested that the intermediate heat treatment and cold work conditions would possibly avoid the occurrence of the large grain at the final heat treatment.
Eu-Mssbauer spectroscopic study of the fluorite-type oxide solid solutions, EuMO
(M=Zr,Ce)(0y1.0)Masaki, Nobuyuki; Guillermo, N. R. D.; Otobe, Haruyoshi; Nakamura, Akio; Izumiyama, Yuki*; Hinatsu, Yukio*
Advances in Science and Technology, 29, p.1233 - 1240, 2000/00
no abstracts in English
Arai, Yasuo; Nakajima, Kunihisa; Suzuki, Yasufumi
Journal of Alloys and Compounds, 271-273, p.602 - 605, 1998/00
Times Cited Count：16 Percentile：68.02(Chemistry, Physical)no abstracts in English
*; Murakami, Takashi*; Kogure, Toshihiro*; Isobe, Hiroshi; Sato, Tsutomu
Mat. Res. Soc. Symp. Proc., 506, p.839 - 846, 1998/00
no abstracts in English
GdO by solid state EMF measurementsNakamura, Akio
Zeitschrift f
r Physikalische Chemie, 207, p.223 - 243, 1998/00
no abstracts in English
Yamashita, Toshiyuki; Shirasu, Noriko; Tsuji, Toshihide*; Kato, Tetsuya*
Journal of Nuclear Materials, 247, p.90 - 93, 1997/00
Times Cited Count：51 Percentile：94.73(Materials Science, Multidisciplinary)no abstracts in English
Arai, Yasuo; Nakajima, Kunihisa;
Proc. of 4th Int. Information Exchange Meeting on Actinide and Fission Product Partitioning and Transm, 0, p.347 - 357, 1997/00
no abstracts in English
Arai, Yasuo; Iwai, Takashi; Nakajima, Kunihisa; Suzuki, Yasufumi
Proc. of Int. Conf. on Future Nuclear Systems (Global'97), 1, p.664 - 669, 1997/00
no abstracts in English
Konishi, Satoshi; Nagasaki, Takanori; Hayashi, Takumi; Okuno, Kenji
Journal of Nuclear Materials, 223, p.300 - 304, 1995/00
Times Cited Count：22 Percentile：87.04(Materials Science, Multidisciplinary)no abstracts in English
Konishi, Satoshi; Nagasaki, Takanori; Hayashi, Takumi; Okuno, Kenji
Fusion Technology, 26(3), p.668 - 672, 1994/11
no abstracts in English
Sato, Tsutomu
SMECTITE, 4(1), p.48 - 51, 1994/05
no abstracts in English
Hinatsu, Yukio
Nihon Genshiryoku Gakkai-Shi, 36(8), p.714 - 726, 1994/00
Times Cited Count：1 Percentile：17.88(Nuclear Science & Technology)no abstracts in English
