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Yamashita, Toshiyuki; *; Tsuji, Toshihide*; Kato, Tetsuya*; *; Iwashita, Mitsushige*
Journal of Alloys and Compounds, 271-273, p.400 - 403, 1998/00
Times Cited Count：4 Percentile：39.22(Chemistry, Physical)no abstracts in English
Terai, Takayuki*
PNC TJ9602 97-002, 75 Pages, 1997/03
Nuclear materials are often utilized under severe conditions such as high temperature, thermal transient, irradiation, corrosion by liquid metal, particle implantation, electric field and magnetic field, and an investigation on the behavior of the materials is strongly required. However, the property change is so complicated by cooperative effects of these conditions that there have been few studies on it. This project aims to clarify degradation mechanism of ceramics under the complex conditions and to contribute to the development of new advanced ceramics and surface modification. For such purposes, (1)to clarify the change in microstructure, composition and crystal structure of ceramics, (2)to analyze the distribution and condition of radiation defects and implanted ions, (3)to measure physical properties such as electric conductivity and (4)to investigate chemical and mechanical property change due to corrosion are to be carried out. In FY 1996, compatibility of several kinds of ceramic coating materials with liquid metals such as molten lithium and lithium-lead alloy (Li17-Pb83) and electrical resistivity change of these materials in the presence of the liquid metals were investigated. As a result, most of the results were in good agreement with a thermodynamic prediction and most of the compounds maintained their high electrical resistivity even in the presence of liquid lithium and lithium-lead alloy. In addition, it was pointed out that in case of Y
O
, a complex compound (LiYO) and a non-stoichiometric compound (YO
) were formed, which was out of the thermodynamic prediction.
Tsuji, Toshihide*; *; Yamashita, Toshiyuki; Fujino, Takeo*
Journal of Alloys and Compounds, 213-214, p.378 - 380, 1994/00
Times Cited Count：1 Percentile：25.3(Chemistry, Physical)no abstracts in English
at low oxygen partial pressuresFujino, Takeo*; Yamashita, Toshiyuki; Ouchi, Kinji; *; Tsuji, Toshihide*
Journal of Nuclear Materials, 202, p.154 - 162, 1993/00
Times Cited Count：11 Percentile：72.08(Materials Science, Multidisciplinary)no abstracts in English
Sato, Haruo; Ashida, Takashi; Kohara, Yukitoshi*; Yui, Mikazu; Umeki, Hiroyuki; Ishiguro, Katsuhiko
PNC TN8410 92-164, 31 Pages, 1992/09
None
Aoyama, S.*; Ishii, T.*; Horita, M.*; Adachi, T.*; Horie, Y.*; Hokari, T.*
PNC TJ1060 92-001, 240 Pages, 1992/03
None
Takaki, Seiya; Takano, Masahide
no journal, ,
Nitride fuel with ZrN matrix have been studied for transmutation of minor actinide (MA). These are supposed to be designed as ZrN solid solution or TiN compounds with MA nitride from 20 mol% to 40 mol%. From the above, composition and temperature dependence of thermal conductivity for safety evaluation of the fuel have been studied with a little of MA. In future, it is important to understand the heat conduction mechanism in detail when evaluating irradiation effect on thermal conductivity. In the present study, we are aimed to clarify composition and temperature dependence of thermal conductivity of Dy
Zr
N solid solution as surrogate nitride fuel with MA in order to understand the dependence of the MA nitride fuel physically.
Watanabe, Masashi; Kato, Masato
no journal, ,
The point defect concentrations of the non-stoichiometric oxide are closely related to properties including oxygen potential, oxugen diffusion and electrical conductivity. In this study, the oxygen potential of PuO was evaluated with Brouwer diagram and the formation energies of point defect were determined by ab-initio calculation and Brouwer diagram. The relationship among oxygen potential, oxygen diffusion and electrical conductivity were described as function of O/M ratio and temperature.
Takaki, Seiya; Takano, Masahide
no journal, ,
Nitride fuel with ZrN matrix have been studied for transmutation of minor actinide (MA). Although composition and temperature dependence of thermal conductivity for safety evaluation of the fuel have been studied with a little of MA, there is little information about physical explanation of thermal conduction for MA nitride fuel. In the present study, we are aimed to clarify composition and temperature dependence of thermal conductivity of DyZrN solid solution as surrogate nitride fuel with MA in order to understand the dependence of the MA nitride fuel physically. We found thermal conductivity by using laser flash methods and electrical contribution of thermal conductivity by measuring electrical conductivity, which revealed that electrical conductivity is responsible for thermal conductivity.
