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Journal Articles

Experimental verification to developing safety technology for liquefied hydrogen in the project "STACY"

Tanaka, Hirohisa*; Matsumura, Daiju; 10 of others*

International Journal of Hydrogen Energy, 141, p.1088 - 1097, 2025/06

https://doi.org/10.1016/j.ijhydene.2025.01.284
 Times Cited Count：1 Percentile：39.31(Chemistry, Physical)

Journal Articles

Liquid phase sintering of alumina-silica co-doped cerium dioxide CeO$$_{2}$$ ceramics

Vauchy, R.; Hirooka, Shun; Watanabe, Masashi; Yokoyama, Keisuke; Sunaoshi, Takeo*; Yamada, Tadahisa*; Nakamichi, Shinya; Murakami, Tatsutoshi

Ceramics International, 49(2), p.3058 - 3065, 2023/01

https://doi.org/10.1016/j.ceramint.2022.09.295
 Times Cited Count：13 Percentile：53.23(Materials Science, Ceramics)

Journal Articles

Crystal structure and electron density distribution analyses of Nd$$_{x}$$Ce$$_{1-x}$$O$$_{2-delta}$$ for electrolyte by Rietveld/ maximum entropy method

Taguchi, Tomitsugu; Igawa, Naoki; Birumachi, Atsushi; Asaoka, Hidehito; Miwa, Shuhei; Osaka, Masahiko

e-Journal of Surface Science and Nanotechnology (Internet), 13, p.339 - 342, 2015/06

https://doi.org/10.1380/ejssnt.2015.339

Rare-earth doped ceria exhibits both ionic and electronic conductions, and those ceria with higher ratio of ionic conduction against electronic conduction is used as a solid electrolyte for solid oxide fuel cells. The electron density distributions in crystals are closely related to the electron diffusing pathway which affects the electronic conduction. In this study, we investigated the electron density distribution of doped ceria as a function of the content of Nd$$_{2}$$O$$_{3}$$-dopant to deduce the ratio of the electronic to ionic conduction. The crystal structure was refined with the space group, ${it Fm}$-3${it m}$, which is the same as undoped ceria. Ce and Nd ions randomly occupied the 4${it a}$ site and O ion the 8${it c}$ site. The electron conduction pathway was distributed through the 4${it a}$-8${it c}$ and 8${it c}$-8${it c}$ sites. The relationship between crystal structural change and electron density distribution as a function of the content of Nd$$_{2}$$O$$_{3}$$ dopant will be discussed.

Journal Articles

Oxygen potential measurements of pyrochlore-type Zr$$_{2}$$M$$_{2}$$O$$_{7+x}$$7(M=Pu, Ce) by EMF method

Otobe, Haruyoshi; Nakamura, Akio; Yamashita, Toshiyuki; Ogawa, Toru

Journal of Nuclear Science and Technology, 39(Suppl.3), p.652 - 655, 2002/11

http://www.tandfonline.com/doi/abs/10.1080/00223131.2002.10875553

Pyrochlore-type (P-type) zirconia has been widely studied as a disposable form of the high-level radioactive nuclear waste. We have developed the EMF (electromotive force) measurement system using the cubic zirconia sensor, in order to investigate the oxygen potential ($$Delta$$g(O$$_{2}$$)) of P-type Zr$$_{2}$$Pu(Ce)$$_{2}$$O$$_{7+x}$$. For P-type Zr$$_{2}$$Ce$$_{2}$$O$$_{7+x}$$ at 1078 K, we have found that $$Delta$$g(O$$_{2}$$) vs. oxygen composition (x) relationship has different behavior between x more than 0.34 and x less than 0.34. This may suggest that the degree and way of the ordering of oxide ions (O$$^{2-}$$) and oxygen vacancies (V0) should change around x =0.34. We have also measured the $$Delta$$g(O$$_{2}$$) vs. temperature (T) relationship between 763 and 1078 K at various x, and derived the partial molar enthalpy (h(O$$_{2}$$)) and entropy (s(O$$_{2}$$)) of oxygen. It was found that h(O$$_{2}$$) and s(O$$_{2}$$) of P-type Zr$$_{2}$$Ce$$_{2}$$O$$_{7+x}$$ exhibit significantly different behavior from those of fluorite-type CeO$$_{2-x}$$. The similar experiments are in progress for P-type Zr$$_{2}$$Pu$$_{2}$$O$$_{7+x}$$, and the results are discussed in comparison with those of P-type Zr$$_{2}$$Ce$$_{2}$$O$$_{7+x}$$ mentioned above.

JAEA Reports

Energy transfer and thermal conductivity through inert matrix and nuclear fuel analogous materials

C.Degueldre*; Takano, Masahide; Omichi, Toshihiko; Fukuda, Kosaku; P.Heimgartner*; T.Graber*

JAERI-Research 97-087, 19 Pages, 1997/11

JAERI-Research-97-087.pdf:0.87MB

no abstracts in English

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