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Journal Articles

$$^{151}$$Eu-M$"o$ssbauer spectroscopic and X-ray diffraction study of the Eu$$_{2}$$(Ce$$_{1-x}$$Zr$$_{x}$$)$$_{2}$$O$$_{7}$$ and LnEuZr$$_{2}$$O$$_{7}$$(Ln=lanthanide) systems

Masaki, Nobuyuki; Nakamura, Akio; Furuuchi, Fumihito*; Hinatsu, Yukio*

Journal of Physics and Chemistry of Solids, 66(2-4), p.312 - 317, 2005/02

https://doi.org/10.1016/j.jpcs.2004.07.017
 Times Cited Count：10 Percentile：42.72(Chemistry, Multidisciplinary)

no abstracts in English

Journal Articles

Phase relations between a fluorite and a pyrochlore structure in the system of actinides and zirconium oxides

Yamashita, Toshiyuki; Kuramoto, Kenichi; Nakada, Masami; Yamazaki, Satoshi*; Sato, Tsuyoshi*; Matsui, Tsuneo*

Journal of Nuclear Science and Technology, 39(Suppl.3), p.585 - 591, 2002/11

http://www.tandfonline.com/doi/abs/10.1080/00223131.2002.10875536

no abstracts in English

Journal Articles

$$^{151}$$Eu M$"o$ssbauer spectroscopic study on the Eu$$_{y}$$M$$_{1-y}$$O$$_{2-y}$$(0$$leq$$y$$leq$$1.0)(M=Th, U)

Masaki, Nobuyuki; Otobe, Haruyoshi; Nakamura, Akio; Harada, Daijitsu*; Ito, Kentaro*; Sasaki, Yoshinobu*; Hinatsu, Yukio*

Journal of Nuclear Science and Technology, 39(Suppl.3), p.217 - 220, 2002/11

http://www.tandfonline.com/doi/abs/10.1080/00223131.2002.10875448

no abstracts in English

Journal Articles

Phase relation and thermodynamic properties of cubic fluorite-type solid solution, Ba$$_{y/2}$$Y$$_{y/2}$$U$$_{1-y}$$O$$_{2+x}$$(x$$>$$0,x=0,x$$<$$0)

Fujino, Takeo*; Yamashita, Toshiyuki; Ouchi, Kinji

Journal of Nuclear Materials, 183, p.46 - 56, 1991/00

https://doi.org/10.1016/0022-3115(91)90469-N
 Times Cited Count：9 Percentile：69.44(Materials Science, Multidisciplinary)

no abstracts in English

Oral presentation

Measurement of specific heat on fluorite compounds

Hirooka, Shun; Matsumoto, Taku; Kato, Masato; Tsuchimochi, Ryota; Ogasawara, Masahiro*

no journal, , 

Fluorite compounds such as actinide oxide and CaF$$_{2}$$ perform a rapid increase and a peak in the specific heat which are attributed by Bredig transition. The behavior is important as a nuclear fuel; however, the fact that the behavior occurs above 2000$$^{circ}$$C makes the experiment difficult, and the reported data are scattered. In this work, measurement of specific heat was carried out on CaF$$_{2}$$, SrF$$_{2}$$ and (Ca,Sr)F$$_{2}$$ for the relatively lower melting temperature of below 1500$$^{circ}$$C. (Ca,Sr)F$$_{2}$$ which has lower melting temperature than CaF$$_{2}$$ and SrF$$_{2}$$ showed the rapid increase of specific heat and the peak at lower temperature. It is expected that UO$$_{2}$$, PuO$$_{2}$$ and MOX that the high temperature data is limited and scattered could show the similar relationship between the specific heat and the melting temperature. Therefore, the results of the measurements on the fluorite compounds suggest the possibility that the Kopp's law is not applicable to the solid solution of fluoride materials at high temperature.

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