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Title:
Thermal expansions of NpO 2 and some other actinide dioxides
Authors:
Yamashita, Toshiyuki; Nitani, Noriko; Tsuji, Toshihide; Inagaki, Hirornitsu
Affiliation:
AA(Department of Chemistry and Fuel Research, Nuclear Fuel Chemistry Laboratory, Japan Atomic Energy Research Institute, Tokai-mura,Ibaraki 319-11, Japan), AB(Department of Chemistry and Fuel Research, Nuclear Fuel Chemistry Laboratory, Japan Atomic Energy Research Institute, Tokai-mura,Ibaraki 319-11, Japan), AC(Department of Nuclear Engineering, Faculty of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-01, Japan), AD(Department of Nuclear Engineering, Faculty of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-01, Japan)
Publication:
Journal of Nuclear Materials, Volume 245, Issue 1, p. 72-78.
Publication Date:
05/1997
Origin:
ELSEVIER
Abstract Copyright:
(c) 1997 Elsevier Science B.V.
DOI:
10.1016/S0022-3115(96)00750-7
Bibliographic Code:
1997JNuM..245...72Y

Abstract

Thermal expansions of the stoichiometric actinide dioxides (ThO 2, UO 2, NpO 2 and PuO 2) were investigated between room temperature and 1300 K using a high temperature X-ray diffraction method. The lattice parameter of NpO 2 at high temperatures was expressed as αT (pm) = 542.03 + 4.28 × 10 -3T + 9.07 × 10 -7T2 - 1.36 × 10 -10T3. Based on excellent reproducible data, thermal expansion of NpO 2 was determined. Thermal expansions of the other actinide dioxides showed good agreement with the respective recommended literature values. The linear thermal expansion coefficients ( α) of actinide dioxides calculated at 1200 K were in inverse relation to their melting points. At room temperature, however, the α value of UO 2 was found to be higher than those of the other actinide dioxides and this result was discussed.
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