کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1627760 1516458 2006 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Evaluation of thermal conductivity of hypostoichiometric (U, Pu)O2−x solid solution by molecular dynamics simulation at temperatures up to 2000 K
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Evaluation of thermal conductivity of hypostoichiometric (U, Pu)O2−x solid solution by molecular dynamics simulation at temperatures up to 2000 K
چکیده انگلیسی

The thermal conductivities of hypostoichiometric U1−yPuyO2−x solid solutions have been investigated by the molecular dynamics (MD) simulation between 300 and 2000 K using the Born–Mayer–Huggins interatomic potential with the partially ionic model. In the present equilibrium MD system, the thermal conductivity was calculated by the time-integral of auto-correlation function of energy current based on the Green–Kubo relationship. For stoichiometric U1−yPuyO2.0 crystals (y = 0.0–0.3), the thermal conductivity was almost constant as a function of Pu content y. On the other hand, for hypostoichiometric U0.8Pu0.2O2−x solid solutions (x = 0.0–0.06), the effect of oxygen deficiency x on the thermal conductivity became larger with increasing x, and their thermal conductivities were lower than that of the stoichiometric oxide, while the temperature dependence was weakened. These results were caused by that oxygen vacancies as lattice defects disordered phonon conduction, which was elucidated by the vibration analyses, i.e. the correlation function of energy current and the phonon-level density.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 415, Issues 1–2, 18 May 2006, Pages 43–50
نویسندگان
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