Thermal conductivity measurement of (Pu1-xAmx)O2 (x = 0.028, 0.072)

Taku Matsumoto, Tatsumi Arima, Yaohiro Inagaki, Kazuya Idemitsu, Masato Kato, Kyoichi Morimoto, Masahiro Ogasawara

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Abstract

The thermal diffusivity of (Pu,Am)O2 was measured by the laser flash method in the temperature range from 750 K to 1450 K, and the thermal conductivity was estimated from the measured thermal diffusivity, the bulk density and the heat capacity obtained from the Kopp-Neumann rule. In the measurements up to 1250 K, the O/M ratio of the specimens was kept almost constant at 2, and it could be concluded that the thermal conductivity of stoichiometric (Pu,Am)O2 with a small Am content was insensitive to Am content. However, the O/M ratio of the specimen with 7.2 mol% Am content might be reduced at high temperatures, and it might lead to a small decrease in thermal conductivity. These Am content dependences of thermal conductivity were well explained by the phonon scattering model for thermal resistivity.

Original languageEnglish
Pages (from-to)92-97
Number of pages6
JournalJournal of Alloys and Compounds
Volume629
DOIs
Publication statusPublished - Apr 25 2015

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All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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