Thermal Expansion and Thermal Conductivity of Cesium Uranates

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Two kinds of cesium uranates, which are often predicted by thermochemical calculations to be formed in irradiated oxide fuels with high oxygen potentials, were prepared from U<SUB>3</SUB>O<SUB>8</SUB> and Cs<SUB>2</SUB>CO<SUB>3</SUB> to determine the thermal expansions and the thermal conductivities. The lattice parameters of tetragonal Cs<SUB>2</SUB>UO<SUB>4</SUB> and monoclinic Cs<SUB>2</SUB>U<SUB>2</SUB>O<SUB>7</SUB> were measured by the high-temperature X-ray diffraction method as a function of temperature. The linear thermal expansions of Cs<SUB>2</SUB>UO<SUB>4</SUB> and Cs<SUB>2</SUB>U<SUB>2</SUB>O<SUB>7</SUB> obtained from the temperature dependencies of the lattice parameters were 1.2% and 1.1% from room temperature to 973 and 1, 073K, respectively. The thermal diffusivities of Cs<SUB>2</SUB>UO<SUB>4</SUB> and Cs<SUB>2</SUB>U<SUB>2</SUB>O<SUB>7</SUB> were measured on the disk-shaped samples by the laser flash method as a function of temperature. The thermal conductivities were evaluated from the measured thermal diffusivities and the bulk densities, and the specific heat capacity available in literature. The thermal conductivity of Cs<SUB>2</SUB>UO<SUB>4</SUB> corrected for 100%TD was 1.2W/m•K at 980K and that of Cs<SUB>2</SUB>U<SUB>2</SUB>O<SUB>7</SUB> was 0.94W/m•K at 1, 093K, which are about 30% and 27% of that of UO<SUB>2</SUB>, respectively.

収録刊行物

  • Journal of nuclear science and technology  

    Journal of nuclear science and technology 35(7), 485-493, 1998-07-25 

    Atomic Energy Society of Japan

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各種コード

  • NII論文ID(NAID)
    10002079704
  • NII書誌ID(NCID)
    AA00703720
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    00223131
  • NDL 記事登録ID
    4525685
  • NDL 雑誌分類
    ZM35(科学技術--物理学)
  • NDL 請求記号
    Z53-A460
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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