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首页> 外文期刊>Physical review >Thermal properties of Cd_2Re_2O_7 and Cd_2Nb_2O_7 at the structural phase transitions
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Thermal properties of Cd_2Re_2O_7 and Cd_2Nb_2O_7 at the structural phase transitions

机译：Cd_2Re_2O_7和Cd_2Nb_2O_7在结构相变处的热学性质

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摘要

The structural phase transitions in Cd_2Re_2O_7 and Cd_2Nb-2O_7 pyrochlores have been studied through capaci-tive thermal expansion, heat capacity, and thermal conductivity. The superconductor Cd_2Re_2O_7 (T_c= 1 K) shows well-defined anomalies at 200 and 120 K due to structural transitions. The pressure dependence of the transition temperatures is calculated from the thermal expansion and heat capacity, which shows good agreement with the results of direct measurements. The ferroelectric Cd_2Nb_2O_7 shows distinct anomalies due to structural transitions at 204, 85, and 46 K, in addition to a broad feature around 190 K associated with the relaxorlike behavior. For both compounds, the lattice thermal conductivity shows a glasslike temperature dependence in the high-temperature cubic phase.
机译：通过电容热膨胀，热容和热导率研究了Cd_2Re_2O_7和Cd_2Nb-2O_7烧绿石中的结构相变。由于结构转变，超导体Cd_2Re_2O_7（T_c = 1 K）在200和120 K处显示了明确定义的异常。从热膨胀和热容计算出转变温度的压力依赖性，这与直接测量的结果显示出很好的一致性。铁电Cd_2Nb_2O_7表现出明显的异常，这是由于在204、85和46 K处发生了结构转变，此外还有与弛豫样行为相关的190 K附近的宽幅特征。对于这两种化合物，晶格热导率在高温立方相中都表现出类似玻璃的温度依赖性。

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  • 来源
    《Physical review》 |2010年第5期|P.054108.1-054108.7|共7页
  • 作者

    Makoto Tachibana; Naoya Taira; rnHitoshi Kawaji; rnEiji Takayama-Muromachi;

  • 作者单位

    National Institute for Materials Science, Namiki 1-1, Tsukuba, lbaraki 305-0044, Japan;

    Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan;

    rnMaterials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan;

    rnNational Institute for Materials Science, Namiki 1-1, Tsukuba, lbaraki 305-0044, Japan;

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  • 正文语种 eng
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  • 关键词

    superconducting materials; thermal properties of crystalline solids;

    机译：超导材料;结晶固体的热性质;

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