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Stability of amorphous Ta-O nanotubes prepared by anodization: Thermal and structural analyses

机译：阳极氧化制备的非晶态Ta-O纳米管的稳定性：热和结构分析

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摘要

Amorphous Ta-O nanotubes (NTs) prepared by anodization in a sulfuric-acid-based solution have been found to contain considerable amounts of extra oxygen and sulfur. Their structural and thermal stability has been studied by combining x-ray diffractometry, transmission electron microscopy, and thermal analysis. The amorphous Ta-O, whose composition was estimated to be Ta_O_(6.6)S_(0.7), crystallizes into orthorhombic β-Ta_2O_5 at temperatures around 1073 K by an endothermic reaction, at which excess oxygen and impurity sulfur are released. The amorphous NTs were found to be thermally more stable than stoichiometric amorphous Ta_2O_5, whose crystallization temperature is around 973 K. Excess oxygen and impurity sulfur, which form chemical bonds with Ta atoms in the amorphous solid, must be the origin of the stability. The crystallization follows the out-diffusion of oxygen and sulfur from the solid at temperatures where the mobility of atoms is high enough, indicating that the crystallization is kinetically arrested.
机译：已经发现通过在基于硫酸的溶液中进行阳极氧化而制备的非晶态的Ta-O纳米管（NTs）含有大量的额外氧气和硫。通过结合X射线衍射，透射电子显微镜和热分析研究了它们的结构和热稳定性。通过吸热反应，在约1073 K的温度下，非晶Ta-O的组成估计为Ta_O_（6.6）S_（0.7）结晶为正交晶体β-Ta_2O_5，该过程中释放出过量的氧气和杂质硫。发现非晶态NTs比化学计量的非晶态Ta_2O_5热稳定，后者的结晶温度约为973K。过量的氧和杂质硫与非晶态固体中的Ta原子形成化学键，必须成为稳定性的来源。在原子迁移率足够高的温度下，结晶发生在氧气和硫从固体中向外扩散之后，这表明结晶在动力学上被阻止了。

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  • 来源
    《Journal of Materials Research》 |2014年第6期|753-760|共8页
  • 作者

    Ryusuke Nakamura; Kohta Asano; Manabu Ishimaru; Kazuhisa Sato; Masahide Takahashi; Hiroshi Numakura;

  • 作者单位

    Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University, Naka-ku, Sakai 599-8531, Japan;

    National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8565, Japan;

    Department of Materials Science and Engineering, Kyushu Institute of Technology, Tobata, Kitakyushu, Fukuoka 804-8550, Japan;

    Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan;

    Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University, Sakai 599-8531, Japan;

    Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University, Sakai 599-8531, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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