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首页> 外文期刊>Journal of Materials Research >Structural Modifications Of Gd_2zr_(2-x)ti_xo_7 Pyrochlore Induced By Swift Heavy Ions: Disordering And Amorphization
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Structural Modifications Of Gd_2zr_(2-x)ti_xo_7 Pyrochlore Induced By Swift Heavy Ions: Disordering And Amorphization

机译：快速重离子诱导的Gd_2zr_（2-x）ti_xo_7烧绿石的结构修饰：无序和非晶化

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摘要

The isometric, pyrochlore structure type, A_2B_2O_7, exhibits a wide variety of properties that find application in a large number of different technologies, from electrolytes in solid oxide fuel cells to actinide-bearing compositions that can be used as nuclear waste forms or inert matrix nuclear fuels. Swift xenon ions (1.43 GeV) have been used to systematically modify different compositions in the Gd_2Zr_(2-x)Ti_xO_7 binary at the nanoscale by radiation-induced phase transitions that include the crystalline-to-amorphous and order-disorder structural transformations. Synchrotron x-ray diffraction, Raman spectroscopy, and transmission electron microscopy provide a complete and consistent description of structural changes induced by the swift heavy ions and demonstrate that the response of pyrochlore depends strongly on chemical composition. The high and dense electronic energy deposition primarily results in amorphization of Ti-rich pyrochlore; whereas the formation of the fully disordered, defect-fluorite structure is the dominant process for Zr-rich pyrochlore.
机译：等距，烧绿石结构类型A_2B_2O_7具有广泛的特性，可用于多种不同的技术，从固体氧化物燃料电池中的电解质到可用作核废料形式或惰性基质核的含act系元素的组合物燃料。快速氙离子（1.43 GeV）已用于通过辐射诱导的相变（包括晶体到非晶和有序无序的结构转变）在纳米级系统地修饰Gd_2Zr_（2-x）Ti_xO_7二元体系中的不同组成。同步加速器X射线衍射，拉曼光谱和透射电子显微镜为快速重离子诱导的结构变化提供了完整一致的描述，并证明了烧绿石的响应在很大程度上取决于化学成分。高且致密的电子能量沉积主要导致富钛烧绿石的非晶化。而完全无序，缺陷萤石结构的形成是富Zr烧绿石的主要过程。

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  • 来源
    《Journal of Materials Research》 |2009年第4期|1322-1334|共13页
  • 作者

    M. Lang; F.X. Zhang; R.C. Ewing; Jie Lian; Christina Trautmann; Zhongwu Wang;

  • 作者单位

    Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109-1005;

    rnand Department of Materials Science & Engineering, University of Michigan,rnAnn Arbor, Michigan 48109-1005;

  • 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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