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Effect of Sintering on Defects in Yttria Stabilised Zirconia

机译：烧结对氧化钇稳定氧化锆缺陷的影响

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摘要

A variable energy slow positron beam was utilised to investigate depth dependent effects of sintering on the tetragonal yttria stabilised zirconia nanopowders. Positron implantation was combined with the determination of Doppler broadened profiles of annihilation radiation. The results are consistent with recent positron lifetime data showing that sintering at elevated temperatures leads to a disappearance of pores and a significant grain growth, which is demonstrated by a strong suppression of positronium formation and a substantial decrease in concentration of open volume defects at triple points, respectively, with increasing sintering temperature. An existence of a subsurface layer of a relatively high content of defects was shown in sintered samples and tentatively attributed to arise from a diffusion of open volume defects from the sample interior toward the surface or from a sintering-induced surface modification.
机译：利用可变能量慢正电子束来研究烧结对四方氧化钇稳定的氧化锆纳米粉体的深度依赖性影响。正电子注入与确定多普勒展宽的ni灭辐射谱相结合。结果与最近的正电子寿命数据一致，后者显示在高温下烧结会导致孔隙消失和明显的晶粒长大，这可以通过强烈抑制正电子形成和在三点上大幅减少开口体积缺陷浓度来证明随着烧结温度的升高。在烧结样品中显示出存在含量相对较高的次表面层，并暂时归因于开放体积缺陷从样品内部向表面的扩散或烧结引起的表面改性。

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  • 来源
  • 会议地点 Smolenice Castle(SK)
  • 作者

    Ivan Prochazka; Jakub Cizek; Oksana Melikhova; Wolfgang Anwand; Gerhard Brauer; Tetyana E. Konstantinova; Igor A. Danilenko;

  • 作者单位

    Charles University in Prague, Faculty of Mathematics and Physics, Department of Low Temperature Physics, V Holesovickach 2, CZ-180 00 Praha 8, Czech Republic;

    Charles University in Prague, Faculty of Mathematics and Physics, Department of Low Temperature Physics, V Holesovickach 2, CZ-180 00 Praha 8, Czech Republic;

    Charles University in Prague, Faculty of Mathematics and Physics, Department of Low Temperature Physics, V Holesovickach 2, CZ-180 00 Praha 8, Czech Republic;

    Helmholtz-Zentrum Dresden-Rossendorf, Institute of Radiation Physics, POB 51 01 19, D-01314 Dresden, Germany;

    Helmholtz-Zentrum Dresden-Rossendorf, Institute of Radiation Physics, POB 51 01 19, D-01314 Dresden, Germany;

    National Academy of Sciences of Ukraine, Galkin Donetsk Institute for Physics and Engineering, Luxemburg Street 72, 83114 Donetsk, Ukraine;

    National Academy of Sciences of Ukraine, Galkin Donetsk Institute for Physics and Engineering, Luxemburg Street 72, 83114 Donetsk, Ukraine;

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  • 正文语种 eng
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  • 关键词

    Yttria stabilised zirconia; sintered nanopowders; slow positron implantation spectroscopy;

    机译：氧化钇稳定的氧化锆；烧结纳米粉；慢正电子注入光谱;

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