采用EPR谱和TEM对YSZ单晶辐照损伤的研究
Study on irradiation damage of yttria-stabilized zirconia single crystals using EPR and TEM
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摘要: 利用电子顺磁共振(EPR)谱和透射电子显微镜(TEM)研究了YSZ单晶的辐照效应。200 keV的Xe和400 keV的Cs离子注入［111］取向的YSZ单晶中，注量均为5×1016 cm-2。EPR结果表明辐照产生了共振吸收位置g‖=1.989 和 g⊥=1.869、对称轴为［111］的六配位Zr3+顺磁缺陷。Cs辐照产生了比Xe 离子辐照多约150倍的六配位Zr3+顺磁缺陷。两种样品的剖面电子显微分析表明没有发现非晶化转变，但是Cs离子辐照的样品在损伤集中区域产生了密度较高的缺陷。因此，EPR谱和电子显微观察均说明在相同离位损伤(约160 dpa)的情况下，Cs离子辐照比Xe 离子辐照产生了更多的缺陷。造成这一现象的原因是Cs离子是化学活性的而Xe 离子却是惰性的。Abstract: Electron paramagnetic resonance(EPR) and cross-sectional transmission electron microscopy were used to study defect structure and radiated damage mechanism. Single crystal samples of cubic zirconia stabilized by 9.5 mol.% Y2O3 (YSZ) were implanted with 200 keV Xe ions and 400 keV Cs ions up to a dose of 5×1016 cm-2, respectively. EPR spectra show the trigonal signal with g‖=1.989 and g⊥=1.869, which exhibites axial symmetry with ［111］ direction as symmetry axis composed of sixfold-coordinated Zr3+ sites. Peak-to-peak intensity (per unit volume) of Cs-ion irradiated YSZ is as about 150 time as that of Xe-ion irradiated YSZ, which indicates that the concentration of sixfold-coordinated Zr3+ defects produced by Cs-ion irradiation is far more than that of Xe-ion irradiated. The cross-sect
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Key words:
- ysz single crystal /
- ion irradiation /
- irradiation defects /
- electron paramagnetic resonance /
- tem
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