采用EPR谱和TEM对YSZ单晶辐照损伤的研究

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.200keV的Xe和400keV的Cs离子注入[111]取向的YSZ单晶中,注量均为5×10¹⁶cm^-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-sectional images of the irradiated samples show that the Cs-ion irradiation in YSZ produced more defect clusters than Xe-ion irradiation.

参考文献

[1] Ewing R C,Macfarlane A.Nuclear waste-Yucca Mountain[J].Science,2002,296(5568):659-660.

[2] Weber W J,Ewing R C.Plutonium immobilization and radiation effects[J].Science,2000,289 (5487):2051-2052.

[3] Ewing R C,Weber W J,Lian J.Nuclear waste disposal-pyrochlore (A₂B₂O₇):Nuclear waste form for the immobilization of plutonium and "minor" actinides[J].J Appl Phys,2004,95(11):5949-5971.

[4] 向霞,祖小涛,张传飞,等.单晶YSZ的Xe⁺ 离子辐照效应研究[J].强激光与粒子束,2003,15(4):405-408.
Xiang X,Zu X T,Zhang C F,et al.Study of Xe⁺-irradiation effect in yttria-stabilized zirconia single crystals.High Power Laser and Particle Beams,2003,15(4):405-408

[5] 向霞,祖小涛,吴继红,等.单晶YSZ的Xe⁺ 辐照损伤的电子显微分析[J].强激光与粒子束,2004,16(1)95-97.
Xiang X,Zu X T,Wu J H,et al.Electron microscopy study on irradiation damage of xenon-implanted yttria-stabilized zirconia single crystals[J].High Power Laser and Particle Beams,2004,16(1):95-97

[6] Sickafus K E,Matzke Hj,Hartmann T,et al.Radiation damage effects in zirconia[J].J Nucl Mater,1999,274:66-67.

[7] 祖小涛,张传飞,向霞,等.辐照诱发中间相Zr(Cr,Fe)₂非晶化的原位电子显微研究[J].强激光与粒子束,2003,15(4):694-696.
Zu X T,Zhang C F,Xiang X,et al.Ion-irradiation-induced amorphization of Zr(Cr,Fe)₂ precipitate.High Power Laser and Particle Beams,2003,15(4):694-696

[8] Wang L M,Wang S X,Zhu S,et al.Effects of fission product incorporation on the microstructure of cubic zirconia[J].J Nucl Mater,2001,289:122-127.

[9] Azzoni C B,Paleari A.Effect of Yttria concentration on the EPR signal in X-ray-irradiated Yttria-stabilized zirconia[J].Phys Rev B 1989,40:9333-9335.

[10] Zirgler J F.The Stopping and range of ions in matter IBM-research[M].NY:York Town,2000.

[11] Merino R I,Orera V M,Lomonva E E,et al.Paramagnetic electron traps in reduced stabilized zirconia[J].Phys Rev B 1995,52:6150-6153.

[12] Azzoni C B,Bolis L,Camagni P,et al.Defect model for the optical and EPR activity of the T-center in yttrium-stabilized zirconia[J].Radiation Effects and Defects in Solids,1995,134:485-488.

[13] Costantini J M,Beuneu F,Grynszpan R I,et al.Paramagnetic centers induced in cubic zirconia by 2.5 MeV electron and 2.6 GeV uranium ion irradiations[J].Nucl Instrum Meth B,2002,191:616-621.

[14] Orera V M,Merino R I,Chen Y,et al.Intrinsic electron and hole deffects in stabilized zirconia single-crystals[J].Phys Rev B 1990,42:9782.

[15] Wu S Y,Dong H N,Zu X T.Theoretical investigations of the g factors and the local structure for the trigonal Zr³⁺,center in X-ray irradiated YSZ[J].Journal of Alloys and Compounds,2005,388:168-171.

[16] Wertz J E,Bolton J R.Electron spin resonance elementary theory and practical applications[M].Chapman and Hall,1986.37-44.

祖小涛, 封向东, 雷雨, 朱莎, 王鲁闵. 采用EPR谱和TEM对YSZ单晶辐照损伤的研究[J]. 强激光与粒子束, 2005, 17(12): 1909. ZU Xiao-tao, FENG Xiang-dong, LEI Yu, ZHU Sha, WANG Lu-min. Study on irradiation damage of yttria-stabilized zirconia single crystals using ERP and TEM[J]. High Power Laser and Particle Beams, 2005, 17(12): 1909.

采用EPR谱和TEM对YSZ单晶辐照损伤的研究

关于本站 Cookie 的使用提示

全站搜索

采用EPR谱和TEM对YSZ单晶辐照损伤的研究

相关论文

相关资讯

关于本站 Cookie 的使用提示

全站搜索