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Published online by Cambridge University Press: 17 March 2011
200 keV iodine and 400 keV strontium ions have been implanted into YSZ inorder to study the effects of fission product incorporation in YSZ as aninert fuel matrix. The ion implantation was conducted at room temperature.The ion fluences reached 1×1021 ions/m2 which givespeak displacement damage levels of ~ 290 dpa for I ion implantation and ~200 dpa for Sr ion implantation. The peak concentration reaches ~26 at. %for implanted I ions and ~11.6 at.% for Sr ions. Cross-sectionaltransmission electron microscopy (TEM) was completed to investigate themicrostructure changes caused by the implantation. No evidence ofamorphization was detected in both samples although a high density of defectclusters was observed by TEM. Cross-sectional TEM revealed formation ofiodine containing voids in I- implanted samples and crystalline precipitatesof a few tens of nanometers in Sr-implanted samples after annealing of theimplanted sample at 1000°C for 0.5 to 2 hours. The void size increased withincreasing annealing time. The nano-crystalline precipitates in Sr-implantedYSZ are isometric SrZrO3 (a≅0.41 nm). Theorientation relation between the matrix and precipitates, as determined byselected area diffraction pattern, was: [011]YSZ// [111]SrZrO3and [200]YSZ// [110]SrZrO3.