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Loop formation by ion irradiation in yttria stabilized zirconia |
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| Authors: | T. Hojo H. Yamamoto J. Aihara S. Furuno K. Sawa T. Sakuma K. Hojou |
| Affiliation: | aDepartment of Science and Engineering, Ibaraki University, Mito-shi, Ibaraki 310-8512, Japan bJapan Atomic Energy Agency, Tokai-mura, Ibaraki 319-1195, Japan cResearch Organization for Information Science and Technology, Tokai-mura, Ibaraki 319-1106, Japan |
| Abstract: | Yttria stabilized zirconia (YSZ) is a candidate material focused as optical and insulating materials in nuclear reactors. Therefore, it is useful to investigate defect formation during irradiation, in order to assess YSZ resistance to radiation damage. In the present study, in situ transmission electron microscopy (TEM) observations were performed on YSZ during 30 keV Ne+ ion irradiation in the temperature range of 723–1123 K (using 100 K intervals). Results revealed that damage evolution morphology depends on irradiation temperature. For irradiations below 1023 K, defect clusters and bubbles were formed simultaneously. On the other hand, at 1123 K, only bubbles were formed in the initial stage of irradiation. Loops formed later following the bubble formation. It was also observed that, in the early stage of irradiation above 923 K, larger bubbles were formed along the loop planes compared with other areas. TEM observations indicated that dislocation loops formed on three kinds of crystallographic planes: namely, {1 0 0}, {1 1 1} and {1 1 2} planes. |
| Keywords: | Ion radiation effects Transmission electron microscopy Electron microscopy Direct observation of dislocations and other defects Physical radiation effects Radiation damage |
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