Ion Tracks and Nanohillocks Created in Natural Zirconia Irradiated with Swift Heavy Ions
Natural monoclinic zirconia (baddeleyite) was irradiated with 340 MeV Au ions, and the irradiation-induced nanostructures (i.e., ion tracks and nanohillocks) were observed using transmission electron microscopy. The diameter of the nanohillocks was approximately 10 nm, which was similar to the maxim...
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2024-01-01
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| author | Norito Ishikawa Shoma Fukuda Toru Nakajima Hiroaki Ogawa Yuki Fujimura Tomitsugu Taguchi |
| author_facet | Norito Ishikawa Shoma Fukuda Toru Nakajima Hiroaki Ogawa Yuki Fujimura Tomitsugu Taguchi |
| author_sort | Norito Ishikawa |
| collection | DOAJ |
| description | Natural monoclinic zirconia (baddeleyite) was irradiated with 340 MeV Au ions, and the irradiation-induced nanostructures (i.e., ion tracks and nanohillocks) were observed using transmission electron microscopy. The diameter of the nanohillocks was approximately 10 nm, which was similar to the maximum molten region size calculated using the analytical thermal spike model. Ion tracks were imaged as strained regions that maintained their crystalline structure. The cross-sections of most of the ion tracks were imaged as rectangular contrasts as large as 10 nm. These results strongly indicated that the molten region was recrystallized anisotropically, reflecting the lattice structure. Furthermore, low-density track cores were formed in the center of the ion tracks. The formation of low-density track cores can be attributed to the ejection of molten matter toward the surface. A comparison of the ion tracks in the synthetic zirconia nanoparticles and those in larger natural zirconia samples showed that the interface between the strained track contrast and the matrix was less clear in the former than in the latter. These findings suggest that the recrystallization process was affected by the size of the irradiated samples. |
| first_indexed | 2024-03-08T03:53:29Z |
| format | Article |
| id | doaj.art-3598b6a4a46f4bbd8c06203dc7126211 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-08T03:53:29Z |
| publishDate | 2024-01-01 |
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| spelling | doaj.art-3598b6a4a46f4bbd8c06203dc71262112024-02-09T15:17:02ZengMDPI AGMaterials1996-19442024-01-0117354710.3390/ma17030547Ion Tracks and Nanohillocks Created in Natural Zirconia Irradiated with Swift Heavy IonsNorito Ishikawa0Shoma Fukuda1Toru Nakajima2Hiroaki Ogawa3Yuki Fujimura4Tomitsugu Taguchi5Nuclear Science and Engineering Center, Japan Atomic Energy Agency (JAEA), Tokai 319-1195, Ibaraki, JapanTono Geoscience Center, Japan Atomic Energy Agency (JAEA), Toki 509-5102, Gifu, JapanTono Geoscience Center, Japan Atomic Energy Agency (JAEA), Toki 509-5102, Gifu, JapanNuclear Science and Engineering Center, Japan Atomic Energy Agency (JAEA), Tokai 319-1195, Ibaraki, JapanNuclear Science and Engineering Center, Japan Atomic Energy Agency (JAEA), Tokai 319-1195, Ibaraki, JapanFoundational Quantum Technology Research Directorate, National Institutes for Quantum Science and Technology (QST), Takasaki 370-1292, Gunma, JapanNatural monoclinic zirconia (baddeleyite) was irradiated with 340 MeV Au ions, and the irradiation-induced nanostructures (i.e., ion tracks and nanohillocks) were observed using transmission electron microscopy. The diameter of the nanohillocks was approximately 10 nm, which was similar to the maximum molten region size calculated using the analytical thermal spike model. Ion tracks were imaged as strained regions that maintained their crystalline structure. The cross-sections of most of the ion tracks were imaged as rectangular contrasts as large as 10 nm. These results strongly indicated that the molten region was recrystallized anisotropically, reflecting the lattice structure. Furthermore, low-density track cores were formed in the center of the ion tracks. The formation of low-density track cores can be attributed to the ejection of molten matter toward the surface. A comparison of the ion tracks in the synthetic zirconia nanoparticles and those in larger natural zirconia samples showed that the interface between the strained track contrast and the matrix was less clear in the former than in the latter. These findings suggest that the recrystallization process was affected by the size of the irradiated samples.https://www.mdpi.com/1996-1944/17/3/547swift heavy ionhillocksion tracksion irradiationTEM |
| spellingShingle | Norito Ishikawa Shoma Fukuda Toru Nakajima Hiroaki Ogawa Yuki Fujimura Tomitsugu Taguchi Ion Tracks and Nanohillocks Created in Natural Zirconia Irradiated with Swift Heavy Ions Materials swift heavy ion hillocks ion tracks ion irradiation TEM |
| title | Ion Tracks and Nanohillocks Created in Natural Zirconia Irradiated with Swift Heavy Ions |
| title_full | Ion Tracks and Nanohillocks Created in Natural Zirconia Irradiated with Swift Heavy Ions |
| title_fullStr | Ion Tracks and Nanohillocks Created in Natural Zirconia Irradiated with Swift Heavy Ions |
| title_full_unstemmed | Ion Tracks and Nanohillocks Created in Natural Zirconia Irradiated with Swift Heavy Ions |
| title_short | Ion Tracks and Nanohillocks Created in Natural Zirconia Irradiated with Swift Heavy Ions |
| title_sort | ion tracks and nanohillocks created in natural zirconia irradiated with swift heavy ions |
| topic | swift heavy ion hillocks ion tracks ion irradiation TEM |
| url | https://www.mdpi.com/1996-1944/17/3/547 |
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