Radiation effects in corundum structure derivatives

J. N. Mitchell, R. Devanathan, N. Yu, K. E. Sickafus, C. J. Wetteland, V. Gopalan, M. A. Nastasi, K. J. McClellan

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


The radiation response of α-Al2O3 (R3̄c), FeTiO3 (R3̄), MgTiO3 (R3̄), and LiTaO3 (R3c) was investigated using 200 keV Ar2+ and 1 MeV Kr+ and a combination of Rutherford backscattering spectrometry and transmission electron microscopy. All of these materials have the corundum or a corundum-derivative crystal structure. This family of oxides is of interest due to the simple but significant differences in the structure of the cation sublattices in the different space groups. These materials are also of interest because of their range of melting temperatures, the range of melting temperatures of their oxide components, differences in bonding characteristics, and the complete solid solution between Fe-TiO3 and MgTiO3. Our results show that α-Al2O3 and MgTiO3 are consistently more radiation tolerant than FeTiO3 and that LiTaO3 amorphizes substantially easier than the other three oxides. The greater stability of MgTiO3 than Fe-TiO3 appears to be analogous to the response of Mg-Fe silicates to ion irradiation and high pressure. A characteristic consistent with the radiation tolerance trend of the four oxides studied is a decreasing melting temperature of the component oxides. Thus, the lower stability of Fe-O octahedra in FeTiO3 and Li-O octahedra in LiTaO3 may adversely affect the radiation tolerance of these oxides.

Original languageEnglish (US)
Pages (from-to)461-466
Number of pages6
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Issue number1-4
StatePublished - May 1998

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Instrumentation


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