Abstract
We have studied the changes in microstructure and elastic modulus of single crystal MgAl 2O 4 irradiated with 12 MeV Au 3+ at about 100 K to a fluence of 1.5 × 10 16 ions/cm 2. High-resolution electron microscopy and electron diffraction from cross-sectional samples indicate that the irradiated layer remains crystalline even after a peak damage dose of about 33 displacements per atom (dpa). In addition, dark-field electron microscopy reveals that the irradiated layer contains small defect clusters which indicate a high point defect mobility. Young's modulus determined by nano-indentation does not show any significant changes. These results, which are in contrast to the amorphization and 30% decrease in Young's modulus previously observed following 400 keV Xe 2+ irradiation at 100 K, are interpreted in terms of the large electronic to nuclear stopping power ratio of the 12 MeV Au 3+ irradiation and the possibility of beam heating during irradiation.
Published Version
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