In situ microstructure observations have been carried out for crystals of an MgO-Al2O3 system under concurrent irradiation with ions and electrons in a TEM-accelerator facility to gain insights into their concurrent irradiation effects. MgO·Al2O3, MgO·2.4Al2O3 and α-Al2O3 were irradiated concurrently with 300 keV O+ and 200 keV electrons or solely with 300 keV O+ at 870 K. Retardation of dislocation loop nucleation was observed in MgO·Al2O3, and MgO·2.4Al2O3 crystals under the concurrent irradiation, though no significant changes were observed in the microstructure of α-Al2O3 between regions irradiated concurrently with ions and electrons, and irradiated solely with ions. Further, the concurrent irradiation has been found to enhance the growth of dislocation loops in MgO·Al2O3 and MgO·2.4Al2O3 at the periphery of a focused electron beam. The different response in the concurrent irradiation effects among the crystals of MgO-Al2O3 system are discussed in terms of the nucleation rate of dislocation loops under 300 keV O+ irradiation and the stability of loops under electron irradiation, which depend on electron energy and irradiation temperature.
|Number of pages||8|
|Journal||Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms|
|Publication status||Published - 2000 May 2|
|Event||10th International Conference on Radiation Effects in Insulators - Jena, Ger|
Duration: 1999 Jul 18 → 1999 Jul 23
ASJC Scopus subject areas
- Nuclear and High Energy Physics