Analysis of cathodoluminescence from indented MgO crystals subjected to thermal environments

Using colour cathodoluminescence, spectral analysis and cathodoluminescence mapping in scanning electron microscopy, some peculiarities of cathodoluminescence from the indentation centre and the rosette on MgO (100) crystals were investigated over a wide temperature range 80–1000 K. The sensitivity of indentation-induced defects to thermal environments has been revealed. An attempt has been made to explain the spatial distribution of cathodoluminescence from around indentations in terms of dislocation internal friction in solids.