PED patterns were recorded on JEOL JEM 2100 LaB6 operated
at 200 kV accelerating voltage. The sample preparation was the
same as in for HRTEM imaging.
EDS was used for investigation of chemical compositions
of the sample. EDS studies were performed on a Tescan Mira1
microscope. This microscope had auto emission electron gun
operated at 15 keV. Scanning electron microscopy (SEM)
studies were performed also on this microscope at 30 keV in