L12-NigAl Viewing along [001] To see the atom columns in periodical structure 6
L12 -Ni3Al 6 Viewing along [001] To see the atom columns in periodical structure
Ni-Al-Re 2nm Y 7 X.X.Yu et al.Journal of Alloys and Compounds 582(2014)299-304
7 X.X. Yu et al. / Journal of Alloys and Compounds 582 (2014) 299–304
Imaging atom columns/lattice planes Go to a zone axis orientation Low index zone axis is preferred ·eg.[110],[001]or[111]for fcc It is because of the resolution limit of the EMs. 8
Imaging atom columns/lattice planes • Go to a zone axis orientation • Low index zone axis is preferred • eg. [110], [001] or [111] for fcc • It is because of the resolution limit of the EMs. 8
Imaging using more than one beam ●透射波 ·衍射波 (a) (b) (c) Bright field Dark field HREM Amplitude contrast 9
Imaging using more than one beam 9 Bright field Dark field HREM Amplitude contrast