I have HRTEM image of a monoclinic structure, how can I know the crystallographic direction for a particular plane? Also, I don't have zone axis HRTEM images. Kindly help
if you have information about lattice parameter, calculate possible interplanar distances for your structure. Then make a measure of frequency maxima represented by dots on FFT pattern and compare with your calculations. If you find some matches you can determine the position of lattice planes in reciprocal space. Having so, crystallographic direction in monoclinic structure is perpendicular to lattice plane.