Lattice parameters from direct-space images at two tilts
Abstract
Lattices in three dimensions are oft studied from the ``reciprocal space'' perspective of diffraction. Today, the full lattice of a crystal can often be inferred from direct-space information about three sets of non-parallel lattice planes. Such data can come from electron-phase or Z contrast images taken at two tilts, provided that one image shows two non-parallel lattice periodicities, and the other shows a periodicity not coplanar with the first two. We outline here protocols for measuring the 3D parameters of cubic lattice types in this way. For randomly-oriented nanocrystals with cell side greater than twice the continuous transfer limit, orthogonal +/-15 deg and +/-10 deg tilt ranges might allow one to measure 3D parameters of all such lattice types in a specimen from only two well-chosen images. The strategy is illustrated by measuring the lattice parameters of a 10 nm WC_{1-x} crystal in a plasma-enhanced chemical-vapor deposited thin film.
Cite
@article{arxiv.cond-mat/0001139,
title = {Lattice parameters from direct-space images at two tilts},
author = {W. Qin and P. Fraundorf},
journal= {arXiv preprint arXiv:cond-mat/0001139},
year = {2007}
}
Comments
14 pages, 7 figs, 3 tables, 25 refs, RevTeX4, notes http://www.umsl.edu/~fraundor/help/imagnxtl.htm