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Science 2 June 2006:
Vol. 312. no. 5778, p. 1354
DOI: 10.1126/science.1124511
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Direct Determination of Local Lattice Polarity in Crystals

K. A. Mkhoyan,1* P. E. Batson,2 J. Cha,1 W. J. Schaff,1 J. Silcox1

With current advances in sub-angstrom resolution scanning transmission electron microscopy (STEM), it is now possible to image directly local crystal structures of materials where dramatically different atoms are separated from each other at distances about or less than 1 angstrom. We achieved direct imaging of atomic columns of nitrogen in close proximity to columns of aluminum in wurtzite aluminum nitride by using annular dark field imaging in an aberration-corrected STEM. This ability allows direct determination of the local polarity in nanoscale crystals and crystal defects.

1 School of Applied and Engineering Physics, Cornell University, Ithaca, NY 14853, USA.
2 IBM Thomas J. Watson Research Center, Yorktown Heights, NY 10598, USA.

* To whom correspondence should be addressed. E-mail: kam55{at}cornell.edu

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