Sunday, December 31, 2006

Picture of the day

lanthanum aluminate Paul A. Midgley

This is a false colour convergent beam electron diffraction pattern recorded at 150kV parallel to the three-fold axis of lanthanum aluminate. In addition to the mesh of reflections at the centre, the pattern also shows concentric circles of reflections in successive higher order Laue zones. Odd numbered zones have only a single branch of intensity that corresponds to scattering solely from the oxygen atoms in the structure.

As with the previous picture, I will post the others in this series over time. To see it all now, visit the Nanotechnology Now Gallery.

Acknowledgements: Paul A. Midgley, University of Cambridge - Department of Materials Science and Metallurgy

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