Diminished Medium-Range Order Observed in Annealed Amorphous Germanium
- 10 February 1997
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 78 (6) , 1074-1077
- https://doi.org/10.1103/physrevlett.78.1074
Abstract
We use variable coherence transmission electron microscopy to examine medium-range ordering in vacuum-deposited amorphous germanium. The method accesses higher-order atomic correlations through statistical analysis of hollow-cone dark-field image speckle. This yields greater sensitivity to medium-range order than the familiar pair correlation function obtained from diffraction. We find that thermal annealing of amorphous germanium reduces the degree of medium-range order, affirming the thermodynamic stability of the random network.Keywords
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