Phys. Rev. Lett. 78, 1074–1077 (1997)Diminished Medium-Range Order Observed in Annealed Amorphous GermaniumReceived 4 November 1996; published in the issue dated 10 February 1997 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. © 1997 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.78.1074
DOI:
10.1103/PhysRevLett.78.1074
PACS:
61.14.Rq, 61.16.Bg, 61.43.-j
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