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Cr(11) texture induced by epitaxy on Al(sub2)O(sub3) (0001) substrates: Preferential grain growth in the direction

Published

Author(s)

Zoe A. Boekelheide, F Hellman

Abstract

Chromium exhibits (110) textured growth on Al2O3(0001) (C-plane) substrates induced by epitaxy. The epitaxy occurs in nine distinct orientations due to two different orientation relationships, leading to a polycrystalline film with grains with different in-plane orientations but the same (110) out-of-plane orientation. For e-beam evaporated Cr films grown at 300 degrees C, scanning electron microscopy shows acicular Cr grains that are elongated in the direction. The grain boundaries occur along (1-10) and (-110) planes, which is explained by the low surface energy of {110} planes in the bcc structure. The direction of the long axes of the grains relative to the substrate are defined by the underlying hexagonal symmetry of the substrate, leading to a unique tri-directional microstructure.
Citation
Applied Physics Letters
Volume
102

Citation

Boekelheide, Z. and Hellman, F. (2013), Cr(11) texture induced by epitaxy on Al(sub2)O(sub3) (0001) substrates: Preferential grain growth in the <001> direction, Applied Physics Letters (Accessed April 18, 2024)
Created April 8, 2013, Updated February 19, 2017