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Publication Citation: Cr(11) texture induced by epitaxy on Al(sub2)O(sub3) (0001) substrates: Preferential grain growth in the <001> direction

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Author(s): Zoe A. Boekelheide; F Hellman;
Title: Cr(11) texture induced by epitaxy on Al(sub2)O(sub3) (0001) substrates: Preferential grain growth in the <001> direction
Published: April 08, 2013
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 <001> 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
Pages: pp. 141601-1 - 141601-3
Research Areas: Materials Science