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Title: Cr(110) texture induced by epitaxy on Al 2O 3 (0001) substrates: Preferential grain growth in the ⟨001⟩ direction

Abstract

Chromium exhibits (110) textured growth on Al 2O 3(0001) substrates induced by epitaxy. Epitaxy occurs in nine distinct orientations, leading to a polycrystalline film of grains with (110) out-of-plane orientation but different in-plane orientations. For e-beam evaporated films, scanning electron microscopy shows acicular Cr grains elongated in the 001 direction. Grain boundaries occur along (110) 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 is defined by the underlying hexagonal symmetry of the substrate, leading to a unique tri-directional microstructure.

Authors:
 [1];  [2]
  1. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States); Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22), Materials Sciences & Engineering Division (SC-22.2)
OSTI Identifier:
1511359
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 102; Journal Issue: 14; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Boekelheide, Zoe, and Hellman, F. Cr(110) texture induced by epitaxy on Al2O3 (0001) substrates: Preferential grain growth in the ⟨001⟩ direction. United States: N. p., 2013. Web. doi:10.1063/1.4801083.
Boekelheide, Zoe, & Hellman, F. Cr(110) texture induced by epitaxy on Al2O3 (0001) substrates: Preferential grain growth in the ⟨001⟩ direction. United States. doi:10.1063/1.4801083.
Boekelheide, Zoe, and Hellman, F. Mon . "Cr(110) texture induced by epitaxy on Al2O3 (0001) substrates: Preferential grain growth in the ⟨001⟩ direction". United States. doi:10.1063/1.4801083. https://www.osti.gov/servlets/purl/1511359.
@article{osti_1511359,
title = {Cr(110) texture induced by epitaxy on Al2O3 (0001) substrates: Preferential grain growth in the ⟨001⟩ direction},
author = {Boekelheide, Zoe and Hellman, F.},
abstractNote = {Chromium exhibits (110) textured growth on Al2O3(0001) substrates induced by epitaxy. Epitaxy occurs in nine distinct orientations, leading to a polycrystalline film of grains with (110) out-of-plane orientation but different in-plane orientations. For e-beam evaporated films, scanning electron microscopy shows acicular Cr grains elongated in the 001 direction. Grain boundaries occur along (110) 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 is defined by the underlying hexagonal symmetry of the substrate, leading to a unique tri-directional microstructure.},
doi = {10.1063/1.4801083},
journal = {Applied Physics Letters},
number = 14,
volume = 102,
place = {United States},
year = {2013},
month = {4}
}

Journal Article:
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Figures / Tables:

FIG. 1 FIG. 1: RHEED patterns for (a) bare Al2O3(0001) substrate and (b) Cr(110)/Al2O3(0001) film after deposition. Part (c) shows the RHEED pattern from (b) with a superposition of two indexed patterns overlayed in blue and red. The two diffraction patterns are (d) a square lattice diffraction pattern associated with the Cr(110)more » surface with the incident electron beam along a (001) direction in the plane and (e) a triangular lattice dfifraction pattern of the Cr(110) surface with the incident beam along a (1 $\bar{1}$ $\bar{1}$) or ($\bar{1}$ 1 $\bar{1}$) direction in the plane. The 110 spots of the two patterns overlap.« less

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.