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Comment on “Twin symmetry texture of energetically condensed niobium thin films on sapphire substrates (a-plane Al2O3)” [J. Appl. Phys.110, 033523 (2011)]
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In their recent publication, Zhao et al. [J. Appl. Phys. 110, 033523 (2011)] claim to have found a new three-dimensional relationship for niobium-on-sapphire epitaxy. However, two critical errors were made in the analysis of x-ray diffraction measurements. The crystal structure of sapphire (α-Al2O3) was erroneously cited as hexagonal close-packed, and crystallographic orientations of sapphire were misidentified. Correcting these errors, one finds their claim unjustified.
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