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. 2017 Apr 11;7:786. doi: 10.1038/s41598-017-00865-7

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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(a) Cross-section high-resolution TEM (HRTEM) image of 1 µm-thick BN grown on sapphire substrate which was taken along zone axis of <1 1–2 0>. Inset is the Fourier transform (FT) pattern for the selected area. (b) Higher magnification of the t-BN part showing randomly oriented BN nanofibers. (c) The initial layer near the substrate surface with the FT pattern in the inset confirming the hexagonal phase.