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. 2018 May 25;8:8093. doi: 10.1038/s41598-018-26461-x

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© The Author(s) 2018

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) Normalized Raman spectra obtained with the He-Ne laser line. The spectra have not been displaced vertically so that the increment of the monotonically decaying signal (MDS) at low wavenumbers increases as the value of [Cu]/[Te] rises, as indicated by the arrow; (b) comparison of the crystalline structure of (i) vulcanite (CuTe) and (ii) weissite (Cu_2−xTe). The former does not include copper vacancies, while the latter possesses copper lattice sites randomly occupied. These are indicated by partially filled spheres, with the filling being proportional to the occupation probability.