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. 2019 Jan 8;10:72. doi: 10.1038/s41467-018-07877-5

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© The Author(s) 2019

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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Fig. 1 — Structure analysis on Cu₂Se. a Synchrotron radiation powder diffraction patterns at room temperature (RT) and b 473 K together with Rietveld analysis data including space groups R-factors and lattice constants. c High/low-temperature crystal structure of Cu₂Se. d Phase fractions of α-Cu₂Se and β-Cu₂Se as obtained from Rietveld analysis