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. 2019 Nov 20;10:5266. doi: 10.1038/s41467-019-13178-2

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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. 2 — Crystal structure of Na_2.88Sb_0.88W_0.12S₄ heated at 275 °C for 12 h. a Rietveld refinement profiles of X-ray powder diffraction data for Na_2.88Sb_0.88W_0.12S₄. Red dots and black lines denote the observed and calculated XRD patterns, respectively. The green sticks mark the position of the reflections for Na_2.88Sb_0.88W_0.12S₄. The difference between the observed and calculated patterns is indicated by the blue line. b Crystal structure of cubic Na_2.88Sb_0.88W_0.12S₄ with the unit cell outlined. The Na, Sb, W, and S sites are represented by blue, orange, gray, and yellow balls, respectively. Na is linearly arranged, and distortion of the Sb₄/WS₄ tetrahedra is very small compared to the tetragonal structure of Na₃SbS₄ (Supplementary Fig. 3)