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. 2019 Oct 8;10:4559. doi: 10.1038/s41467-019-12168-8

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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. 7 — Instability of Mg-CaCO₃ for a range of Mg composition. (104) XRD peak from Mg-calcite crystallized from hydrothermally treated Mg-ACC in solution. Data were acquired by synchrotron radiation (λ = 0.496 $\dot{A}$ ). Numbers near the peaks are the η (Mg/Ca + Mg) in the calcite crystals, obtained from the refined lattice parameters and the equations linking the lattice parameters and η obtained by Zolotoyabko et al.²⁴. The diffractograms are normalized to the highest diffraction peaks (calcite (104) peak for the powders precipitated from solutions containing 0 or 50% Mg in solutions, and aragonite peak for the other powders)