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. 2020 May 19;10:8229. doi: 10.1038/s41598-020-65071-4

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© The Author(s) 2020

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) Cubic, tetragonal and orthorhombic structures of 3D-perovskites as well as the 1D-structure of orthorhombic CsPbI₃. (b) ²⁰⁷Pb NMR spectra of MAPbI₃, CsPbI₃, MAPbBr₃, CsPbBr₃, MAPbCl₃ and CsPbCl₃. The spectra of MAPbI₃, CsPbI₃, MAPbBr_3, and CsPbBr₃ were acquired at 16.4 T and the spectra of MAPbCl₃ and CsPbCl₃ were acquired at 11.7 T at room temperature (RT) using powdered materials. Spinning side bands are marked by asterisks.