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. 2018 Aug 29;13:257. doi: 10.1186/s11671-018-2671-6

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© The Author(s). 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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.

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Fig. 4 — a UV-visible diffuse reflectance spectra of BiFeO₃, Ag₃PO₄, and Ag₃PO₄/BiFeO₃ composites. b The corresponding absorption spectra and c the corresponding first derivative of the diffuse reflectance spectra