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. 2016 Jul 12;11:328. doi: 10.1186/s11671-016-1544-0

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© The Author(s). 2016

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. 7 — FE-SEM micrographs of the products calcined from NO₃ ⁻- and SO₄ ²⁻-L(Y_0.98Eu_0.02)Hs at the different temperatures. FE-SEM micrographs showing morphologies of the products calcined from NO₃ ⁻- and SO₄ ²⁻-L(Y_0.98Eu_0.02)Hs at the temperatures for (a) 800 °C, (b) 900 °C and (c) 1100 °C