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. 2020 Feb 9;13(3):785. doi: 10.3390/ma13030785

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(a) XRD pattern of the sample after 6 h of firing at 1000 °C and the subsequent acid leaching, and (b) comparison of XRD patterns (within 36–40°) of the samples before and after acid leaching.

(a) XRD pattern of the sample after 6 h of firing at 1000 °C and the subsequent acid leaching, and (b) comparison of XRD patterns (within 36–40°) of the samples before and after acid leaching.