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. 2020 Feb 5;13(3):731. doi: 10.3390/ma13030731

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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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XRD patterns for ceramics with composition L3.5T20, sintered at different temperatures for 2 h. The 001, 100, 002 and 200 peaks of the tetragonal phase were identified with the (T) letter, while the 110, 001, 220 and 002 peaks of the orthorhombic phase were identified in with the (O) letter. Asterisks mark peaks belonging to the secondary phase K $_{3}$ Li $_{2}$ Nb $_{5}$ O $_{15}$ . Inset graph shows the evolution of the $α$ parameter with the sintering temperature.