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. 2020 Jun 12;8:497. doi: 10.3389/fchem.2020.00497

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Copyright © 2020 Kostiv, Engstová, Krajnik, Šlouf, Proks, Podhorodecki, Ježek and Horák.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(A,C) TEM/EDX and (B,D) TEM/SAED analysis of (A,B) NaYF₄:Yb³⁺/Er³⁺ and (C,D) NaYF₄:Yb³⁺/Er³⁺@NaYF₄:Nd³⁺(0.5 mmol) nanoparticles. Experimental TEM/SAED diffractograms (dashed lines) were compared with theoretically calculated PXRD diffractograms for the hexagonal phase of β-NaYF₄ (full lines).