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. 2019 Feb 4;9(2):202. doi: 10.3390/nano9020202

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© 2019 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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Frequency dependencies of permittivity: real (a) and imaginary (b) parts for S_r0.3Ba_0.4Pb_0.3Fe₁₂O₁₉/(CuFe₂O₄)_x composite samples (x = 2, 3, 4 and 5).