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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/).
(a) A comparison of the dielectric loss spectra collected for the same temperatures and samples for x = 0.0 (empty symbols) and x = 2.0 (full symbols). (b) A comparison of the loss spectra for different samples at ≈89 K.