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. 2020 Jan 15;7(1):191139. doi: 10.1098/rsos.191139

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© 2020 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 1. — (a) TEM micrographs of Zn_0.5Fe_2.5O₄ NPs. (b) High-resolution TEM image of Zn_0.5Fe_2.5O₄ NPs. (c) TEM micrographs of silica-coated Zn_0.5Fe_2.5O₄ NPs. (d) XRD pattern of Zn_0.5Fe_2.5O₄/SiO₂ NPs, the main reflections are (220), (311), (222), (400), (511), (440) according to PDF#86-0509-jade. (e) Hysteresis loop for 22 nm Zn_0.5Fe_2.5O₄/SiO₂ NPs recorded at room temperature pointing to the superparamagnetic characteristics of NPs. (f) Field dependence of SAR for Zn_0.5Fe_2.5O₄/SiO₂ NPs. (g) Heating curves of aqueous solutions of 22 nm Zn_0.5Fe_2.5O₄/SiO₂ NPs (1 mg NPs ml⁻¹).