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. Author manuscript; available in PMC: 2021 Feb 22.
Published in final edited form as: Mater Sci Energy Technol. 2019;2(2):150–160. doi: 10.1016/j.mset.2019.01.009

Fig. 7.

Fig. 7.

Temperature dependence of the real v0 (full symbols) and imaginary v00 (open symbols) components of the AC susceptibility with oscillating field of 5 Oe at different frequencies. The different catalyst shown are (a) MnFe2O4 10PVA, (b) MnFe2O4 15PVA, (c) MnFe2O4 20PVA, (d) Mn0.5Fe2.5O4 15PVA, (e) Mn2.5Fe0.5O4 15PVA Non-zero remnant magnetization and non-superposition of field-cooling (FC) and zero field-cooling (ZFC) curves also indicate the existence of nanoparticles with blocking temperature over 300 K (Figs. 3–10).