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Beilstein J. Nanotechnol. 2019, 10, 1348–1359, doi:10.3762/bjnano.10.133
Figure 1: (a) XRD patterns of the CoxFe3−xO4 (0 ≤ x ≤1) nanoparticles. (b) Shift of the (440) reflection.
Figure 2: Rietveld-refined XRD pattern of the x = 0.2 sample.
Figure 3: FE-SEM images of CoxFe3−xO4 nanoparticles: (a) x = 0.0; (b) x = 0.2; (c) x = 0.4; (d) x = 0.6; (e) x...
Figure 4: EDX spectra of CoxFe3−xO4 nanoparticles: (a) x = 0.2; (b) x = 0.6; and (c) x = 1.0. (d) Comparison ...
Figure 5: FTIR spectra of CoxFe3−xO4 nanoparticles with x = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0. The inset is the...
Figure 6: Polyhedral model showing the cubic spinel crystal structure of CoFe2O4. Green and blue shaded areas...
Figure 7: TGA curve of the CoFe2O4 sample.
Figure 8: Room-temperature magnetization curves of the CoxFe3−xO4 samples measured. The inset shows the magne...
Figure 9: The M–1/H2 dependence of the CoxFe3−xO4 samples at high field strengths. Experimental data are mark...
Figure 10: Effective anisotropy constant (Keff) and coercivity (Hc) of the CoxFe3−xO4 samples.
Figure 11: IRM and DCD magnetization curves of (a) all CoxFe3−xO4 samples and separately for (b) x = 0.2, (c) x...
Figure 12: δm as a function of the magnetic field strength measured at room temperature. The inset shows the H...
Figure 13: Temperature rise in CoxFe3−xO4 suspensions in an ac magnetic field (27 Oe, 92 kHz) as a function of...