Synthesis of Ni0.8Mg0.2Fe2O4 nanoparticles and its impact in enhancing the structural, magnetic, and optical properties of the PVA-CMC polymer blend.

XRD, optical microscope images, and magnetic hysteresis plots of of Ni 0.8 Mg 0.2 Fe 2 O 4 /PVA-CMC nanocomposite films. [Display omitted] • Ni 0.8 Mg 0.2 Fe 2 O 4 spinel ferrite nanoparticles were prepared via sol–gel technique. • Ni 0.8 Mg 0.2 Fe 2 O 4 nanoparticles were used as a dopant material into the PVA-CMC blend to prepare nanocomposites. • The XRD and Raman analysis indicated the interaction between the polymer blend and Ni 0.8 Mg 0.2 Fe 2 O 4 nanoparticles. • Thermal stability of the PVA-CMC/Ni 0.8 Mg 0.2 Fe 2 O 4 films were investigated via DSC analysis. • The bandgap of PVA-CMC blend decreased with increasing Ni 0.8 Mg 0.2 Fe 2 O 4 content. • The magnetic hysteresis plots of composites PVA-CMC/ Ni 0.8 Mg 0.2 Fe 2 O 4 were analyzed at ambient temperature. The production of polymer blend composites with distinctive characteristics is becoming increasingly popular worldwide due to the introduction of innovative properties. Polymer blend films comprising of PVA-CMC matrix doping with Ni 0.8 Mg 0.2 Fe 2 O 4 (2,4,6, and 8 wt%) spinel ferrite nanoparticles were prepared using the solution casting method. The characteristics of the polymer films were analysed using X-ray diffraction (XRD), optical microscope (OM), roughness tester, Raman spectroscopy, and UV–vis spectroscopy. The synthesized of spinel ferrite Ni 0.8 Mg 0.2 Fe 2 O 4 nanoparticles was confirmed by XRD and Raman spectroscopy. The powder's XRD pattern showed the presence of Ni 0.8 Mg 0.2 Fe 2 O 4 in its cubic phase. Similarly, the diffraction pattern of the films confirmed the inclusion of Ni 0.8 Mg 0.2 Fe 2 O 4 spinel ferrite nanoparticles in the PVA-CMC blend. The surface morphology analysis revealed an increase in the film roughness with increasing Ni 0.8 Mg 0.2 Fe 2 O 4 concentration. Differential scanning calorimetry (DSC) explains that the system's thermal stability improves. The absorption edge shifted towards the higher wavelength region with the inclusion of Ni 0.8 Mg 0.2 Fe 2 O 4 in PVA-CMC blend. Consequently, the optical bandgap values were observed to decrease from 5.50 eV to 3.89 eV and from 4.78 eV to 2.89 eV for direct and indirect transitions, respectively, as Ni 0.8 Mg 0.2 Fe 2 O 4 increased from 0 to 8 wt%. The refractive index of the blend films increases from 1.776 for the pure blend to about 3.592, 6.142, 7.789, and 9.680 for 2, 4, 6, and 8 wt% Ni 0.8 Mg 0.2 Fe 2 O 4 respectively. The optical conductivity was found to increase from 1.02 × 1011 to about 9.82 × 1012 S-1 for pure blend and PVA-CMC/8 wt% Ni 0.8 Mg 0.2 Fe 2 O 4 films, respectively. Also, other optical parameters like optical basicity and electronegativity showed an enhancement with the incorporation of Ni 0.8 Mg 0.2 Fe 2 O 4 nanoparticles in the PVA-CMC blend. The magnetic hysteresis plots of composites PVA-CMC/Ni 0.8 Mg 0.2 Fe 2 O 4 exhibited ferromagnetic behavior characterized by a distinct magnetic hysteresis loop. [ABSTRACT FROM AUTHOR]