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NixMn0.25-xMg0.75Fe2O4 nano-ferrites (where x = 0.00, 0.05, 0.10, 0.15 and0.20) were produced via sol-gel auto-combustion technique. Investigations weredone into how the incorporation of Ni ions affects the Mn0.25Mg0.75Fe2O4ferrite's structure, morphological, magnetic, and NO2 gas sensing features. Allthe samples are single-phase, based on the structural study utilizing the X-raydiffraction (XRD) pattern. In terms of the structure of the cubic spinel,according to the XRD study, the crystallite sizes range from 24.30 to 28.32 nm,indicating nano-crystallinity. The synthesis of spherical nanoparticles with asmall modification in particle size distribution was verified via FE-SEMimages. The study found that the size of particles is tiny enough to actsuperparamagnetically. The area of hysteresis loop is almost non-existing, thusreflecting typical soft magnetic materials according to magnetic measurementsby VSM carried out at room temperature. Furthermore, the conductance responsesof the NixMn0.25-xMg0.75Fe2O4 nano-ferrite were measured by exposing theferrite to oxidizing (NO2) gas at different operating temperatures. The resultsshow that the sensor boasts shorter response and recovery times, as well as ahigher sensitivity 707.22% of the sample (x=0.20) for nano-ferrite.

Preparation and Characterization of NixMn0.25-xMg0.75Fe2O4 Nano-ferrite as NO2 Gas Sensing Material