Effect of Ni substitution on the structural, magnetic and magnetocaloric properties of Zn0.5-xNixMg0.5Fe2O4 (x = 0, 0.125 and 0.250) ferrites
Abstract
The structural, magnetic and magnetocaloric properties of Zn0.5-xNixMg0.5Fe2O4 (x = 0, 0.125, 0.250) ferrites were investigated in detail. The double sintering ceramic process was used to synthesize our samples. The formation of cubic phase of Zn-Ni-Mg ferrite was confirmed through XRD technique. The structural analysis showed that the unit cell volume decreased with increasing Ni content. All compounds exhibited a ferromagnetic-paramagnetic phase transitions of a second order. The entropy change was obtained from the measurements of magnetic isotherms M(H,T) using the Maxwell relation. The maximum magnetic entropy Δ SMmax decreases from 1.36 J.Kg-1K-1 (x = 0) to 1.16 J.Kg-1K-1 (x = 0.25) under an applied magnetic field of 5T upon increasing Ni content. Relative cooling power (RCP) was determined as well. It was found to be 107 and 90 J/kg for x = 0 and x = 0.25, respectively. These results make our compounds promising materials for magnetic refrigeration technology.
- Publication:
-
Solid State Sciences
- Pub Date:
- March 2020
- DOI:
- 10.1016/j.solidstatesciences.2020.106137
- Bibcode:
- 2020SSSci.10106137F
- Keywords:
-
- Spinel ferrite;
- Double ceramic sintering;
- Rietveld refinement;
- Magnetic and magnetocaloric effect