| Abstract: |
Nickel ferrite (NiFe₂O₄) represents a significant class of spinel ferrite materials exhibiting remarkable structural, spectral, and magnetic properties that make them invaluable for diverse technological applications. The strategic incorporation of transition metal dopants, particularly zinc (Zn) and cobalt (Co), has emerged as a powerful approach to engineer and optimize these intrinsic properties for specific applications ranging from magnetic storage to biomedical devices. This comprehensive review examines the extensive body of research focused on Zn and Co doped NiFe₂O₄ systems, providing critical analysis of synthesis methodologies, characterization techniques, and property modifications. The survey encompasses various synthesis routes including sol-gel, co-precipitation, hydrothermal, and combustion methods, while systematically analyzing their influence on crystallographic structure, lattice parameters, grain morphology, and magnetic behavior. Particular emphasis is placed on understanding how dopant concentration affects cation distribution between tetrahedral and octahedral sites, consequently influencing magnetic interactions and overall material performance. Spectroscopic investigations through X-ray diffraction, Fourier-transform infrared spectroscopy, and Raman spectroscopy reveal significant insights into structural modifications and bonding characteristics. The review critically evaluates magnetization mechanisms, coercivity variations, and saturation magnetization trends as functions of dopant composition. This meta-analysis identifies research gaps, discusses conflicting findings in existing literature, and proposes future directions for advancing fundamental understanding and practical applications of doped nickel ferrite systems. |
