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Khanahmadisamghabadi, Siavash, Madaah Hosseini, Hamid Reza, Pircheraghi, Gholamreza. (1404). Nanostructured spinel ferrites NiFe2O4 and CoFe2O4: influence of cation substitution on crystal structure, surface stability, and magnetic behavior. , 58(2), 132-142. doi: 10.22059/jufgnsm.2025.02.01
Siavash Khanahmadisamghabadi; Hamid Reza Madaah Hosseini; Gholamreza Pircheraghi. "Nanostructured spinel ferrites NiFe2O4 and CoFe2O4: influence of cation substitution on crystal structure, surface stability, and magnetic behavior". , 58, 2, 1404, 132-142. doi: 10.22059/jufgnsm.2025.02.01
Khanahmadisamghabadi, Siavash, Madaah Hosseini, Hamid Reza, Pircheraghi, Gholamreza. (1404). 'Nanostructured spinel ferrites NiFe2O4 and CoFe2O4: influence of cation substitution on crystal structure, surface stability, and magnetic behavior', , 58(2), pp. 132-142. doi: 10.22059/jufgnsm.2025.02.01
Khanahmadisamghabadi, Siavash, Madaah Hosseini, Hamid Reza, Pircheraghi, Gholamreza. Nanostructured spinel ferrites NiFe2O4 and CoFe2O4: influence of cation substitution on crystal structure, surface stability, and magnetic behavior. , 1404; 58(2): 132-142. doi: 10.22059/jufgnsm.2025.02.01

Nanostructured spinel ferrites NiFe2O4 and CoFe2O4: influence of cation substitution on crystal structure, surface stability, and magnetic behavior

Journal of Ultrafine Grained and Nanostructured Materials
مقاله 1، دوره 58، شماره 2، اسفند 2025، صفحه 132-142    اصل مقاله (909.69 K)
نوع مقاله: Research Paper
شناسه دیجیتال (DOI): 10.22059/jufgnsm.2025.02.01
نویسندگان
Siavash Khanahmadisamghabadi؛ Hamid Reza Madaah Hosseini* ؛ Gholamreza Pircheraghi
Department of Materials Science and Engineering, Sharif University of Technology (SUT), Tehran, Iran
چکیده
Nanostructured spinel ferrites NiFe2O4 and CoFe2O4 were synthesized via a chemical co-precipitation route under identical conditions to enable a direct comparison of their cation-dependent structure, colloidal stability, and magnetic behavior. X-ray diffraction (XRD) confirmed the formation of single-phase cubic spinels with nanoscale crystallites. The broad peaks reflected nanoscale crystallites; however, field-emission scanning electron microscopy (FESEM) revealed agglomerated nanoparticles with an average particle size of ~100 nm. Dynamic light scattering (DLS) revealed hydrodynamic diameters of 185 nm for CoFe2O4 and 171 nm for NiFe2O4, while the zeta potentials of -29 mV and -37 mV indicated moderate and higher colloidal stability, respectively. Magnetic measurements demonstrated a clear contrast between the two ferrites: CoFe2O4 exhibited higher saturation magnetization (75 emu g-1) and coercivity (860 Oe) than the softer NiFe2O4 (36 emu g-1, 139 Oe). The corresponding squareness ratios of 0.45 and 0.22 supported the transition from hard to soft magnetic behavior with cation substitution. These findings reveal that replacing Ni2+ with Co2+ increases magnetocrystalline anisotropy and magnetic hardness while slightly lowering colloidal stability, establishing a direct link between cation type, structural order, and magnetic performance in spinel ferrite nanostructures.
کلیدواژه‌ها
Nanostructured spinel ferrites؛ NiFe2O4 and CoFe2O4 nanoparticles؛ Cation substitution؛ Chemical co-precipitation؛ Magnetic properties
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