Rapid Synthesis of Nanocrystalline NiFe2O4 and CoFe2O4 Powders by a Microwave-Assisted Combustion Method

• Published in: Journal of superconductivity and novel magnetism Vol. 26; no. 4; pp. 1391 - 1396
• Main Author: Koseoglu, Yuksel
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Boston Springer US 01-04-2013; Springer
• Subjects: Characterization and Evaluation of Materials; Combustion; Condensed Matter Physics; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Cross-disciplinary physics: materials science; rheology; Crystallites; Diamagnetism, paramagnetism and superparamagnetism; Exact sciences and technology; Ferromagnetism; Heating; Magnetic Materials; Magnetic properties and materials; Magnetism; Materials science; Materials synthesis; materials processing; Nanocrystalline materials; Nanocrystals; Nanomaterials; Nanopowders; Nanoscale materials and structures: fabrication and characterization; Nanostructure; Original Paper; Physics; Physics and Astronomy; Strongly Correlated Systems; Superconductivity; Transmission electron microscopy; VSM; XRD; Ni–Co spinel ferrites; Microwave assisted combustion synthesis; TEM; Magnetic nanoparticles; Combustion synthesis; Spherical shape; Microwave radiation; Porous materials; Ni―Co spinel ferrites; Microwave heating; Magnetic measurement; Scanning tunneling microscopy; Cobalt Iron Oxides Mixed; Transmission electron microscopy; Spinels; Iron Nickel Oxides Mixed; Nanopowder; Microstructure; Nanocrystal
• ISSN: 1557-1939; 1557-1947
• DOI: 10.1007/s10948-012-1972-8

A facile and rapid microwave-assisted combustion method was applied to synthesize the nanocrystalline NiFe
2
O
4
and CoFe
2
O
4
powders. The results suggested that application of microwave heating to synthesize the homogeneous porous NiFe
2
O
4
and CoFe
2
O
4
powders was achieved in a few minutes. The structure and morphology of the as-prepared nanocrystalline powders of NiFe
2
O
4
and CoFe
2
O
4
were investigated by means of X-ray diffraction (XRD) and tunneling electron microscopy (TEM). The XRD spectra confirmed the formation of spinel structure with a crystallite size of 30.03 nm for NiFe
2
O
4
and 36.7 nm for CoFe
2
O
4
nanopowders, and TEM results indicated spherical shape of the products. Magnetic measurements revealed that at room temperature while NiFe
2
O
4
is superparamagnetic, CoFe
2
O
4
shows ferromagnetic behavior.