Effects of Bi{sup 3+} Substitution on Structural, Morphological, and Magnetic Properties of Cobalt Ferrite Nanoparticles

Journal Article · Tue Oct 15 00:00:00 EDT 2019 · Journal of Superconductivity and Novel Magnetism

DOI:https://doi.org/10.1007/S10948-019-5058-8· OSTI ID:22919533

Ghahfarokhi, S. E. Mousavi,

In this research, the structural, morphological, and magnetic properties of Bi-doped cobalt ferrite (CoFe{sub 2-x}Bi{sub x}O{sub 4}) nanoparticles with x = 0.0, 0.05, 1, 0.15, and 0.2, prepared by the sol-gel method, were studied. In order to characterize the samples, several equipment and analyses including thermo-gravimetric and differential thermal analysis (TGA/DTA), X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), Fourier transform infrared spectrometer (FT-IR), and vibrating sample magnetometer (VSM) were used. The average crystallite sizes of the prepared CoFe{sub 2-x}Bi{sub x}O{sub 4} were calculated using the Scherer, UDM, SSP, and Halder-Wagner methods. The average crystallite sizes for the samples were found in the range of 26 to 44 nm, which can be attributed to the grain growth of the particles. FT-IR spectrum showed bands in the range of 430 to 590 cm{sup −1} due to the stretching vibration of an oxygen atom and metal ions (Fe-O), confirming the formation of spinel ferrite. Surface morphology of the samples was studied using FESEM. The VSM results showed that the saturation and remanence magnetizations increased by raising the doping values up to x = 0.1. The Curie temperature of the cobalt nanoferrites was determined using Faraday’s technique. The highest Curie temperature was found to be 580 °C for the undoped sample.

• OSTI ID: 22919533
• Journal Information: Journal of Superconductivity and Novel Magnetism, Vol. 32, Issue 10; Conference: ICSM2018: 6. International Conference on Superconductivity and Magnetism, Antalya (Turkey), 29 Apr - 4 May 2018; Other Information: Copyright (c) 2019 Springer Science+Business Media, LLC, part of Springer Nature; Country of input: International Atomic Energy Agency (IAEA); ISSN 1557-1939
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
BISMUTH ADDITIONS
COBALT COMPOUNDS
CRYSTAL STRUCTURE
CURIE POINT
DIFFERENTIAL THERMAL ANALYSIS
DOPED MATERIALS
FERRITES
FIELD EMISSION
FOURIER TRANSFORMATION
INFRARED SPECTRA
MAGNETIC PROPERTIES
MAGNETIZATION
NANOPARTICLES
SATURATION
SCANNING ELECTRON MICROSCOPY
SOL-GEL PROCESS
THERMAL GRAVIMETRIC ANALYSIS
VIBRATING SAMPLE MAGNETOMETERS
X-RAY DIFFRACTION