Effects of Sintering Temperature on Structural, Morphological and Magnetic Properties of Strontium Ferrite Nanoparticles

• Published in: Journal of superconductivity and novel magnetism Vol. 32; no. 4; pp. 1067 - 1076
• Main Authors: Mousavi Ghahfarokhi, S. E., Mohammadzadeh Shobegar, E., Zargar Shoushtari, M.
• Format: Journal Article
• Language: English
• Published: New York Springer US 15.04.2019
• Subjects: Characterization and Evaluation of Materials; COERCIVE FORCE; Condensed Matter Physics; CURIE POINT; DIFFERENTIAL THERMAL ANALYSIS; FERRITES; FIELD EMISSION; FOURIER TRANSFORMATION; GRAIN GROWTH; INFRARED SPECTRA; LATTICE PARAMETERS; Magnetic Materials; MAGNETIC PROPERTIES; Magnetism; MAGNETIZATION; NANOPARTICLES; NANOSCIENCE AND NANOTECHNOLOGY; Original Paper; Physics; Physics and Astronomy; SCANNING ELECTRON MICROSCOPY; SOL-GEL PROCESS; SPINELS; Strongly Correlated Systems; STRONTIUM COMPOUNDS; Superconductivity; THERMAL GRAVIMETRIC ANALYSIS; VIBRATING SAMPLE MAGNETOMETERS; X-RAY DIFFRACTION; X-RAY SPECTROSCOPY; Sintering temperature; Nanoparticle; Structural properties; Magnetic properties; Curie temperature
• ISSN: 1557-1939; 1557-1947
• DOI: 10.1007/s10948-018-4799-0

In the present investigation, structural, morphological and magnetic properties of SrFe 2 O 4 ferrite nanoparticles prepared by a sol–gel method were studied. The techniques used in this investigation were thermogravimetric analysis/differential thermal analysis (TGA/DTA), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDX), field emission scanning electron microscopy (FESEM), Fourier transform infrared spectrometry (FT-IR), vibrating sample magnetometry (VSM) and Curie temperature analysis. The average crystallite sizes of the SrFe 2 O 4 were calculated using the Scherrer formula and found in the range of 11–22 nm, and this can be attributed to the grain growth of the particles. The lattice parameter of SrFe 2 O 4 nanoparticles decreased from 6.64 to 6.51 nm as the sintering temperature was raised from 600 to 900 °C. FT-IR analysis confirmed that bands in the range 430–590 cm − 1 are due to the stretching vibration of oxygen atom and metal ions (M–O) that is Fe–O confirming the formation of spinel ferrite. Surface morphology of the samples has been studied using FESEM. The elemental composition along with their relative ratios was given by EDX and was found to be in agreement with their initial calculated values. The saturation magnetization, magnetic coercivity and remanence increase with an increasing sintering temperature from 600 to 900 °C. The present study reports the Curie temperature with an amount of 551 °C of the synthesized strontium nanoferrites using the Faraday technique.