Structural properties and magnetic interactions in Al3+ and Cr3+ co-substituted CoFe2O4 ferrite

• Published in: Central European journal of chemistry Vol. 8; no. 2; pp. 419 - 425
• Main Authors: More, Surendra S., Kadam, Ram H., Kadam, Ankush B., Mane, Dhanraj R., Bichile, Govind K.
• Format: Journal Article
• Language: English
• Published: Heidelberg SP Versita 01.04.2010; Versita; De Gruyter
• Subjects: Biochemistry; Biological and Medical Physics; Biophysics; Chemical synthesis; Chemistry; Chemistry and Materials Science; Chemistry/Food Science; Geochemistry; Magnetic measurements; Magnetization; Research Article; Substituted CoFe2O4 ferrite; X-ray diffraction; Substituted CoFe; Magnetization; X-ray diffraction; Magnetic measurements; ferrite; Chemical synthesis; O
• ISSN: 1895-1066; 2391-5420; 1644-3624; 2391-5420
• DOI: 10.2478/s11532-009-0145-5

A series of CoAl x Cr x Fe 2−2x O 4 systems (x = 0.1 to 0.5 in steps of x = 0.1) spinel ferrites have been synthesized successfully using wet chemical co-precipitation technique. The samples were characterized by X-ray diffraction (XRD), infrared spectroscopy (IR) and magnetization measurements. The powder XRD patterns confirm the single phase spinel structure for the materials synthesized. X -ray diffraction measurements were performed to yield the lattice constant as function of the amount x corresponding to Al-Cr substitution. Lattice parameters, X-ray density, bulk density and particle size decrease whereas porosity increases with the increase in Al-Cr content, ‘x’. Infrared studies show two absorption bands at about 400 cm −1 and 600 cm −1 for octahedral and tetrahedral sites, respectively. Saturation magnetization decreases with the increase in Al-Cr content x. AC magnetic susceptibility measurements were carried out as a function of temperature to measure the Curie temperature, which was found to decrease with Al-Cr content x. The decrease of Curie temperature has been explained by A-B interaction.