Evidence of enhanced ferromagnetic nature and hyperfine interaction studies of Ce-Sm doped Co-Ni ferrite nanoparticles for microphone applications. Issue 15 (15th October 2018)

• Record Type: Journal Article
• Authors: Srinivasamurthy, K.M.; Angadi, V.Jagadeesha; Kubrin, S.P.; Matteppanavar, Shidaling; Kumar, P. Mohan; Rudraswamy, B.
• Is Part Of: Ceramics international. Volume 44:Issue 15(2018)
• Page Start: 18878
• Page End: 18885
• Publication Date: 2018-10-15
• Subjects: Co-Ni ferrites -- solution combustion method -- magnetic properties -- Mössbauer spectroscopy -- rare earths; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2018.07.123
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: We present the results of the structural, Magnetic and low temperature Mössbauer spectroscopy studies of Co0.5 Ni0.5 Fe2-(x+y) Cex Smy O4 (where x, y = 0.0, 0.01, 0.015 and 0.02) which was prepared by the solution combustion route using mixture of glucose and urea as fuel. The prepared samples were subjected to X-Ray Diffractometer (XRD), Transmission Electron Spectroscopy (TEM), Vibrating Sample Magnetometry (VSM) and Mössbauer Spectroscopy at room temperature and low temperature (15 K) to understand the phase, structure and magnetic behavior of the samples. The results of XRD reveals the formation of a single phase spinel cubic structure with space group Fd 3 ̅ m . The crystallite sizes are found to be increasing with increasing Ce 3+ and Sm 3+ content. This is due to the fact that bigger ionic radii of Ce 3+ and Sm 3+ replace Fe 3+ ions at B site. The lattice parameter is found to be increasing with the increasing Ce 3+ and Sm 3+ content due to increased internal strain upon doping. The TEM micrographs reveals that the particles almost appear as spherical and agglomerated. Magnetic measurements show that all the obtained samples exhibit higher saturation magnetization (MS ), remanence (Mr ), coercivity (HC ), anisotropy constant (K) and magneton number (ηB ). This is due to the increase in A-B super exchange interaction in the samples. Further the increase in HC with the dopant concentration is interpreted as the enhanced magnetic pinning and ferromagnetic behavior in the samples. The room temperature Mössbauer spectra consist of broadened magnetic sextet and paramagnetic quadrupole-split lines. The presence of the magnetic sextet and doublet component on the Mössbauer spectra indicate the presence of superparamagnetic relaxation with a higher TB than the room temperature. The obtained results suggest that the rare earth doped Co-Ni ferrites are potential candidates for microphone applications.