Effect of La³⁺ Substitution on the Structural and Magnetic Properties of Mn-Zn Ferrite Prepared by Sol-Gel Auto-Combustion Method

Abstract:

Spinel ferrite with the chemical formula of Mn_0.5Zn_0.5La_xFe_2-xO₄ (x = 0.02, 0.04, 0.06, 0.08, 0.10) were prepared by a sol-gel auto-combustion method. The effect of the rare-earth substitution on the microstructural properties of the synthesized powders were investigated through X-ray diffraction (XRD) and field-emission scanning electron microscopy (FESEM), while for the magnetic properties, vibrating sample magnetometer (VSM) measurements were made. XRD patterns revealed characteristic peaks corresponding to spinel Mn-Zn ferrite structures with accompanying secondary phases, such as Fe₂O₃ and LaFeO₃. The initial addition of La³⁺ into the spinel ferrite system resulted in an initial spike of the lattice parameter and crystallite size before proceeding to decrease as the rare-earth content continues to decrease. FESEM micrographs reveals agglomerated particles with considerable grain size distribution. The magnetic properties, especially the saturation magnetization, M_s, was found to decrease with each increase in La³⁺ substitution. The research findings revealed the critical influence of the La³⁺ substitution towards the overall structural and magnetic properties of the Mn-Zn ferrite samples.

• Periodical: Materials Science Forum (Volume 916)
• Pages: 91-95
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.916.91
• Online since: March 2018
• Authors: Beh Hoe Guan*, Muhammad Hanif bin Zahari, Kean Chuan Lee
• Keywords: Magnetic Properties, Mn-Zn Ferrite, Rare-Earth Substitution, Structural Property

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