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Research & Development in Material Science

A Study on Synthesis, Structural and Magnetic Properties of La2O3 Doped Isotropic Ba-M Ferrites

  • Open or CloseZubair Ahmad1* Shakir Khan1 and Shan Tao2*

    1Ibn-e-Sina Institute of Technology, Pakistan

    2Magnetism Key Laboratory of Zhejiang Province, China Jiliang University, Hangzhou, China

    *Corresponding author:Zubair Ahmad, Ibn-e-Sina Institute of Technology, Sector H-11/4, Islamabad, Pakistan

Submission: July 13, 2020;Published: August 13, 2020

DOI: 10.31031/RDMS.2020.13.000825

ISSN : 2576-8840
Volume13 Issue5


Present work reports the synthesis, structural and magnetic properties of BaFe11O17.5 and La2O3 doped  (Ba La0.05Fe11O17.575, BaLa0.1Fe11O17.65, BaLa0.2Fe11O17.80 and BaLa0.3Fe11O17.95) ferrites produced through powder metallurgy method with escalated magnetic properties. Phase evaluation, crystal structure, microstructure, and magnetic properties thermomagnetic characteristics for the La doped and La free ferrites have been investigated at varying sintered temperatures. XRD studies revealed that BaFe12O19 phase is formed at 900  ̊C through the reaction of Fe2O3 and BaFe2O4. Electron microscopy studies elucidated that microstructural features depend critically on the heat treatment conditions as well as La content. La addition up to 1.0 mole found to be beneficial to refine particle size close to single domain wall size, which, in turn, led to enhance magnetic properties of the ferrite. Optimum magnetic properties for the La free BaFe11O17.5 are Hc=4.4kOe, Br=1.9kG, and (BH)max=0.85MGOe which were improved to Hc=4.9kOe, Br=2.4kG and (BH)max=1.2MGOe with La2O3 additive. The La2O3 acts as a grain growth inhibitor and led to enhance high coercivity of 4.9kOe in the ferrite. The dielectric constant and dielectric loss factor decrease monotonically with increasing applied frequency at the constant temperature. Permeability is found to be sensitive to density and microstructural components like grain size and porosity of the sintered ferrites.

Keywords: Isotropic sintered ferrites; Powder metallurgy; Dielectric properties; Magnetic properties; Microstructure

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