Influence of La, Mn and Zn Substitution on the Structure, Magnetic and Absorption Properties of M-Type Barium Ferrites

Abstract:

A series of M-type barium ferrites with chemicals composition BaFe₁₂O₁₉ and Ba_0.7La_0.3Fe_(12-2x)(MnZn)_xO₁₉ (with x = 0.0, 0.2, 0.5) were synthesized using a chemical coprecipitation based technique. The sample was then called as BFO and BLF, BLFMZ-02 and BLFMZ-05, respectively. The structural parameters were measured by applying the full pattern fitting of Rietveld method using Fullprof program. The crystallite size was calculated using Scherrer formula and Williamson-Hall analysis method, and also confirmed by scanning electron microscope (SEM) and transmission electron microscope (TEM). The morphology of particle is composed of fine-grained aggregates with particle size distributions in the range of 70nm - 160nm. The lattice parameter (a = b and c), cell volume (V_cell) and density (ρ) of the samples were found to be changed with La, Mn and Zn substitution due to the dissimilar cationic radii of Ba²⁺ (1.49Å), La³⁺ (1.22Å), Fe³⁺ (0.64Å), Mn³⁺ (0.89Å) and Zn²⁺ (0.76Å) ions. The results of sample measurements with Vibrating Sample Magetometer (VSM) indicate that the magnetic behaviours showed that the saturation magnetization (M_s) increased gradually with the substitution of La³⁺, Mn³⁺ and Zn³⁺ ions, whereas the coercivity (H_c) was increase with addition of La³⁺ ions and then decrease significantly with the addition of Mn³⁺ and Zn²⁺ ions. The vector network analyzer (VNA) revealed that microwave absorption measured within 7 – 15 GHz frequency range indicated optimum reflection loss (RL) of-21.50dB at 10.5GHz for BLMZ-02 sample.

• Periodical: Key Engineering Materials (Volume 855)
• Pages: 145-153
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.855.145
• Online since: July 2020
• Authors: Didin Sahidin Winatapura*, Deswita Deswita, Ari Adi Wisnu, Setyo Purwanto, Yose Fachmi Buys
• Keywords: Absorption, Coprecipitation, Magnetic Properties, M-Type Barium Ferrites, Reflection Loss

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