Structural, Magnetic and Microwave Absorption Characteristics of Ba_1-xLa_xFe₁₂O₁₉ (x = 0; 0.1; 0.2;0.3;0.5;0.7)

Abstract:

In this study, effect of La substitution on the microstructure, magnetic properties and microwave absorption characteristics of Ba_1-xLa_xFe₁₂O₁₉ (x=0, 0.1, 0.2, 0.3, 0.5, 0.7) is reported. The samples were synthesized through mechanical alloying and solid reaction a temperature 1200 °C for 2 hours. A single-phase material occurred only at x = 0 and 0.1. Additional second phases were existing in all samples with x ≥ 0.2 which led to multi-phase materials. The single phase (x = 0 and 0.1) has a relatively uniform particle size distribution with a mean crystallite size 138 nm. Additional phases of respectively Fe₂O₃ and LaFe₂O₃ were identified in all samples with x ≥ 0.2. Effect of La substitution is to decrease the magneto crystalline anisotropy constant and the saturation magnetization. The latter is due to a decrease in mass fraction of the main magnetic phase. All Ba_1-xLa_xFe₁₂O₁₉ samples have superior microwave characteristics which able to absorb more than 99 % the incoming electromagnetic wave entering the material. The absorption bandwidth is found relatively wide within the frequency range 8-12 GHz.

• Periodical: Key Engineering Materials (Volume 855)
• Pages: 261-267
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.855.261
• Online since: July 2020
• Authors: Yana Taryana, Ari Adi Wisnu, D. Mahmudin, Yuyu Wahyu, Azwar Manaf*
• Keywords: Barium Hexaferrite, Crystal Structure, La Substitutes, Magnetic Properties, Microwave Absorption, Particle Size Distribution, Reflection Loss

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