Microwave Absorption of BaLa_0.5Fe_11.5O₁₉/SiO₂ Nano-Powders

Abstract:

Nano-size BaM hexaferrites (BaLa0.5Fe11.5O19) were synthesized in the presence of SiO2 nano- particles by sol-gel method. The X-ray diffraction (XRD) patterns of ferrites annealed at above 900°C manifested that all the species had hexagonal crystal structure and no diffraction peaks of SiO2 found. Compared with BaLa0.5Fe11.5O19 powders, those synthesized in the presence of SiO2 nano-particles presented in smaller powder size, as proved by scanning electron microscopy (SEM). As a result, SiO2 nanoparticles promoted the formation of more homogeneous and finer ferrite crystal while the structure of hexaferrites consisted with that synthesized without SiO2 nano-particles. Microwave absorbing properties were evaluated. As a result, BaLa0.5Fe11.5O19/SiO2 showed good microwave absorbing properties with the maximum absorption more than 20dB.

• Periodical: Advanced Materials Research (Volumes 105-106)
• Pages: 380-382
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.105-106.380
• Online since: April 2010
• Authors: Zhi Dong Han, Qing Rui Zhao, Li Min Dong, Ze Wu, Xian You Zhang
• Keywords: Hexaferrite, Microwave Absorption, Nanoparticle, SiO₂, Sol-Gel (SG)

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