Nanosized barium ferrite (BaFe₁₂O₁₉) powders are synthesized using co-precipitation technique at three different annealing temperatures. The X-Ray Diffraction pattern indicates the presence of hexagonal structure for all the three samples. Transmission electron microscopy (TEM) shows the particles are hexagonal in shape. The synthesized BaFe₁₂O₁₉ powder samples are mechanically mixed with Novolac phenolic resin (NPR) with filler to polymer weight ratio of 30:60 to prepare pellets of BaFe₁₂O₁₉/NPR composites of dimensions, 10.38 mm x 22.94 mm x 4 mm. The complex permittivity, ε_r and complex permeability, μ_r of the developed samples are measured at X-band by Nicolson-Ross method using Agilent E8362C vector network analyzer. The effect of the annealing temperature on the complex permittivity and permeability in the X-band is studied. The maximum dielectric constant and permeability is obtained of the BaFe₁₂O₁₉/NPR composite with BaFe₁₂O₁₉ annealed at 900⁰C as 6 and 2 respectively. The composite is a good candidate for microwave absorption study.

Date Published: 28 January 2013
PDF: 7 pages
Proc. SPIE 8760, International Conference on Communication and Electronics System Design, 87600Q (28 January 2013); doi: 10.1117/12.2010423

Published in SPIE Proceedings Vol. 8760:
International Conference on Communication and Electronics System Design
Vijay Janyani; M. Salim; K. K. Sharma, Editor(s)