Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8158437 | Journal of Magnetism and Magnetic Materials | 2013 | 8 Pages |
Abstract
Nanosized barium ferrite (BaFe12O19) with Novolac phenolic resin (NPR) is developed as a magnetic absorber for application in the frequency range 8.2-12.4Â GHz. The absorption is studied by modifying the microstructural properties of the ferrite inclusion with annealing temperature and its content in the composite. Transmission electron microscopy and X-ray diffraction pattern confirms the formation of hexagonal structure of barium ferrite. The crystallite size of the barium ferrite particles is in nano-range and increases with annealing temperature. The BaFe12O19/NPR composite is prepared with different weight percentage of ferrite inclusions. The complex permittivity and complex permeability is measured at X-band and found to increase with annealing temperature and contents of ferrite inclusion. Theoretical study of reflection loss gives that 2Â mm absorber samples are showing the best results for X-band application. Reflection loss measurement of the samples shows absorption peak of â24.61Â dB at 10.26Â GHz for 30Â wt%, â28.39Â dB at 9.98Â GHz for 40Â wt% and â37.06Â dB at 9.5Â GHz for 50Â wt% of BaFe12O19 in NPR matrix.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
S. Ozah, N.S. Bhattacharyya,