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Title: Magnetic, dielectric and microwave absorption studies of Ba-CoTi hexaferrite — Epoxy composites
Authors: Singh, Praveen
Babbar, V K
Razdan, Archana
Goel, T C
Srivastava, S L
Keywords: Microwave absorption
Complex permeability
Complex permittivity
Microwave ferrite composites
Issue Date: Mar-2004
Publisher: CSIR
IPC CodeG 01N 25/00, 21/00
Abstract: The microwave absorption, complex permittivity and complex permeability studies of hexaferrite composites prepared with Ba(CoTi)xFe12-2xO19 wherein x varies from 0.0 to 1.0 in steps of 0.2 were made in frequency range from 8.0 to 12.4 GHz. The effect of Co2+Ti4+ substitution and of microstructural variation on complex permeability, permittivity and microwave absorption have been analysed. The hexaferrite-composites with x > 0.0 exhibit significant dispersion in the complex permittivity (r'- jr'') with maximum value of r'' is observed for x equal to 1.0. The dispersion in complex permeability (r'-jr'') is not significant and is attributed to the shielding effect of polymer matrix over the ferrite crystallites and to the low alternating electromagnetic field applied to the sample. The variation of reflection loss has been studied as a function of frequency (f), Co2+Ti4+content and thickness of the absorber. A maximum absorption of 16 dB (86%) is obtained for composites with x equal to 0.4 and of 2.8 mm thickness.
Page(s): 221-228
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Source:IJPAP Vol.42(03) [March 2004]

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