|
NISCAIR ONLINE PERIODICALS REPOSITORY (NOPR) >
NISCAIR PUBLICATIONS >
Research Journals >
Indian Journal of Pure & Applied Physics (IJPAP) >
IJPAP Vol.42 [2004] >
IJPAP Vol.42(03) [March 2004] >
| 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 Code: | G 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]
|
|
