Please use this identifier to cite or link to this item:
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)
Appears in Collections:IJPAP Vol.42(03) [March 2004]

Files in This Item:
File Description SizeFormat 
IJPAP 42(3) 221-228.pdf640.41 kBAdobe PDFView/Open

Items in NOPR are protected by copyright, with all rights reserved, unless otherwise indicated.