Complex permittivity, permeability, and X-band microwave absorption of CaCoTi ferrite composites

Autor:	Archana Razdan, V. K. Babbar, T. C. Goel, R. K. Puri, Praveen Singh
Rok vydání:	2000
Předmět:	Permittivity Solution map Materials science Permeability (electromagnetism) Reflection loss Analytical chemistry X band General Physics and Astronomy Relative permittivity Ferrite (magnet) Composite material Microwave
Zdroj:	Journal of Applied Physics. 87:4362-4366
ISSN:	1089-7550 0021-8979
Popis:	The effect of Co2+Ti4+ substitution on complex permeability, permittivity, and microwave absorption has been studied for [Ca(CoTi)xFe12−2xO19]96.0[La2O3]4.0 ferrite-epoxy composites, wherein x varies from 0 to 1.0 in steps of 0.2, in the frequency range from 8.0 to 12.4 GHz. The ferrites with x>0 exhibit significant dispersion in complex permittivity (e′−je″) with the maximum value of e″ observed for x equal to 0.2. The dispersion in complex permeability (μ′−jμ″) is not significant. The variations of reflection loss and percentage absorption have been studied as a function of frequency, Co2+Ti4+ content, and thickness of the absorber. A maximum reflection loss of 31.0 dB is obtained for composites with x equal to 0.2 and absorber thickness of 2.5 mm. The experimental values of the matching frequency and the matching thickness agree well with the theoretical values obtained from an impedance-matching solution map.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5ea78bec40e8d727e46b6dc269833076 https://doi.org/10.1063/1.373079 Zobrazit plný text záznamu