Volume 3, No. 3, September, 2015
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Permittivity and Permeability of Polycrystalline Ba(CoZr)xFe12–2xO19 and Their Composite Thick Films at RF and Microwave Frequencies

Mukesh C. Dimri 1 and D. C. Dube 1
1. Jaypee University Anoopshahr, Anoopshahr-203390, Bulandshahr, India
2. Department of EECE, ITM University, Gurgaon 122017, India
Abstract: In this paper the effect of Co-Zr substitution on permittivity and permeability of polycrystalline M-type hexaferrite (Ba(CoZr)xFe12–2xO19 with 0 ≤ x ≤ 0.5) and their composite thick films was investigated at RF and microwave frequencies ( X- band). Enhanced sintering temperatures as well as higher Co-Zr concentration in the polycrystalline Ba(CoZr)xFe12–2xO19 samples resulted in enhancement in the complex permittivity. This rise in permittivity is understandable in ferrites due to increased concentration of easily polarizable Fe2+ ions in the high temperature sintered samples. Co-Zr substitution resulted in grain growth, enhancement in electrical conductivity and enhanced dielectric parameters. Permeability of these samples, measured at X-band frequencies by cavity perturbation technique, was found to be decreasing on Co-Zr substitution, because of substitution of magnetic Fe ions by nonmagnetic Zr ions. However the complex permittivity don’t show remarkable change within X-band frequency range. The permittivity values of thick films were expectedly found to be less as compared to corresponding bulk materials both at low and microwave frequencies. Temperature dependence of dielectric properties of these ferrite-composite thick films also infers that these films can be useful up to a temperature of 200°C without material degradation.
Key Words: M-type hexaferrites, complex permittivity and permeability, composite thick films

Cite: Mukesh C. Dimri and D. C. Dube, "Permittivity and Permeability of Polycrystalline Ba(CoZr)xFe12–2xO19 and Their Composite Thick Films at RF and Microwave Frequencies," International Journal of Materials Science and Engineering, Vol. 3, No. 3, pp. 208-218 September 2015. doi: 10.17706/ijmse.2015.3.3.208-218

General Information

ISSN: 2315-4527 (Print)
Abbreviated Title: Int. J. Mater. Sci. Eng.
Editor-in-Chief: Prof. Emeritus Dato' Dr. Muhammad Yahaya
DOI: 10.17706/ijmse
Abstracting/ Indexing: Ulrich's Periodicals Directory, Google Scholar, Crossref
E-mail: ijmse@iap.org