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Journal of Materials Science

, Volume 41, Issue 21, pp 7190–7196 | Cite as

Dielectric constant, magnetic permeability and microwave absorption studies of hot-pressed Ba-CoTi hexaferrite composites in X-band

  • Praveen Singh
  • V. K. Babbar
  • Archana Razdan
  • S. L. Srivastava
  • V. K. Agrawal
  • T. C. Goel
Article

Abstract

The microwave absorption, complex permittivity and complex permeability studies of hot-pressed hexaferrite composites prepared with Ba(CoTi)xFe12-2xO19 (x = 0.0, 0.2, 0.4, 0.8, and 1.0) were made in the frequency range from 8.0 to 12.4 GHz. The hexaferrite composites with x > 0.0 exhibit significant dispersion in the complex permittivity (εr′-jεr″). However the dispersion in complex permeability (μr′-jμr″) is not significant and is attributed to the shielding effect of polymer matrix over the ferrite crystallites. The reflection loss has been studied as function of frequency, composition and thickness of absorber. A comparison of reflection loss of hot-pressed ferrite composites with that of normal sintered ferrite composites was made and analyzed. A minimum reflection loss of—24.0 dB is obtained at 9.9 GHz for 2.8 mm thick sample of BaCo0.4Ti0.4Fe11.2O19 hot-pressed hexaferrite composite.

Keywords

Ferrite Microwave Absorption Reflection Loss Magnetic Loss Barium Ferrite 

Notes

Acknowledgements

The author (PS) would like to thank Dr. R. K. Puri, former professor, Department of physics, I.I.T. Delhi, New Delhi for his guidance and support in this work. Thanks are also due to Mr. Vipitya Katiyar, Department of physics, Allahabad University for his help at measurement stage on MNA Model HP 8510B.

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Copyright information

© Springer Science+Business Media, LLC 2006

Authors and Affiliations

  • Praveen Singh
    • 1
    • 5
  • V. K. Babbar
    • 2
    • 6
  • Archana Razdan
    • 2
  • S. L. Srivastava
    • 3
  • V. K. Agrawal
    • 3
  • T. C. Goel
    • 4
  1. 1.Biophysics & Electron Microscopy Section, IVRIIzatnagarIndia
  2. 2.Department of Applied PhysicsG.N.D. UniversityAmritsarIndia
  3. 3.M.N. Saha Centre for Space StudiesUniversity of AllahabadAllahabadIndia
  4. 4.Birla Institute of Technology-PilaniZuarinagarIndia
  5. 5.Department of Electronics, Graduate School of Information Science and Electrical EngineeringKyushu UniversityFukuokaJapan
  6. 6.Physics DepartmentQueen’s UniversityKingstonCanada

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