Journal of Electronic Materials

, Volume 43, Issue 2, pp 512–521 | Cite as

Effects of Heat-Treatment Temperature on the Microstructure, Electrical and Dielectric Properties of M-Type Hexaferrites

  • Ihsan Ali
  • M. U. Islam
  • M. S. Awan
  • Mukhtar Ahmad


M-type hexaferrite BaCrxGaxFe12−2xO19 (x = 0.2) powders have been synthesized by use of a sol–gel autocombustion method. The powder samples were pressed into 12-mm-diameter pellets by cold isostatic pressing at 2000 bar then heat treated at 700°C, 800°C, 900°C, and 1000°C. X-ray diffraction patterns of the powder sample heat treated at 1000°C confirmed formation of the pure M-type hexaferrite phase. The electrical resistivity at room temperature was significantly enhanced by increasing the temperature of heat treatment and approached 5.84 × 109 Ω cm for the sample heat treated at 1000°C. Dielectric constant and dielectric loss tangent decreased whereas conductivity increased with increasing applied field frequency in the range 1 MHz–3 GHz. The dielectric properties and ac conductivity were explained on the basis of space charge polarization in accordance with the Maxwell–Wagner two-layer model and Koop’s phenomenological theory. The single-phase synthesized materials may be useful for high-frequency applications, for example reduction of eddy current losses and radar absorbing waves.

Key words

Hexaferrites microstructure heat treatment dielectric properties 


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Copyright information

© TMS 2013

Authors and Affiliations

  • Ihsan Ali
    • 1
  • M. U. Islam
    • 1
  • M. S. Awan
    • 2
  • Mukhtar Ahmad
    • 1
  1. 1.Department of PhysicsBahauddin Zakariya UniversityMultanPakistan
  2. 2.Center for Micro and Nano Devices, Department of PhysicsCOMSATS Institute of Information TechnologyIslamabadPakistan

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