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Influence of Al Substitution on Structural, Dielectric and Magnetic Properties of M-type Barium Hexaferrite

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Abstract

Polycrystalline Al-substituted BaFe12O19 samples were synthesized and investigated in order to study their structural, dielectric, and magnetic properties. Analysis of powder X-ray diffractions by Rietveld refinement shows the single-phase nature of samples with hexagonal structure. The magnetic properties of the samples were investigated by measuring temperature and field variations of magnetization using vibrating sample magnetometer. The temperature variation of magnetization measurement shows that all samples exhibit ferrimagnetic transition, and the transition temperature is found to decrease from 720 K for x = 0 to 709 K for x = 0.08. The saturation magnetization value at room temperature is found to decrease with increase in Al concentration, and on the other hand, the coercivity is found to increase. The dielectric spectrum of pure and Al-doped samples shows the typical exponential fall in dielectric constant with increase in frequency. The magnitude of dielectric constant at 100 Hz falls from 2000 for x = 0 to 400 for x = 0.10. The permeability spectrum of Al-doped samples is found to be almost independent of frequency for f>100 MHz.

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Acknowledgments

Authors are thankful to CSIR, New Delhi (grant no. 03(1253)/12/EMR-II), UGC-DAE-CSR, Mumbai (grant no. UDCSR/MUM/CD/CRSM-192) and DAE BRNS (37(1)/14/33/2015/BRNS) for financial support.

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  1. Department of Physics, Indian Institute of Technology Guwahati, Guwahati, 781039, India

    Pratap Behera & S. Ravi

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Behera, P., Ravi, S. Influence of Al Substitution on Structural, Dielectric and Magnetic Properties of M-type Barium Hexaferrite. J Supercond Nov Magn 30, 1453–1461 (2017). https://doi.org/10.1007/s10948-016-3924-1

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