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Enhancement in physical properties of barium hexaferrite with substitution

Published online by Cambridge University Press:  25 August 2015

Talwinder Kaur ,
Sachin Kumar ,
Bilal H. Bhat  and
Ajeet Kumar Srivastava
Talwinder Kaur
Affiliation:
Department of Physics, Lovely Professional University, Phagwara, Punjab 144411, India
Sachin Kumar
Affiliation:
Department of Chemistry, Guru Nanak Dev University, Amritsar, Punjab 143005, India
Bilal H. Bhat
Affiliation:
Department of Physics, University of Kashmir, Kashmir 190006, India
Ajeet Kumar Srivastava*
Affiliation:
Department of Physics, Lovely Professional University, Phagwara, Punjab 144411, India
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

M-type barium hexaferrite powders were synthesized using modified Pechini sol gel auto combustion method. The powder samples were heat treated at 900 °C for 5 h and were subjected to the structural, thermal, dielectric, magnetic, and optical studies. X-ray powder diffraction patterns show the formation of pure phase of M-type hexaferrite. Thermal analysis reveals that the weight loss of precursor becomes constant after 680 °C. The presence of two prominent peaks near 430 and 580 cm−1 in Fourier transform infrared spectroscopy spectra indicates the formation of M-type hexaferrites. The M–H curve has been used to study the magnetic behavior. The maximum value of coercivity is found for x = 0.41, which is higher than that of the pure barium hexaferrite. The band gap dependency on composition was studied using UV–Vis NIR spectroscopy. It was found that the dielectric constant is high at low frequency and decreases with an increase in frequency. Hexagonal structure of hexaferrite is visualized in transmission electron images.

Keywords

nanostructureoptical propertiesmagnetic properties
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 18 , 28 September 2015 , pp. 2753 - 2762
Copyright
Copyright © Materials Research Society 2015 

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References

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