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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 229-231Doping Effect on Crystal Structure and Magnetic...

Doping Effect on Crystal Structure and Magnetic Properties of Highly Al-Substituted Strontium Hexaferrite Nanoparticles

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Abstract:

M-type strontium hexaferrites with substitution of Fe³⁺ by Al³⁺, according to the formula SrAl_xFe12_-xO₁₉ (x=0, 1, 2, 3, 4, 6, 8, 10), are prepared by the sol-gel auto-combustion method. Influences of the substituted amount of Al³⁺ on structure and magnetic properties of SrAl_xFe12_-xO₁₉ compounds have systematically been investigated by XRD, TEM and VSM. X-ray diffraction shows that the samples are single M-type hexagonal ferrites. Because of the resemblance of Al³⁺ ionic radii with Fe³⁺ the two ions are easily replaced at any substitution ratio without changing the crystal structure. The materials show structural and morphology changes upon replacement of iron by aluminum. A shift in peak position to larger angles shown by XRD is observable with increasing aluminum doping. The values of Ms, Mr and Hc decrease with the addition of Al content but there is an exception for x=3 when H_c=8.9 KO_e.

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Mechanical and Electrical Technology IV

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Periodical:

Applied Mechanics and Materials (Volumes 229-231)

Pages:

210-214

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.229-231.210

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Online since:

November 2012

Authors:

Elham Khorashadizade, Hadi Arabi, Abbas Yousefi

Keywords:

Al Substitution, Magnetic Nanoparticles, Sol-Gel Auto-Combustion, Strontium Hexaferrite

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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