The Effect of 'Hydrogenation – Recalcination' Cycling on the Magnetic Properties of Strontium Hexaferrite

S.A. Seyyed Ebrahimi

doi:10.4028/www.scientific.net/KEM.280-283.465

Paper Titles

Effect of Iron Oxide on the Structure, Electrical and Magnetic Properties of (SiO₂-B₂O₃-Li₂O) Ionic Conducting Glass System
p.447

Characterization of LiFePO₄ Synthesized by Sol-Gel Processing
p.453

Preparation, Dielectric and Magnetic Properties of Barium-Ferrite-Containing Microcrystalline Glass Ceramic by Citrate Sol-Gel Process
p.457

Weak Ferromagnetism and Magnetoresistance in Sm_1/3 Sr_2/3 FeO_2.95
p.461

The Effect of 'Hydrogenation – Recalcination' Cycling on the Magnetic Properties of Strontium Hexaferrite
p.465

The Powder and Bulk Magnetic Properties of Strontium Hexaferrite Substituted by La and Nd
p.467

The Control of the Reactions of Strontium Hexaferrite Formation by the Molar Ratio of Precursors
p.471

Chemical Solution Deposition Growth of La_0.7Ca_0.3MnO₃ Films and their Electric Pulse Induced Resistance Change Effect
p.473

Preparation and Magnetic Properties of Y-Type Ferroxplana by Sol-Gel Method
p.477

HomeKey Engineering MaterialsKey Engineering Materials Vols. 280-283The Effect of 'Hydrogenation – Recalcination'...

The Effect of 'Hydrogenation – Recalcination' Cycling on the Magnetic Properties of Strontium Hexaferrite

Abstract:

Strontium hexaferrite powder synthesized conventionally was treated in a hydrogen atmosphere and then recalcined in air. This process had a marked effect on the microstructure and on the magnetic properties of the initial sample. The process was repeated several times and the effects investigated. The results showed that the products of the treatment prior to recalcination are Fe and Sr7Fe10O22 and this resulted in a change in magnetic properties from hard to soft. Consequent calcination, resulted in the reformation of strontium hexaferrite but now with a much finer grain size. This resulted in a significant enhancement of the coercivity. The variation of the coercivity with the number of cycles indicated a maximum value of 413 kA/m which then remained constant with subsequent cycling.

You might also be interested in these eBooks

View Preview

Info:

Periodical:

Key Engineering Materials (Volumes 280-283)

Pages:

465-466

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.280-283.465

Citation:

Cite this paper

Online since:

February 2007

Authors:

S.A. Seyyed Ebrahimi

Keywords:

Ceramic, Cycling, Hexaferrite, Hydrogenation, Magnetic, Powder, Recalcination

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

Citation:

References

[1] S.A. Seyyed Ebrahimi, A.J. Williams, N. Martinez, A. Ataie, A. Kianvash, C.B. Ponton and I.R. Harris: J. Phys. IV 7 (1997), p.325.

DOI: 10.1051/jp4:19971129

Google Scholar

[2] N. Martinez, A.J. Williams, S.A. Seyyed Ebrahimi and I.R. Harris: J. Mater. Sci. Vol. 34 (1999), p.2401.

Google Scholar

[3] S.A. Seyyed Ebrahimi: Key Eng. Mat. Vol. 224-226 (2002), p.589.

Google Scholar

[4] S.A. Seyyed Ebrahimi: Key Eng. Mat. Vol. 224-226 (2002), p.155.

Google Scholar

[5] S.A. Seyyed Ebrahimi, A. Kianvash, C.B. Ponton and I.R. Harris: J. Mater. Sci. Vol. 34 (1999), p.53.

Google Scholar

[6] S.A. Seyyed Ebrahimi, A. Kianvash, C.B. Ponton and I.R. Harris: J. Mater. Sci. Vol. 34 (1999), p.35.

Google Scholar

[7] S.A. Seyyed Ebrahimi, A. Kianvash, C.B. Ponton and I.R. Harris: Ceram. Int. 26 (2000), p.379. Fig. 4 The microstructure of the powder HTR processed for 1 time. Fig. 5 The microstructure of the powder HTR processed for 4 times.

DOI: 10.1016/s0272-8842(99)00067-x

Google Scholar