Characteristics of Magnetic Properties of Substituted Hexagonal Ferrites
The samples of barium hexaferrite BaFe<sub>12-2x</sub>(Me<sub>1</sub>Me<sub>2</sub>)<sub>x</sub>O<sub>19</sub> with x from 0.0 to 0.6 were prepared by variousmethods. The cationic preference of mainly divalent Me<sub>1</sub> = Z...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
VSB-Technical University of Ostrava
2006-01-01
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| Series: | Advances in Electrical and Electronic Engineering |
| Subjects: | |
| Online Access: | http://advances.utc.sk/index.php/AEEE/article/view/222 |
| Summary: | The samples of barium hexaferrite BaFe<sub>12-2x</sub>(Me<sub>1</sub>Me<sub>2</sub>)<sub>x</sub>O<sub>19</sub> with x from 0.0 to 0.6 were prepared by variousmethods. The cationic preference of mainly divalent Me<sub>1</sub> = Zn, Co, Ni, Sn ions and tetravalent Me<sub>2</sub> = Ti, Zr, Ir, Sn, Ru ionsand their combinations in substituted Ba ferrites was investigated. The substitutions were performed to reduce the grain sizeand high magnetic uniaxial anisotropy field of the M-type Ba ferrite without affecting the magnetic polarisation. The goal isto reach the properties of ferrite proper for high-density magnetic recording and microwave absorption devices. Magneticproperties were determined as a function of the substitution level x. The specific saturation magnetic polarisation Js–m andremanence Js–rincreased with small x due to the substitution of non-magnetic and less magnetic ions in 4f<sub>1</sub> and 4f<sub>2</sub> sites. Thesteep decrease of coercivity Hc with increasing x may be caused by the Co<sup>2+</sup> preference of 4f<sub>2</sub> site and Ti<sup>4+</sup>or Zr<sup>4+</sup>ions preference of 2b and slightly in 4f<sub>1</sub> sites. The temperature coefficient of the coercivity TKHc was very low (0.01kA.m<sup>-1</sup>.°C<sup>-1</sup>)for the Co-Zr substitutions and positive for the rest of samples. |
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| ISSN: | 1336-1376 1804-3119 |