Abstract
A series of Gd-substituted M-type barium hexaferrites has been prepared by the ceramic route, according to the formula (Ba1-xGdx)O·5.25Fe2O3 (x = 0 - 0.30). XRD analysis revealed that all the samples present primarily an M-type structure. Samples x = 0 and x = 0.05 are single-phase. Hematite (Fe2O3) and GdFeO3 were detected in the remaining samples. Coercivity (Hc) shows remarkably high values, ∼293 kA/m for x = 0.20 and 0.30 with a maximum of 322 kA/m for x = 0.25. Specific saturation magnetization (σsat) of the samples presents a small increase up to x = 0.10. The microstructure examination indicates that Gd may act as a grain growth inhibitor.
Original language | English |
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Pages (from-to) | e884-e886 |
Journal | Journal of Magnetism and Magnetic Materials |
Volume | 310 |
Issue number | 2 SUPPL. PART 3 |
DOIs | |
Publication status | Published - Mar 2007 |
Externally published | Yes |
Keywords
- M-type hexaferrites
- Magnetic properties
- Permanent magnets
- Rare earth substitution