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Serletis, C.
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article
Structural and magnetic properties of barium-gadolinium hexaferrites
Abstract
<p>A series of Gd-substituted M-type barium hexaferrites has been prepared by the ceramic route, according to the formula (Ba<sub>1-x</sub>Gd<sub>x</sub>)O·5.25Fe<sub>2</sub>O<sub>3</sub> (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 (Fe<sub>2</sub>O<sub>3</sub>) and GdFeO<sub>3</sub> were detected in the remaining samples. Coercivity (H<sub>c</sub>) 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 (σ<sub>sat</sub>) 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.</p>