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The Effect of Sr Substitution on Phase Formation and Magnetic Properties of Y‐type Hexagonal Ferrite
Author(s) -
Bai Yang,
Zhou Ji,
Gui Zhilun,
Li Longtu
Publication year - 2005
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2005.00080.x
Subject(s) - materials science , microstructure , ionic radius , ferrite (magnet) , analytical chemistry (journal) , hexagonal phase , scanning electron microscope , ion , diffraction , crystallography , hexagonal crystal system , chemistry , metallurgy , composite material , physics , organic chemistry , chromatography , optics
The effect of Sr substitution in Y‐type hexagonal ferrite of composition Ba 2– x Sr x Zn 1.2 Co 0.4 Cu 0.4 Fe 12 O 22 was investigated. x varied from 0 to 2.0. The samples were prepared by the solid‐state reaction method. Phase formation was characterized by powder X‐ray diffraction. The microstructure was observed via scanning electron microscopy and magnetic properties were measured using an impedance analyzer and vibrating sample magnetometer (VSM). Results reveal that Sr 2+ cannot completely substitute for Ba 2+ ions in Y‐type hexagonal ferrites. The maximum solubility of Sr in the Y‐type ferrite is about 1.8. With Sr above 1.8, the lattice mismatch induced by the difference in ionic radii of Ba 2+ and Sr 2+ ions prevents the formation of Y‐type phase. While Sr content is equal or less than 1.0, the magnetic properties may be enhanced. As x >1.0, because of the internal stress resulting from the lattice mismatch, demagnetizing field significantly degrades initial permeability.