期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 320, 期 10, 页码 1657-1665出版社
ELSEVIER
DOI: 10.1016/j.jmmm.2007.11.002
关键词
ferrites; permeability; permittivity
M-type hexagonal ferrite composition, Ba(1-x)SrxFe12O19 (x = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0), was prepared by a two route ceramic method. Complex permittivity (epsilon'-j epsilon '') and complex permeability (mu'-j mu '') have been measured using a network analyzer from 8.2 to 12.4GHz X-ray diffraction confirmed the M-type hexagonal structure and a scanned electron micrograph was used to analyze the grain size distribution of ferrite. Substitution of Sr2+ ions causes an increase in porosity that deteriorates the electromagnetic and microstructural properties in the doped samples. Both dielectric constant and dielectric loss are enhanced in comparison to the permeability and magnetic loss over the entire frequency region. This is due to a resistivity variation and the formation of Fe2+ ions, which increases the hopping mechanism between Fe2+ and Fe3+ ions. (c) 2007 Elsevier B.V. All rights reserved.
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