Premium
Low Loss Magneto‐Dielectric Composite Ceramics Ba 3 Co 2 Fe 24 O 41 /SrTiO 3 for High‐Frequency Applications
Author(s) -
Chang Panpan,
He Li,
Wang Hong
Publication year - 2015
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/jace.13404
Subject(s) - materials science , dielectric , dissipation factor , dielectric loss , composite number , composite material , ceramic , microstructure , permittivity , relative permittivity , analytical chemistry (journal) , nuclear magnetic resonance , mineralogy , chemistry , optoelectronics , physics , chromatography
Magneto‐dielectric composite ceramics Ba 3 Co 2 Fe 24 O 41 /SrTiO 3 (Co 2 Z/ STO ) loading with high volume fraction of hexaferrite Co 2 Z ( f Co 2 Z = 60%–95%) are successfully prepared by a hybrid process. The microstructures with homogeneously dispersed constituent grains are observed in these composites. The composites loading with 60%–80% hexaferrite possess stable magneto‐dielectric properties in the frequency range from 10 MHz to 1 GHz with both low dielectric loss and magnetic loss. For the composite loading with 60% Co 2 Z, the relative permittivity is 28.08 and permeability is 4.46 (at 10 MHz), the dielectric loss tangent keeps below 0.009 within the frequency range from 10 MHz to 1 GHz. Also, it possesses a magnetic loss tangent of 0.006 and 0.144 at 50 MHz and 1 GHz, respectively, which are much lower than 0.056 and 1.242 of the single Co 2 Z phase at the same frequency. These excellent properties indicate that the low‐loss Co 2 Z/ STO composite ceramic is a new kind of multifunctional magneto‐dielectric material with potential for high‐frequency electromagnetic device applications.