Broadband microwave magnetic and dielectric properties of (Mg0·6Cd0·4Co0·05Fe1·95O4)1-x+(MgTi2O4)x with x contents of 0.00, 0.06, 0.12, and 0.18 composites with low loss for high-frequency antennae

Abstract

Two phase-based composites consisting of magnetic Mg0·6Cd0·4Co0·05Fe1·95O4 ferrite and dielectric magnesium titanate (MgTi2O4) were synthesized through a solid-state route. The structural and high-frequency magneto-dielectric properties of a series of (Mg0·6Cd0·4Co0·05Fe1·95O4)1-x+(MgTi2O4)x with x contents of 0.00, 0.06, 0.12, and 0.18 were studied. The phase structure was examined via X-ray diffraction (XRD), the results indicated the occurrence of both spinel MgTi2O4 and MgFe2O4 phases in various composites. Meanwhile, grain size and bulk density were lowered with the introduction of MgTi2O4, which also significantly weakened magnetic properties with decreased saturation magnetization (Ms) from 43.05 emu/g to 20 emu/g and coercivity (Hc) from 67.02 Oe to 3.35 Oe. In addition, the real permeability (μʹ) decreased and permittivity (ε′) increased with increasing MgTi2O4 content over the wide frequency range of 0.5–5 GHz. Finally, a low order of magnitude (tan δμ ≈ 10−1 to 10−2 and tan δε ≈ 10−2 to 10−3) was obtained for all composites. These results demonstrated that the synthesized composites were expected to be an ideal candidate for high-frequency antenna loading materials.

Keywords

• Mg0·6Cd0·4Co0·05Fe1·95O4/MgTi2O4 composites
• Magnetic and dielectric properties
• High-frequency antenna
• Low loss