Investigation of low-temperature formation and microwave properties of BaFe₁₂O₁₉ microcrystalline glass ceramic by citrate sol-gel process

Abstract

BaFe₁₂O₁₉/SiO₂ and BaFe₁₂O₁₉/B₂O₃-SiO₂-K₂O microcrystalline glass ceramics were prepared at 1100 °C and 850 °C, respectively, by citrate sol-gel process. The complex dielectric constant and complex permeability were measured in the range of 100MH_z-6 GH_z. The real part of dielectric constant and permeability decreased with increase of frequency and an obvious resonance peak is observed in ϵ” ˜f curves, with a maximum dielectric loss of about 0.40 for BaFe₁₂O₁₉/SiO₂ microcrystalline glass ceramic. The real part of permeability decreased with frequency for BaFe₁₂O₁₉/B₂O₃-SiO₂-K₂O microcrystalline glass ceramics, however, its complex permittivity, imaginary part of permeability, dielectric loss and magnetic loss showed no significant variation in the whole range of measuring frequency.

Keywords:

• BaFe₁₂O₁₉/SiO₂
• BaFe₁₂O₁₉/B₂O₃-SiO₂-K₂O
• Microwave properties
• Microcrystalline glass ceramic
• Sol-gel