Abstract
BaFe12−xAlxO19 (0≤x 0≤2.5) powders and thick films were prepared by solid state synthesis method and screen printing technique respectively. X-ray diffraction confirmed the single phase without any impurity phase. Bond length calculation from FTIR spectra suggested the occupation of Al3+ ions at octahedral and tetrahedral sites. Magnetic measurements showed that coercivity (Hc), saturation magnetization (Ms) and anisotropic field (Ha) strongly depends on the substitution amount. As compared to the powder, substituted thick films possess higher Hc despite its larger grain size. M-T measurement showed a decrease in Curie temperature from ∼497°C (x=0.0) to ∼437°C (x=2.0). High dielectric constant (εr) and low losses (tanδ) were observed in Al3+ substituted samples. However, εr decrease and tanδ increase with temperature. Scanning electron micrographs showed that Al3+ substitution promotes hexagonal shaped grains in sintered thick films. Complex permeability behavior in X-band frequency is also investigated and found to be less in Al-substituted samples. Reflection losses are increased with Al3+ substitution and found maximum (−47dB at 9.3GHz) for x=1.5.
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