Abstract
Effects of aluminum substitution for titanium on microwave dielectric properties of Ba3.75Nd9.5Ti18−zAlzO54 (z = 0–3.0) ceramics were investigated in this study. X-ray diffraction patterns of sintered samples revealed single-phase formation with an orthorhombic structure of all compositions. Scanning electron microscopy (SEM) and energy dispersive spectrometer results confirmed the substitution at b-site. A small amount of aluminum substitution into b-site lead to the decrease of relative dielectric constant (er) and temperature coefficient of resonant frequency (τf), but significantly improved the quality factor (Qf). Further aluminum substitution content of z ≥ 1.5 resulted in the drop of Qf value and restraint of Ti reduction. Excellent microwave dielectric properties with z = 1.5 sintered at 1,350 °C for 2 h in air would be obtained: er = 72.7, Qf = 13,112 GHz and τf = +5 ppm/°C. Tolerance factor, electronegativity difference, ionic polarizability and b-site bond valence were calculated to clarify the relationship between microstructure and microwave dielectric properties.
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