Abstract
Effect of Li2O–Al2O3–B2O3 (LAB) doping on sintering behavior, microstructure and microwave dielectric properties of Ba6−3x (Sm1−y , Nd y )8+2x Ti18O54 + 2TiO2 (x = 2/3 and y = 0.5; BSNTT) ceramics were investigated. The BSNTT ceramics doped with 2 wt.% LAB significantly lowered the sintering temperature by 250 °C compared to un-doped BSNTT (at 1,300 °C) without a serious degradation of the microwave dielectric properties. As the small amount of LAB content increased, the small amount of liquid phase increase in an amorphous state around the surface of the grain boundaries without secondary phase formation as observed in the X-ray diffraction and energy dispersive spectroscopy results. With increasing the content of LAB glass, both of dielectric constant (e r ) and quality factor (Q × f) value decreased. Typically, the BSNTT + 2 wt.% LAB ceramic which were well sintered at 1,050 °C for 3 h showed optimal microwave dielectric properties of: e r = 61.1, Q × f = 5,856 GHz and τ f = +16.75 ppm/°C.
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