Abstract
BaO ⋅ Nd2O3 ⋅ 4TiO2—based ceramics were prepared by the mixed oxide route. Specimens were sintered at temperatures in the range 1200–1450∘C. Microstructures were investigated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM); microwave dielectric properties were determined at 3 GHz by the Hakki and Coleman method. Product densities were at least 95% theoretical. The addition of up to 1 wt% Al2O3 to the starting mixtures reduced the sintering temperatures by at least 100∘C. Incorporation of small levels of Al into the structure (initially Ti sites) led to an increase in Q × f values, from 6200 to 7000 GHz, a decrease in relative permittivity (e r ) from 88 to 78, and moved the temperature coefficient of resonant frequency (τ f ) towards zero. The addition of 0.5 wt% Al2O3 with 8 wt% Bi2O3 improved densification, increased both e r (to 88) and Q× f (to 8000 GHz) and moved τ f closer to zero.
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