Abstract
A spherical filler of Ca0.65Sr0.35TiO3 dielectric oxide was prepared by flame fusion to improve the fluidity of ceramic-polymer compounds. The dielectric permittivity of the powder decreased by about 20% after melting-spheroidization but recovered after being heat-treated above 1150°C for 4 h. Composite dielectrics made from the spherical powder and a thermosetting polymer exhibited lower viscosity before hardening, thus making it possible to increase the filler concentration by over 5 vol %. A dielectric permittivity between 12 and 19 was achieved by adjusting the filler concentration of the spherical powder in the range of 40–70 vol %.
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