Abstract
Effects of powder properties of the filler, including the particle size, the specific surface area and the lattice strain, on the dielectric permittivity and Q of ceramics-polymer composites have been investigated in order to achieve composites with high ε and Q.
Ca0.65Sr0.35TiO3 was chosen as the material of the ceramics dielectric filler for its high ε and Q at maicrowave frequencies. Dielectric fillers of Ca0.65Sr0.35TiO3 with various particle sizes, specific surface areas, and lattice strains were prepared.
The ceramics-polymer composites were prepared using these fillers, and the dielectric properties of the composites were evaluated at 2 GHz. The dielectric properties of the composites were strongly influenced by the powder properties of the filler, despite that the fillers have the same composition. Generally, lower specific surface area and lower lattice strain of the filler lead to higher ε and Q of the composites.
