Abstract
Novel middle permittivity microwave dielectric ceramic with the composition of Ba4CoTi11O27 was prepared by a solid-state reaction process. The crystal structure, sintering behavior and microwave dielectric properties of ceramics were investigated using X-ray diffraction, scanning electron microscopy and dielectric measurement. The Ba4CoTi11O27 ceramic can be well densified in the temperature range from 1125 to 1275°C. A refinement using X-ray powder diffraction data was carried out in the Rietveld method with the parameters of Ba4Ti12O27 as a starting model. Ba4CoTi11O27 has a monoclinic structure (C2/m) with lattice parameters of a=19.8525(2) Å, b=11.4616(1) Å, c=9.9052(1) Å, β=109.201(2)°, V=2128.49(3) Å3, Z=4 when the sintering temperature is 1225°C. Pure monoclinic Ba4CoTi11O27 ceramic sintered at 1225°C for 3h exhibits excellent microwave dielectric properties with εr=36.5, Q×f=15,290GHz and τf=17.3ppm/°C.
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