Abstract
A new class of Ca2ZrSi4O12 ceramic filler is prepared through solid state ceramic route and the phase purity has been analyzed by X-ray diffraction (XRD) and laser Raman studies. The sintered Ca2ZrSi4O12 ceramics exhibit low dielectric constant, relatively high quality factor and very low temperature coefficient of resonant frequency. Silicone Rubber/Ca2ZrSi4O12 flexible microwave substrates were prepared by sigma mixing and compression molding techniques. The dispersion of the particulate filler in the silicone matrix was studied by Scanning Electron Microcopy. The composite exhibited low dielectric constant of 4.62 and relatively low loss tangent of 0.010 at 40 vol% of filler fraction in the X-band region. Theoretical modeling studies have been employed to predict the effective dielectric constant of the composites and results were compared with experimentally obtained values. The moisture absorption and coefficient of thermal expansion of the composites were also studied to ascertain their suitability for microwave substrate applications.
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