Cofiring characteristics and dielectric properties for dielectric composites with macroscopic inhomogeneity and X7R characteristics

A multilayer dielectric composite with a compositional gradient and tempera ture-stable characteristic was successfully prepared through the convention al tape casting technique. The cofiring behaviors and dielectric properties of the composite were investigated. It was shown that processing parameter s not only affected the physical integrity of the composites. but also alte red their final dielectric properties. The processing sensitivity was attri buted to the interfacial interdiffusion and mismatched sintering shrinkage. Microstructural observation and compositional analysis indicated that the sintered dielectric composite had macroscopic inhomogeneity and layer-like structure. By suitable structural and processing designs, the X7R EIA speci fication of the composite was obtained, together with low-sintering tempera ture and high dielectric constant. (C) 2001 Published by Elsevier Science L td. All rights reserved.