Abstract
A fine-grained Yb-doped (Ba1-xCax)mTiO3 (BCT)-based ceramic, possessing high dielectric properties and outstanding reliability under a reducing atmosphere sintering, was synthesized by the chemical coating method. The mean grain size of the ceramics was 170 nm. A distinct core-shell structure of ceramics was observed by the TEM-EDS measurement. With increasing content of Yb, the curie temperature increased and the DC-bias capacitance change rate decreased under a DC field at 40 kV/cm. The optimal component showed a dielectric constant of 2200 and met the requirement of the X8R MLCCs application. Moreover, the outstanding highly accelerated life-time and higher grain boundary activation energy substantiated that Yb dopant prominently improved the reliability of dielectric materials of MLCCs. All these studies provide meaningful recommendations for the research on dielectric materials of high-performance, high-reliability base-metal MLCCs.
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