Boosting effective capacitance of nanograined BaTiO 3-based ceramics via a precise core-shell-structure optimization strategy
Journal of Alloys and Compounds(2024)
摘要
The continued miniaturization of multilayer ceramic capacitors (MLCCs) means that thinner dielectric layers are exposed to stronger electric fields, degrading their capacitance. Thus, improving the DC-bias stability is urgent to maintain capacitance under strong electric fields and satisfy the requirements of high-end MLCCs. This work proposes a strategy for optimizing the DC-bias performance by tuning the core-shell structure of ceramics. Both numerical and experimental results indicate that the DC-bias performance of core-shell-structure ceramics can be significantly optimized under the double action of thickening the shell and increasing the shell dielectric constant, which simultaneously achieves considerable dielectric constant under DC-bias. Dy-Mg co-doped BaTiO 3 - based ceramics with an average grain size of about 180 nm prove extremely DC-bias stability and have a high dielectric constant of about 2000 and a low DC-bias attenuation coefficient of -23.6% at 4 kV/mm, which guarantees a high effective capacitance, especially under high electric fields.
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关键词
Effective capacitance,Core-shell structure,Nanograin BaTiO 3,Finite element method,Phase-field model
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