Low-Temperature Sintering and Enhanced Dielectric Properties of BaZr0.2Ti0.8O3-Based Y5V Ceramics with Li2CO3 to Reduce the Sintering Temperature
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We synthesized BaTi0.8Zr0.2O3 (BZT)-based powders using the sol–gel method, and introduced Li2CO3 with a low melting point (723°C) as a source of the liquid phase to reduce the sintering temperature (Ts) and improve the dielectric properties of the BZT-based ceramics. The x-ray powder diffractometer patterns exhibited a perovskite structure in all samples. The scanning electron microscope images revealed that the sinterability of the BZT-based ceramics was improved by adding an appropriate amount (3.0 wt.%) of Li2CO3; Ts decreased from 1280°C to 1100°C. The BZT-based ceramics sintered at 1100°C with 3.0 wt.% Li2CO3 met the Y5V requirements, with good electrical properties: εmax = 17987, εr = 15950, and tan δ = 0.02. The results indicated that Li2CO3 can improve the dielectric properties and reduce the Ts of BZT-based ceramics. Our method therefore represents a less expensive approach for developing materials suitable for use in multilayer capacitors.
KeywordsSintering temperature density dielectric properties sol–gel method
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We thank the Shaanxi Province Natural Science Foundation Research Project (Grant No. 2016JZ006), the Key Laboratory of Se-enriched Products Development and Quality Control, Ministry of Agriculture and Rural Affairs/National-Local Joint Engineering Laboratory of Se-enriched Food Development (Grant No. Se-2018B06), and the Shaanxi Light Optoelectronics Material Co., Ltd. (No. 2015610002001920) for funding our research.