Effect of Mg on the dielectric and electrical properties of BaTiO3-based ceramics
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BaTiO3-based dielectric ceramics with grain sizes of 100–120 nm were prepared by the chemical coating approach and are promising for the application of ultrathin multilayer ceramic capacitors. The doping effects of Mg on the microstructures and dielectric properties of the BaTiO3-based ceramics were investigated. The addition of Mg was beneficial for inhibiting the grain growth and improving sintering characteristics and improving the dielectric properties and reliability of the nano-BaTiO3-based ceramics. The highly accelerated lifetime test and thermally stimulated depolarization current were employed to study the resistance degradation and conduction mechanism of the Mg-doped BaTiO3 ceramics. It was determined that the reliability characteristics greatly depended on the Mg content. The addition of 2 mol% Mg was suitable for improving the reliability of the nano-BaTiO3-based ceramics, which is an important parameter for the application of multilayer ceramic capacitors. However, further increasing the addition amount of Mg decreased the performance of the BaTiO3-based ceramics.
KeywordsBaTiO3 Polarization Temperature Thermally Stimulate Depolarization Current Oxygen Vacancy Concentration BaTiO3 Ceramic
The work was supported by the Ministry of Sciences and Technology of China through the National Basic Research Program of China (973 Program 2015CB654604), the National Natural Science Foundation of China for Creative Research Groups (Grant No. 51221291) and the National Natural Science Foundation of China (Grant No. 51272123) and was also supported by CBMI Construction Co., Ltd.
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