电子元件与材料2026，Vol.45Issue(8)：907-918,12.DOI:10.14106/j.cnki.1001-2028.2026.0027
四元取代CaCu3Ti4O12 陶瓷的介电性能及其机理研究
Dielectric properties and mechanism of quaternary-substituted CaCu3Ti4O12 ceramics
摘要
Abstract
To address the problems of high dielectric loss(tanδ),limited temperature stability,and the performance bottleneck associated with single and binary-element substitution in CaCu3Ti4O12 ceramics,a Mg/Zn/Al/Nb quaternary substitution system was constructed.CaCu2.95-xMgxZn0.05Ti3.92(AlNb)0.04O12(x=0.05,0.07,0.09)ceramics were synthesized by the sol-gel method,and the synergistic effects of multi-element substitution on phase structure,microstructure,and dielectric properties were systematically investigated.The results showed that all samples exhibited a cubic perovskite structure without detectable secondary phases,and the doped elements were successfully incorporated into the lattice with stable valence states.Appropriate Mg doping significantly promoted grain growth and improved densification.When x=0.07,the ceramic exhibited the optimal overall performance,achieving a dielectric constant(ε′)of 49397 and a tanδ of 0.024 at 1 kHz,a breakdown electric field of 880 V·cm-1,and capacitance variation within±15％in the temperature range of-55℃ to 125℃.Impedance spectroscopy analysis indicated that this composition exhibited relatively high grain boundary resistance and grain boundary activation energy.X-ray photoelectron spectroscopy results further demonstrated that quaternary substitution increased the contents of Cu+,Ti3+,and oxygen vacancies,thereby enhanced interfacial polarization and increased the grain boundary barrier height,which allowed the simultaneous optimization of high ε′,low tanδ,and satisfactory temperature stability.These findings provide experimental evidence and theoretical insights for the multi-element substitution engineering of perovskite dielectric materials.关键词
CaCu3Ti4O12/四元共取代/介电常数/介电损耗/温度稳定性Key words
CaCu3Ti4O12/quaternary substitution/dielectric constant/dielectric loss/temperature stability分类
信息技术与安全科学引用本文复制引用
常烜玮,张建花,刘东东,雷波,吝伶艳..四元取代CaCu3Ti4O12 陶瓷的介电性能及其机理研究[J].电子元件与材料,2026,45(8):907-918,12.基金项目
国家自然科学基金(51701136,51977137) （51701136,51977137）
山西省自然科学基金(202303021221044) （202303021221044）
