Optimized dual-function varistor-capacitor ceramics of core-shell structured xBi2/3Cu3Ti4O12/(1-x)CaCu3Ti4O12 composites |
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| Affiliation: | 1. College of Electrical and Information Engineering, Hunan University, 2 Lushan South Road, Changsha, 410082, Hunan, China;2. State Key Laboratory of Electrical Insulation and Power Equipment, Xi`an Jiaotong University, 28 Xianning West Road, Xi`an, 710049, Shaanxi, China;1. Physical Chemistry Department, Chemistry Institute, São Paulo State University (UNESP), Araraquara, São Paulo, Brazil;2. São Paulo State University (UNESP), Faculty of Engineering of Guaratinguetá, Av. Dr. Ariberto Pereira da Cunha 333, Portal das Colinas, 12.516-410, Guaratinguetá, São Paulo, Brazil;3. Center for Natural and Human Sciences (CCNH), Federal University of ABC (UFABC), Santo André, São Paulo, Brazil;1. School of Physics & Materials Science, Thapar Institute of Engineering & Technology, Patiala 147004, India;2. CSIR-National Physical Laboratory, New Delhi 110012, India;3. Thin Film Group, CSIR-CSIO, Chandigarh 160030, India |
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| Abstract: | xBi2/3Cu3Ti4O12/(1-x)CaCu3Ti4O12 composites were prepared by traditional solid-state reaction method. Extremely high nonlinear coefficient of 25 and breakdown field of 18.92 kV·cm?1 were obtained in small current range of 0.1?1 mA·cm-2. In addition, reduced dielectric loss of 0.055 was achieved with high dielectric constant of 1369. Optimized nonlinear and dielectric properties were integrated to make the composites a promising dual-function varistor-capacitor candidate. Microstructure analysis discovered two areas with various Bi/Ca ratio, designated as Bi-H and Bi-L respectively. It was found that the maximum ratio of Bi-H/Bi-L heterogeneous interface corresponded to optimized nonlinear and dielectric performance, which was associated with elevated potential barrier height and huge grain boundary resistance. Combined with relaxation analysis, a core-shell structure was proposed to elaborate microstructure evolution in xBi2/3Cu3Ti4O12/(1-x)CaCu3Ti4O12 composite. According to the core-shell model, variation of heterogeneous interface was illustrated on how to influence nonlinear properties, which was well fitted to experimental results. |
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| Keywords: | CCTO composites Varistor-capacitor Relaxations Grain boundary Heterogeneous interface |
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