High Breakdown Field CaCu 3 Ti 4 O 12 Ceramics: Roles of the Secondary Phase and of Sr Doping

Zhuang Tang, Kangning Wu, Yuwei Huang and Jianying Li
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Zhuang Tang: State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, China
Kangning Wu: State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, China
Yuwei Huang: State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, China
Jianying Li: State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, China

Energies, 2017, vol. 10, issue 7, 1-10

Abstract: In this work, two methods of CaCu 3 Ti 4 O 12 -CuAl 2 O 4 composite and SrCu 3 Ti 4 O 12 -CaCu 3 Ti 4 O 12 composite were prepared to improve the breakdown field in CaCu 3 Ti 4 O 12 ceramics. CaCu 3 Ti 4 O 12 -0.5CuAl 2 O 4 and 0.4SrCu 3 Ti 4 O 12 -0.6CaCu 3 Ti 4 O 12 samples with proper sintering conditions were found to have greatly enhanced breakdown fields of more than 20 kV·cm ? 1 compared to the ordinary value of 1–2 kV·cm ? 1 in CaCu 3 Ti 4 O 12 ceramics. In addition, reduced dielectric loss tangent of these samples remained about 0.1 at a low frequency of 0.1 Hz, indicating superior dielectric properties. No abnormal grain growth was found in either composite with a high breakdown field, which was attributed to the pining effect and consumption of Cu-rich phase at grain boundaries. Under analysis of the relaxation process by electric modulus, compared to conventional CaCu 3 Ti 4 O 12 ceramics, interstitial Al i ··· and increasing interfaces were responsible for variation in activation energy in CaCu 3 Ti 4 O 12 -0.5CuAl 2 O 4 composites, while the integrated action of a strong solid solution effect and weak Sr-stretching effect contributed to the elevated potential barrier height and enhanced breakdown field in 0.4SrCu 3 Ti 4 O 12 -0.6CaCu 3 Ti 4 O 12 composites.

Keywords: CCTO-based ceramics; breakdown field; pining effect; oxygen vacancy (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
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