High Breakdown Field CaCu3Ti4O12 Ceramics: Roles of the Secondary Phase and of Sr Doping
In this work, two methods of CaCu3Ti4O12-CuAl2O4 composite and SrCu3Ti4O12-CaCu3Ti4O12 composite were prepared to improve the breakdown field in CaCu3Ti4O12 ceramics. CaCu3Ti4O12-0.5CuAl2O4 and 0.4SrCu3Ti4O12-0.6CaCu3Ti4O12 samples with proper sintering conditions were found to have greatly enhanced...
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doaj-eacca7e0494147f7a308f1ec1f62bc802020-11-25T00:10:10ZengMDPI AGEnergies1996-10732017-07-01107103110.3390/en10071031en10071031High Breakdown Field CaCu3Ti4O12 Ceramics: Roles of the Secondary Phase and of Sr DopingZhuang Tang0Kangning Wu1Yuwei Huang2Jianying Li3State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, ChinaState Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, ChinaState Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, ChinaState Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, ChinaIn this work, two methods of CaCu3Ti4O12-CuAl2O4 composite and SrCu3Ti4O12-CaCu3Ti4O12 composite were prepared to improve the breakdown field in CaCu3Ti4O12 ceramics. CaCu3Ti4O12-0.5CuAl2O4 and 0.4SrCu3Ti4O12-0.6CaCu3Ti4O12 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 CaCu3Ti4O12 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 CaCu3Ti4O12 ceramics, interstitial Ali··· and increasing interfaces were responsible for variation in activation energy in CaCu3Ti4O12-0.5CuAl2O4 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 0.4SrCu3Ti4O12-0.6CaCu3Ti4O12 composites.https://www.mdpi.com/1996-1073/10/7/1031CCTO-based ceramicsbreakdown fieldpining effectoxygen vacancy |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Zhuang Tang Kangning Wu Yuwei Huang Jianying Li |
spellingShingle |
Zhuang Tang Kangning Wu Yuwei Huang Jianying Li High Breakdown Field CaCu3Ti4O12 Ceramics: Roles of the Secondary Phase and of Sr Doping Energies CCTO-based ceramics breakdown field pining effect oxygen vacancy |
author_facet |
Zhuang Tang Kangning Wu Yuwei Huang Jianying Li |
author_sort |
Zhuang Tang |
title |
High Breakdown Field CaCu3Ti4O12 Ceramics: Roles of the Secondary Phase and of Sr Doping |
title_short |
High Breakdown Field CaCu3Ti4O12 Ceramics: Roles of the Secondary Phase and of Sr Doping |
title_full |
High Breakdown Field CaCu3Ti4O12 Ceramics: Roles of the Secondary Phase and of Sr Doping |
title_fullStr |
High Breakdown Field CaCu3Ti4O12 Ceramics: Roles of the Secondary Phase and of Sr Doping |
title_full_unstemmed |
High Breakdown Field CaCu3Ti4O12 Ceramics: Roles of the Secondary Phase and of Sr Doping |
title_sort |
high breakdown field cacu3ti4o12 ceramics: roles of the secondary phase and of sr doping |
publisher |
MDPI AG |
series |
Energies |
issn |
1996-1073 |
publishDate |
2017-07-01 |
description |
In this work, two methods of CaCu3Ti4O12-CuAl2O4 composite and SrCu3Ti4O12-CaCu3Ti4O12 composite were prepared to improve the breakdown field in CaCu3Ti4O12 ceramics. CaCu3Ti4O12-0.5CuAl2O4 and 0.4SrCu3Ti4O12-0.6CaCu3Ti4O12 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 CaCu3Ti4O12 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 CaCu3Ti4O12 ceramics, interstitial Ali··· and increasing interfaces were responsible for variation in activation energy in CaCu3Ti4O12-0.5CuAl2O4 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 0.4SrCu3Ti4O12-0.6CaCu3Ti4O12 composites. |
topic |
CCTO-based ceramics breakdown field pining effect oxygen vacancy |
url |
https://www.mdpi.com/1996-1073/10/7/1031 |
work_keys_str_mv |
AT zhuangtang highbreakdownfieldcacu3ti4o12ceramicsrolesofthesecondaryphaseandofsrdoping AT kangningwu highbreakdownfieldcacu3ti4o12ceramicsrolesofthesecondaryphaseandofsrdoping AT yuweihuang highbreakdownfieldcacu3ti4o12ceramicsrolesofthesecondaryphaseandofsrdoping AT jianyingli highbreakdownfieldcacu3ti4o12ceramicsrolesofthesecondaryphaseandofsrdoping |
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