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Achieving ultrahigh dielectric breakdown strength in MgO-based ceramics by composite structure design
Zhang, Chi; Chen, Ying; Zhou, Mingxing; Li, Xin; Wang, Lei; Xia, Liansheng; Shen, Yi; Dong, Xianlin
2019-07-14
Source PublicationJOURNAL OF MATERIALS CHEMISTRY C
ISSN2050-7526
Volume7Issue:26Pages:8120
SubtypeArticle
AbstractThe pursuit of electronic materials and devices with high dielectric breakdown strength (DBS), and the clarification of the dielectric breakdown mechanism are of great importance to scientific research and industry applications. Among the numerous material systems, MgO has great potential due to its simple crystal structure and wide band-gap together with favorable physical properties, while its sintering behavior at high temperature turns out to be an obstacle for high DBS and its breakdown mechanism remains to be studied. On the basis of these concepts, simple (1 - x)MgO-xAl(2)O(3) dielectric ceramics were designed and prepared via a solid-state reaction method, and a 0-3 composite structure was obtained. An ultrahigh DBS was achieved in 0.92MgO-0.08Al(2)O(3) with 126.4 kV mm(-1) (0.5 mm in thickness and 8 mm in diameter), which is the highest value reported for bulk ceramics. Systematic research shows that the improvement of DBS is ascribed to a conversion from the electrical breakdown model to the thermal breakdown model, which could be explained by microstructure evolution, enhanced mechanical properties and relevant thermal properties. Meanwhile, complex impedance spectroscopy measurement reveals that the introduction of Al2O3 into MgO can obviously enhance the resistivity and activation energy, which is also beneficial to enhance the DBS. More importantly, this work not only opens up a new research and application field (such as high voltage equipment and electronic device application) for novel MgO-based ceramics, but also systematically expounds on the intrinsic mechanism of structural design to enhance the DBS.
DOI10.1039/c9tc02197c
Language英语
WOS Research AreaMaterials Science ; Physics
PublisherROYAL SOC CHEMISTRY
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.sic.ac.cn/handle/331005/26981
Collection中国科学院上海硅酸盐研究所
Recommended Citation
GB/T 7714
Zhang, Chi,Chen, Ying,Zhou, Mingxing,et al. Achieving ultrahigh dielectric breakdown strength in MgO-based ceramics by composite structure design[J]. JOURNAL OF MATERIALS CHEMISTRY C,2019,7(26):8120.
APA Zhang, Chi.,Chen, Ying.,Zhou, Mingxing.,Li, Xin.,Wang, Lei.,...&Dong, Xianlin.(2019).Achieving ultrahigh dielectric breakdown strength in MgO-based ceramics by composite structure design.JOURNAL OF MATERIALS CHEMISTRY C,7(26),8120.
MLA Zhang, Chi,et al."Achieving ultrahigh dielectric breakdown strength in MgO-based ceramics by composite structure design".JOURNAL OF MATERIALS CHEMISTRY C 7.26(2019):8120.
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