Cold sintering ZnO based varistor ceramics with controlled grain growth to realize superior breakdown electric field
| Autor: | Jie Liang, Jing Guo, Ke Wang, Clive A. Randall, Sinan Dursun, Jianjie Sun, Xuetong Zhao |
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| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Materials science Dopant Sintering 02 engineering and technology Intergranular corrosion 021001 nanoscience & nanotechnology 01 natural sciences Grain growth Electric field visual_art 0103 physical sciences Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Grain boundary Nanometre Ceramic Composite material 0210 nano-technology |
| Zdroj: | Journal of the European Ceramic Society. 41:430-435 |
| ISSN: | 0955-2219 |
| Popis: | Controlling the grain growth and grain boundary morphology is of great importance in the manipulation of electrical properties of electro-ceramics. However, it has been a challenge to achieve dense varistor ceramics with grain sizes in submicrons and nanometers using conventional thermal sintering at high temperatures. Here we present a strategy to fabricate dense ZnO based ceramics with controlled grain growth and thin grain boundaries using cold sintering process (CSP). With CSP, the sintering temperature of ZnO based ceramics dramatically drops from 1100 °C to 300 °C. The Bi2O3, Mn2O3, and CoO dopants suppress the grain growth of ZnO under CSP conditions, and Bi-rich intergranular films (2−5 nm) can be observed along grain boundaries. The cold sintered ZnO-Bi2O3-Mn2O3-CoO ceramic shows a non-linear coefficient of 33.5, and a superior breakdown electric field of 3550 V/mm. This work thus demonstrates that CSP is a promising technique for designing new submicron-/nano-ceramics with superior performances. |
| Databáze: | OpenAIRE |
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