Dielectric Properties of Tungsten Copper Barium Ceramic as Promising Colossal-Permittivity Material
| Autor: | Guangzhao Li, Lajun Feng, Xiaolian Chao, Juanjuan Wang, Tiantian Ning, Kang Zhao |
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| Rok vydání: | 2017 |
| Předmět: |
Permittivity
Materials science chemistry.chemical_element 02 engineering and technology Dielectric Tungsten 01 natural sciences law.invention law 0103 physical sciences Materials Chemistry Ceramic Electrical and Electronic Engineering Composite material 010302 applied physics Metallurgy Atmospheric temperature range 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure Electronic Optical and Magnetic Materials Capacitor chemistry visual_art visual_art.visual_art_medium Grain boundary 0210 nano-technology |
| Zdroj: | Journal of Electronic Materials. 46:4697-4700 |
| ISSN: | 1543-186X 0361-5235 |
| DOI: | 10.1007/s11664-017-5504-y |
| Popis: | Ba(Cu0.5W0.5)O3 (BCW) ceramic has been fabricated and its dielectric properties investigated for use in energy-storage applications, revealing a very large dielectric constant (∼104) at 1 kHz. Moreover, the colossal-permittivity BCW ceramic exhibited fine microstructure and optimal temperature stability over a wide temperature range from room temperature to 500°C. The internal barrier layer capacitor mechanism was considered to be responsible for its high dielectric properties. Based on activation values, it is concluded that doubly ionized oxygen vacancies make a substantial contribution to the conduction and relaxation behaviors at grain boundaries. This study suggests that this kind of material has potential for use in high-density energy storage applications. |
| Databáze: | OpenAIRE |
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