Preparation of Na-β″-Al<sub>2</sub>O<sub>3</sub> solid electrolyte with nano-η-Al<sub>2</sub>O<sub>3</sub> by double zeta process
Na-β″-Al<sub>2</sub>O<sub>3</sub> was prepared with nano-η-Al<sub>2</sub>O<sub>3</sub> powder by a double zeta process, MgO as stabilizer. The compactness, microstructure and mechanical properties of the samples were studied by Archimedes, SEM and thre...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Journal of Materials Engineering
2021-06-01
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| Series: | Cailiao gongcheng |
| Subjects: | |
| Online Access: | http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2019.001059 |
| Summary: | Na-β″-Al<sub>2</sub>O<sub>3</sub> was prepared with nano-η-Al<sub>2</sub>O<sub>3</sub> powder by a double zeta process, MgO as stabilizer. The compactness, microstructure and mechanical properties of the samples were studied by Archimedes, SEM and three-point bending method, and the β″-Al<sub>2</sub>O<sub>3</sub> phase content and ionic conductivity of the samples were studied by XRD and EIS. The results show that double zeta process is beneficial to improve the uniformity of sample structure. Nano-η-Al<sub>2</sub>O<sub>3</sub> is easier to synthesize Na-β″-Al<sub>2</sub>O<sub>3</sub> solid electrolyte than high purity α-Al<sub>2</sub>O<sub>3</sub>, the addition of appropriate MgO can increase the content of the β″-Al<sub>2</sub>O<sub>3</sub> phase and the compactness of the samples, reduce the grain boundary resistance of the sample and improve the ionic conductivity of the electrolyte. Excessive MgO doping results in the growth of pore size in the samples, which will increase the grain resistance and decrease the ionic conductivity. The ionic conductivity of the electrolyte material reaches 0.0396 S·cm<sup>-1</sup> at 300 ℃ when the amount of MgO is 2% (mass fraction). |
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| ISSN: | 1001-4381 1001-4381 |