Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 40, Issue 12, Pages 4047-4055Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2020.04.027
Keywords
Beta-Al2O3; Solid electrolytes; Orientation; Ionic conductivity
Categories
Funding
- National Natural Science Foundation of China [21663001, 51862028]
- Western Light Foundation of the Chinese Academy of Sciences
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As a material for solid electrolytes and separators, beta-Al2O3 is widely used in sodium beta alumina. In this study, a high fraction of beta-phase for beta-Al2O3 with preferred orientation was fabricated using the traditional solid-phase synthesis; and the effect of boehmite micro-structure, the aluminum source, on the phase, microstructure, mechanical properties, and conductivity properties of prepared ceramics was investigated. X-ray diffraction (XRD), and scanning electron microscopy (SEM) results illustrate that the C-axis of beta-Al2O3 grains was along the direction of uniaxial compression. Above all, samples made of rod-shaped boehmite exhibited a better degree of orientation (0.21) and a higher fraction of beta phase (96 %) than samples made of flake-shaped boehmite. Meanwhile, for samples fabricated with rod-shaped boehmite, the conductivity at 350 degrees C of the sample surface parallel to the uniaxial pressure was nearly 1.5 times (1.634E-1 S cm(-1)) greater than that of surface perpendicular to the uniaxial pressure.
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