Preparation of Oriented Beta"-Al2O3 Electrolytes by Freeze-Drying and Study of their Morphology Dependence

被引：1
|
作者：
Ma, Mingyuan [1 ]
Li, Kaiyun [1 ]
Yang, Yang [1 ]
Zhang, Xiao [2 ]
Liang, Sen [1 ]
机构：
[1] Ningxia Univ, Key Lab Ningxia Photovolta Mat, Yinchuan 750021, Ningxia, Peoples R China
[2] North Minzu Univ, Sch Mat Sci & Engn, Yinchuan 750021, Ningxia, Peoples R China
来源：
JOURNAL OF ELECTRONIC MATERIALS | 2022年 / 51卷 / 07期
基金：
中国国家自然科学基金;
关键词：
Beta"-Al2O3; freeze-drying; Na+ conductivity; degree of orientation; BETA-ALUMINA CERAMICS; IONIC-CONDUCTIVITY; SOLID-ELECTROLYTE; SODIUM BETA''; PRECURSORS; BATTERIES; BOEHMITE;
D O I：
10.1007/s11664-022-09614-7
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Beta''-Al2O3 powder was prepared through freeze-drying with liquid nitrogen, then pressed into bulk samples and sintered at 1570 degrees C. The effects of Al2O3 morphology (rod shaped or flake shaped) on the properties of sintered samples were well discussed. The rod-shaped Al2O3 sample shows a Lotgering factor (LF) of 0.38, an ionic conductivity of 1.852 x 10(-1) S cm(-1) for the direction parallel to the pressure at 350 degrees C and a bending strength of 192 MPa, all of which are much higher than those of the flake shaped sample (0.08, 178 MPa, and 3.08 x 10(-3) S cm(-1), respectively). For the rod-shaped sample, the freeze-drying process has evidently increased the degree of crystal orientation and therefore shortened the ion migration path, thereby enhancing its ionic conductivity.
引用
收藏
页码：3727 / 3735
页数：9
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