作为一种新的快速氧化物离子导体,非静电测量La(2 - x) GeO(5 - delta) 单临氧化物作为一种新的快速氧化物离子导体
T Ishihara1, H Arikawa, T Akbay
1Contribution from the Department of Applied Chemistry, Faculty of Engineering, Oita University, Dannoharu 700, Oita 870-1192, Japan.
Journal of the American Chemical Society
|July 18, 2001
概括
缺乏La的La2GeO5显示出有前途的氧化物离子导电性,与高温下已知材料相比. 的注增强了在较低温度下通过稳定晶体结构来提高导电性.
科学领域:
- 固态化学 固态化学
- 材料科学是一种材料科学.
- 电化学 电化学 电化学
背景情况:
- 氧化物离子导体对于固体氧化物燃料电池和电化学传感器至关重要.
- 基于La(2) GeO(5) 的材料被探索其潜在的离子导电性.
- 了解结构,缺陷和导电性之间的关系是材料优化的关键.
研究的目的:
- 为了研究La(2) GeO(5) 基氧化物的氧化离子导电性.
- 为了确定 La 缺乏对离子导电性的影响.
- 探索兴奋剂提高低温导电性的潜力.
主要方法:
- 合成和表征缺乏La的La{2}GeO{5}-delta) 和Sr-doped变体.
- 使用交流阻抗光谱测量氧化物离子导电性.
- 通过气体度细胞中的电机力 (EMF) 测量来确定传输数.
- 晶体结构分析.
主要成果:
- 缺乏La的La(2) GeO(5) 在广泛的氧气部分压力范围内表现出显著的氧离子导电性.
- 在x = 0.39时观察到的最大导电性是在La(2 - x) GeO(5 - delta).
- 氧化物离子运输号被发现为单位.
- 在T>1000K时,La的导电性 (1.61) GeO (5 - delta) 与LSGM和GDC等已知导体相美.
- 973 K 的激活能量的变化表明氧空位行为发生了变化.
- 胺稳定了高温结构,增强了低温导电性.
结论:
- 缺乏La的La(2) GeO(5) 是一个有前途的氧化离子导体,具有可调节的特性.
- 氧气空隙度和局部结构显著影响导电性.
- 兴奋剂是一种有效的策略,可以提高这些材料的低温性能.
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