在Ga替代的Na2中介层Na-离子的动力学Zn2TeO6 (NZTO) 通过可变温度固态Na23NMR光谱和DFT建模研究
Frida Sveen Hempel1,2, Charlotte Martineau-Corcos3, Federico Bianchini2
1SINTEF Industry, Forskningsveien 1, 0373 Oslo, Norway.
ACS physical chemistry Au
|July 31, 2023
概括
这项研究研究了Na2-Zn2-GaTeO6中的离子动态,使用NMR和模拟. 的替代增强了离子的移动性,减少了在固态离子导体中潜在使用的激活能量.
科学领域:
- 固态化学 固态化学
- 材料科学是一种材料科学.
- 离子运输现象 离子运输现象
背景情况:
- 了解离子的局部协调和动态对于开发先进材料至关重要.
- 离子导体对于下一代储能器件至关重要.
- 在层状氧化物中,有价替代对离子动态的影响需要详细的研究.
研究的目的:
- 阐明Na2-Zn2-Ga6 (NZTO) 中的局部 (Na) 协调和动态,其中的Ga含量不同 (x = 0.000.20).
- 为了研究替代对Na-ion流动性和激活能量的影响.
- 将实验发现与理论模拟相关联,以全面了解离子运输.
主要方法:
- 可变温度的Na核磁共振 (NMR) 光谱法在不同的温度范围和磁场 (100500 K,11.718.8 T) 中使用.
- 密度功能理论 (DFT) 和Ab Initio分子动力学 (AIMD) 模拟被用来补充实验数据.
- 对NMR线形和自旋格子 (T1) 放松常数的分析提供了对Na-ion动态和局部结构的见解.
主要成果:
- 在低温 (100 K) 时,观察到离子在很大程度上是静态的,这允许在三个不同的层间位点进行局部结构表征.
- 温度上升导致了由于Na-ion动态的光谱平均值,三位点交换模型解释了观察到的峰值凝聚和分裂.
- 发现替代增加了Na-跳跃率并降低了Na动态的激活能量,这得到了NMR放松测量和DFT计算的支持.
结论:
- 该研究成功地描述了NZTO中Na-离子的温度依赖的动态,在不同的温度状态下揭示了不同的行为.
- 的替换通过减少激活能量显著提高了Na-ion的移动性,这表明了固态离子导体性能改善的潜力.
- 了解相关离子运动和替代对激活能的影响对于设计高效的固态离子导体材料至关重要.
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