Atomic-Level Characterization of Dynamics of Copper Ions in CuAgSe

Atomic-Level Characterization of Dynamics of Copper Ions in CuAgSe
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CuAgSe 中铜离子动力学的原子级表征

DOI:
10.1021/acs.jpcc.5b12296
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发表时间:
2016-02
影响因子:
3.7
通讯作者:
Wu Guangheng
Wu Guangheng
中科院分区:
化学3区
文献类型:
--
作者:
Shi Chenglong;Xi Xuekui;Hou Zhipeng;Liu Enke;Wang Wenhong;Jin Shifeng;Wu Yue;Wu Guangheng

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为了研究金属硫系声子玻璃中离子在原子水平上的迁移,在原型CuAgSe化合物中进行了63Cu固体核磁共振(NMR)谱分析。在超离子状态下观察到的特征性运动收缩效应为单离子跳跃而非自由离子运动模型提供了明确的证据。我们进一步发现,在研究的温度范围内,热导率与核磁共振揭示的阳离子动力学密切相关。这项研究提供了更好的理解微观结构如何影响热输运性质,这是目前对过渡金属硫族化物基快离子导体感兴趣的。
To examine the ionic migrations on atomic level in metal chalcogenide phonon glasses, 63Cu solid state nuclear magnetic resonance (NMR) spectroscopy was performed in an archetype CuAgSe compound. The observed characteristic motional narrowing effect in the superionic state provide clear evidence for the model of single ion-hopping instead of free-ion-like motion. We further find, for the first time, that thermal conductivity is strongly correlated with cation dynamics revealed by NMR within the range of temperatures investigated. This investigation provides better understanding how microscopic structure affects thermal transport properties which is of current interest in transition-metal chalcogenide based fast ion conductors.
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