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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Formation of amorphous LiCl aggregate regions in LiCl-Li2O-P2O5 fast ion conducting glasses studied by ac conductometry and Li-7 MAS NMR
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Formation of amorphous LiCl aggregate regions in LiCl-Li2O-P2O5 fast ion conducting glasses studied by ac conductometry and Li-7 MAS NMR

机译：通过交流电导法和Li-7 MAS NMR研究LiCl-Li2O-P2O5快速离子导电玻璃中非晶LiCl聚集区的形成

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摘要

Fast Li+-ion conducting glasses of LiCl-Li2O P2O5 system with different glass network structures were synthesized by a twin-roller quenching method. Ac conductometry and Li-7 MAS NMR measurements were performed for the glasses in order to obtain the information about the microscopic structure and the ion conduction mechanism of the glasses. The activation energies of Li+-ion conduction for the glasses of (LiCl)(x)(LiPO3)(1-x), (,)(LiCl)(x)(Li1.4PO3.2)(1-x) and (LiCl)(x)(Li1.67PO3.33)(1-x), in which LiPO3, Li1.4PO3.2 and Li1.67PO3.33 have different network structures of one dimensional chain, pentamer and trimer, respectively, were revealed to converge upon a certain value of 46 +/- 2 kJ mol(-1) in a high LiCl composition range near the glass-forming composition limit, independent of the glass network structures. Li MAS NMR spectra of the glasses showed a broad signal, and a linear dependence of the chemical shift on LiCl composition, x, was observed. The glasses with relatively high LiCl compositions exhibited a sharp signal besides the broad one in the spectra. The chemical shift of the sharp signal corresponded well with that estimated by extrapolating the linear relation between the chemical shift of the broad signal and the LiCl composition to the limit value of x = 1, and the sharp signal was assigned reasonably to the Li+ ions interacting only with Cl- ions. It was concluded from the results that amorphous LiCl aggregate regions were formed within the glasses in the high LiCl composition range, and that the Li+ ions included in the amorphous LiCl aggregates contributed mainly to the fast ion conduction of the glasses. (c) 2006 Elsevier B.V. All rights reserved.
机译：采用双辊淬火法合成了具有不同玻璃网络结构的LiCl-Li2O P2O5体系快速锂离子导电玻璃。为了获得有关眼镜的微观结构和离子传导机理的信息，对眼镜进行了交流电导率测定和Li-7 MAS NMR测量。 （LiCl）（x）（LiPO3）（1-x），（，）（LiCl）（x）（Li1.4PO3.2）（1-x）和（）的玻璃的Li +离子传导活化能揭示了LiCl）（x）（Li1.67PO3.33）（1-x），其中LiPO3，Li1.4PO3.2和Li1.67PO3.33分别具有不同的一维链，五聚体和三聚体网络结构。可以在接近玻璃形成组成极限的高LiCl组成范围内收敛到46 +/- 2 kJ mol（-1）的某个值，而与玻璃网络结构无关。所述玻璃的Li MAS NMR光谱显示宽信号，并且观察到化学位移对LiCl组成x的线性依赖性。 LiCl含量较高的玻璃除了光谱中较宽的玻璃外，还显示出清晰的信号。尖锐信号的化学位移与通过将宽信号和LiCl组成的化学位移之间的线性关系外推到x = 1的极限值所估计的值非常吻合，并且将尖锐信号合理地分配给了相互作用的Li +离子仅含Cl-离子。从该结果可以得出结论，在高LiCl组成范围内在玻璃内形成非晶LiCl聚集体区域，并且非晶LiCl聚集体中包含的Li +离子主要有助于玻璃的快速离子传导。 （c）2006 Elsevier B.V.保留所有权利。

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