Fast Ionic Conductivity and Dielectric Properties of the Lithium Halide Spinels Li2MnCl4, Li2CdCl4, Li2MnBr4, and Li2CdBr4
Fast Ionic Conductivity and Dielectric Properties of the Lithium Halide Spinels Li2MnCl4, Li2CdCl4, Li2MnBr4, and Li2CdBr4
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卤化锂尖晶石 Li2MnCl4、Li2CdCl4、Li2MnBr4 和 Li2CdBr4 的快离子电导率和介电性能
DOI：
10.1002/bbpc.19840880810
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发表时间：
1984
影响因子：
15
通讯作者：
H. Lutz
中科院分区：
文献类型：
--
作者：
W. Schmidt;H. Lutz
与相应的氯化物尖晶石一样，溴化锂尖晶石Li2MnBr4和Li2CdBr4在固态下表现出快速的离子导电性。然而，溴化物尖晶石的比电导率略小于氯化物的电导率，例如，在400C时，镉化合物的比导分别为0.11和0.26Ω−1 cm−1。即使是Li2MnCl4-−4xBr4x固溶体也没有表现出比纯Li2MnCl4更高的导电性。在较高温度下，Li2MnBr4的电导活化能降低，如Li2MnBr4的电导激活能从60kJ−1降至33kJ molBr1，这是由于高温下阳离子亚晶格的无序所致。锂离子导电化合物的非理想介电行为，在阻抗图上表现为杂散和半圆形的特征倾斜，可与结构变化(高温下的无序)和卤化物离子的不同极化率有关。
The lithium bromide spinels Li2MnBr4 and Li2CdBr4 exhibit fast ionic conductivity in the solid state as the corresponding chloride spinels. The specific conductivities of the bromide spinels, however, are slightly smaller than those of the chlorides, e.g. for the cadmium compounds 0.11 and 0.26 Ω−1 cm−1 at 400°C, respectively. Even Li2MnCl4-−4xBr4x solid solutions do not show higher conductivity than pure Li2MnCl4. The activation energies for conduction decrease at higher temperatures, e.g. from 60 to 33 kJ mol−1 for Li2MnBr4, caused by disorder of the cation sublattice at elevated temperatures. The non-ideal dielectric behaviour of the lithium ion conducting compounds shown by a characteristic inclination of the spurs and skewness of the semicircles in the impedance diagrams can be correlated to both structure changes (disorder at elevated temperatures) and the different polarizability of the halide ions.