Enhanced ionic conductivity at the interface between sapphire and solid lithium iodide
Enhanced ionic conductivity at the interface between sapphire and solid lithium iodide
复制标题
蓝宝石和固体碘化锂之间界面的离子电导率增强
DOI：
10.1007/bf01313455
复制
发表时间：
1986
期刊：
影响因子：
--
通讯作者：
K. Dransfeld
中科院分区：
文献类型：
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作者：
E. Schreck;K. Läuger;K. Dransfeld
我们已经研究了增强的离子导电性的薄膜的LiI蒸发到一个平面蓝宝石表面进行叉指Au电极。原位测量平行于表面的界面电导率，以增加膜厚度，高达3，000 μ m。在第一个300欧姆（邻近蓝宝石）中，LiI的比电导率超过LiI的体电导率近一个数量级。根据我们的观察，我们得出结论，LiI的比电导率随着距离蓝宝石表面的距离呈指数下降，仅在3，000 nm的距离处达到体LiI值。350埃厚薄膜的电导率随温度（25°C至120°C）变化，激活能为0.40±0.04 eV。这与体LiI在非本征区的激活能是一致的。
We have studied the enhanced ionic conductivity of thin films of LiI evaporated onto a planar sapphire surface carrying interdigital Au-electrodes. The interface conductivity parallel to the surface was measured in situ for increasing film thickness, up to 3,000 Å. The specific conductivity of LiI in the first 300 Å — adjacent to the sapphire — was found to exceed the bulk conductivity of LiI by nearly one order of magnitude. From our observations we conclude that the specific conductivity of LiI decreases exponentially with distance from the sapphire surface reaching the bulk LiI-value only at a distance of 3,000 Å. The conductivity of a 350 Å thick film varies with temperature (25°C≦T≦120°C) in accordance with an activation energy of 0.40±0.04 eV. This is in good agreement with the activation energy of bulk LiI in the extrinsic region.