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首页> 外文期刊>Physical chemistry chemical physics: PCCP >Ionic conductivity and activation energy for oxygen ion transport in superlattices-the semicoherent multilayer system YSZ(ZrO2 =9.5 mol% Y2O3)/Y2O3
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Ionic conductivity and activation energy for oxygen ion transport in superlattices-the semicoherent multilayer system YSZ(ZrO2 =9.5 mol% Y2O3)/Y2O3

机译：超晶格中半离子多层系统YSZ（ZrO2 = 9.5 mol％Y2O3）/ Y2O3的离子传导性和氧离子传输的活化能

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摘要

The oxygen ion conductivity of YSZ(ZrO2 =9.5 mol% Y2O3)/Y2O3 multilayer systems is measured parallel to the interfaces as a function of temperature between 350 and 700°C.The multilayer samples are prepared by pulsed laser deposition(PLD).The film thicknesses,the crystallinity,the texture and the microstructure are investigated by SEM,XRD,HRTEM and SAED.To separate the interface contribution of the total conductivity from the bulk contribution the thickness of the YSZ and Y2O3 layers is varied systematically.The total conductivity of the YSZ films increases when their thickness is decreased from 0.53 mu m to 24 nm.It depends linearly on the reciprocal thickness of the individual layers,thus on the number of YSZ/Y2O3 interfaces.This behaviour results from the parallel connection between individual conduction paths in the bulk and the interfacial regions.The activation energy for the ionic conductivity decreases from 1.13 to 0.99 kJ mol~(-1)by decreasing the thicknesses of the individual YSZ layers.HRTEM studies show that the YSZ/Y2O3 interfaces are semicoherent.The correlation between interface structure and ionic conduction is discussed.
机译：平行于界面测量YSZ（ZrO2 = 9.5 mol％Y2O3）/ Y2O3多层系统的氧离子电导率，随温度在350至700°C之间变化，通过脉冲激光沉积（PLD）制备多层样品。通过SEM，XRD，HRTEM和SAED研究了薄膜的厚度，结晶度，织构和微观结构。为了将总电导率的界面贡献与体积贡献分开，系统地改变了YSZ和Y2O3层的厚度。当YSZ膜的厚度从0.53μm减小到24 nm时，YSZ膜的厚度增加，这与各层的倒数成线性关系，因此取决于YSZ / Y2O3界面的数量。离子电导率的激活能通过减小个体的厚度而从1.13降低到0.99 kJ mol〜（-1）。 YSZ层。HRTEM研究表明YSZ / Y2O3界面是半相干的。讨论了界面结构与离子传导之间的关系。

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