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首页> 外文期刊>Journal of nanomaterials >Free Volumes Associated with Sintering in Gadolinium Doped Ceria Solid Solutions
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Free Volumes Associated with Sintering in Gadolinium Doped Ceria Solid Solutions

机译：掺d二氧化铈固溶体中与烧结相关的自由体积

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摘要

Gadolinium-doped ceria (GDC) solid solution prepared by the oxalate coprecipitation method is investigated by X-ray diffraction (XRD), complex impedance analysis, and positron lifetime spectroscopy. XRD reveals an expansion of GDC lattice constant by doping gadolinium into a ceria host crystal, in agreement with an oxygen vacancy model. The ionic conductivity of GDC measured at 773 K in air is two orders of magnitude higher than that of undoped ceria. Positron lifetime spectroscopy reveals the presence of vacancy-sized free volumes and nanovoids in interfaces among crystallites. It is found that the vacancy-sized free volumes shrink with increasing sintering temperatures. In the present paper, recent advances in the studies of GDC by XRD, complex impedance measurement, and positron lifetime spectroscopy are reviewed to gain an insight into the sintering mechanism.
机译：通过X射线衍射（XRD），复阻抗分析和正电子寿命光谱研究了草酸盐共沉淀法制备的-掺杂二氧化铈（GDC）固溶体。 XRD揭示了通过将g掺杂到二氧化铈主体晶体中，GDC晶格常数的扩展，这与氧空位模型相一致。在空气中773 K处测得的GDC的离子电导率比未掺杂的二氧化铈高两个数量级。正电子寿命光谱显示，在微晶之间的界面中存在空位大小的自由体积和纳米空隙。发现空位尺寸的自由体积随着烧结温度的升高而收缩。在本文中，对通过XRD，复阻抗测量和正电子寿命光谱学研究GDC的最新进展进行了综述，以深入了解烧结机理。

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