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首页> 外文期刊>Journal of Solid State Chemistry >Mechanosynthesis and structural characterization of nanocrystalline Ce1-xYxO2-delta(x=0.1-0.35) solid solutions
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Mechanosynthesis and structural characterization of nanocrystalline Ce1-xYxO2-delta(x=0.1-0.35) solid solutions

机译：纳米晶Ce1-xYxO2-δ（x = 0.1-0.35）固溶体的力学合成和结构表征

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摘要

A series of nanostructured fluorite-type Ce1-xYxO2-delta(0 <= x <= 0.35) solid solutions, prepared via high-energy milling of the CeO2/Y2O3 mixtures, are investigated by XRD, HR-TEM, EDS and Raman spectroscopy. For the first time, complementary information on both the long-range and short-range structural features of mechanosynthesized Ce1-xYxO2-delta, obtained by Rietveld analysis of XRD data and Raman spectroscopy, is provided. The lattice parameters of the as-prepared solid solutions decrease with increasing yttrium content. Rietveld refinements of the XRD data reveal increase in microstrains in the host ceria lattice as a consequence of yttrium incorporation. Raman spectra are directly affected by the presence of oxygen vacancies; their existence is evidenced by the presence of vibration modes at similar to 560 and similar to 600 cm(-1). The detailed spectroscopic investigations enable us to separate extrinsic and intrinsic origin of oxygen vacancies. It is demonstrated that mechanosynthesis can be successfully employed in the one-step preparation of nanocrystalline Ce1-xYxO2-delta solid solutions. (C) 2015 Elsevier Inc. All rights reserved.
机译：通过XRD，HR-TEM，EDS和拉曼光谱研究了通过CeO2 / Y2O3混合物的高能研磨制备的一系列纳米结构萤石型Ce1-xYxO2-δ（0 <= x <= 0.35）固溶体。 。首次提供了有关机械合成的Ce1-xYxO2-δ的长距离和短距离结构特征的补充信息，这些信息是通过XRD数据的Rietveld分析和拉曼光谱学获得的。制备的固溶体的晶格参数随钇含量的增加而降低。 XRD数据的Rietveld精炼显示，由于掺入了钇，因此在主体二氧化铈晶格中的微应变增加。拉曼光谱直接受氧空位的影响;它们的存在可以通过类似于560和类似于600 cm（-1）的振动模式来证明。详细的光谱研究使我们能够区分氧空位的外在和内在来源。结果表明，机械合成可以成功地用于一步法制备纳米晶Ce1-xYxO2-δ固溶体。 （C）2015 Elsevier Inc.保留所有权利。

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