Nanocrystalline Ce1-xLaxO2-δ Solid Solutions Synthesizedby Hydrolyzing and Oxidizing,
Nanocrystalline Ce1-xLaxO2-δ Solid Solutions Synthesizedby Hydrolyzing and Oxidizing,
复制标题
水解和氧化合成的纳米晶 Ce1-xLaxO2-δ 固溶体，
DOI：
10.1007/s11664-016-4417-5
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发表时间：
2017
影响因子：
2.1
通讯作者：
Xiaochen Wang
中科院分区：
文献类型：
--
作者：
Xueling Hou;Yun Xue;Ning Han;Qianqian Lu;Xiaochen Wang
采用一种新的批量生产方法合成了掺杂稀土元素的CeO 2纳米粉体。通过室温水解氧化Ce-La-C合金，然后在不同温度（873-1073 K）下煅烧1 h，成功地大规模低成本制备了Ce 1 − xLaxO 2 −δ（x= 0.15）固溶体纳米粉体。在真空感应熔炼炉中制备了Ce-La-C合金。采用X射线衍射、透射电子显微镜、比表面积分析仪和拉曼光谱对产物进行了表征。当La 3+掺入CeO 2中时，CeO 2立方萤石型相的晶格常数有增大的趋势。F2 g带的位移和拉曼光谱中没有对应于La 2 O3的峰一致地证实了La 3+离子掺入CeO 2中，并形成Ce 1 − xLaxO 2 −δ固溶体，表现为氧空位缺陷的增加。获得了高质量的Ce 1 − xLaxO 2 −δ纳米粉末，直径约为10-15 nm，BET表面积约为77 m2 g − 1。在相同的煅烧温度（1073 K）下，Ce 1-xLaxO 2-δ的平均晶粒尺寸小于CeO 2的平均晶粒尺寸，这表明La 3+引入CeO 2可以稳定主体晶格并细化高温下的晶粒尺寸。
We undertook a novel batch production approach for the synthesis of CeO2nanopowders doped with rare earth elements. Solid solution nanopowders of Ce1−xLaxO2−δ(x= 0.15) were successfully synthesized in a large-scale and low-cost production by hydrolyzing and oxidizing Ce-La-C alloys at room temperature and subsequent calcining of their powders at different temperatures (873–1073 K) for 1 h. The Ce-La-C alloys were prepared in a vacuum induction melting furnace. The final products were characterized by x-ray diffraction, transmission electron microscopy, Brunner–Emmet–Teller (BET) surface area analyzer, and Raman spectroscopy. The calculated lattice parameters of the cubic fluorite-type phase of CeO2tended to increase when La3+was incorporated into CeO2. TheF2gband shift and the absence of a peak corresponding to La2O3in the Raman spectra consistently confirmed the incorporation of the La3+ion into CeO2, and the formation of Ce1−xLaxO2−δsolid solutions as manifested by increased oxygen vacancy defects. High-quality Ce1−xLaxO2−δnanopowders of ~10–15 nm diameter with a high BET surface area of ~77 m2g−1were obtained. The average crystallite size of Ce1−xLaxO2−δwas found to be smaller than that of CeO2for the same calcination temperature of 1073 K, demonstrating that the introduction of La3+into CeO2can stabilize the host lattice and refine the grain size at high temperatures.