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- Title
Nanocrystalline CeLaO Solid Solutions Synthesized by Hydrolyzing and Oxidizing.
- Authors
Hou, Xueling; Xue, Yun; Han, Ning; Lu, Qianqian; Wang, Xiaochen; Phan, Manh-Huong; Zhong, Yunbo
- Abstract
We undertook a novel batch production approach for the synthesis of CeO nanopowders doped with rare earth elements. Solid solution nanopowders of CeLaO ( 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 CeO tended to increase when La was incorporated into CeO. The F band shift and the absence of a peak corresponding to LaO in the Raman spectra consistently confirmed the incorporation of the La ion into CeO, and the formation of CeLaO solid solutions as manifested by increased oxygen vacancy defects. High-quality CeLaO nanopowders of ~10-15 nm diameter with a high BET surface area of ~77 m g were obtained. The average crystallite size of CeLaO was found to be smaller than that of CeO for the same calcination temperature of 1073 K, demonstrating that the introduction of La into CeO can stabilize the host lattice and refine the grain size at high temperatures.
- Subjects
SOLID solutions; HYDROLYSIS; OXIDATION; NANOCRYSTALS; RARE earth metals
- Publication
Journal of Electronic Materials, 2016, Vol 45, Issue 5, p2559
- ISSN
0361-5235
- Publication type
Article
- DOI
10.1007/s11664-016-4417-5