Kamruddin M, Ajikumar P K, Mangamma G, Mitta V K, Narasimhan S V, Tyagi A K
Materials Science Division, Indira Gandhi Centre for Atomic Research, 2BARCF, Kalpakkam 603108, Tamil Nadu, India.
J Nanosci Nanotechnol. 2009 Sep;9(9):5268-72. doi: 10.1166/jnn.2009.1173.
Ceria is an important rare-earth oxide with ever increasing applications. In nanocrystalline form, ceria exhibits novel and improved properties compared to its microcrystalline counterpart. The variation in the properties was observed to be a function of lowering particle size. This was also attributable to the presence and extent of Ce in 3+ state in ceria. Thermal decomposition of a thermally less stable cerium metal salt is an useful and simple method for the synthesis of nanocrystalline ceria. As atmosphere under which the decomposition occurs is expected to alter the Ce3+ content and thus the property, the present study is to investigate the effect of reactive atmosphere of decomposition vis-à-vis the particle size on the property of nanocrystalline ceria. Nanocrystalline ceria was synthesized by controlled thermal decomposition of cerium nitrate under four different atmospheres and the products were analyzed by X-Ray Diffraction, X-ray photoelectron spectroscopy and Laser Raman Spectroscopy. The observed property variation was found to be more dependent on the Ce3+ content thus the synthesis atmosphere rather than the particle size.
二氧化铈是一种应用日益广泛的重要稀土氧化物。与微晶形式的二氧化铈相比，纳米晶形式的二氧化铈表现出新颖且改进的性能。观察到性能变化是粒径降低的函数。这也归因于二氧化铈中三价铈的存在及其含量。热稳定性较差的铈金属盐的热分解是合成纳米晶二氧化铈的一种有用且简单的方法。由于预期分解发生时的气氛会改变三价铈的含量从而影响性能，本研究旨在探讨分解反应气氛对纳米晶二氧化铈性能以及粒径的影响。通过在四种不同气氛下对硝酸铈进行控制热分解来合成纳米晶二氧化铈，并通过X射线衍射、X射线光电子能谱和激光拉曼光谱对产物进行分析。发现观察到的性能变化更多地取决于三价铈的含量，因此取决于合成气氛而非粒径。
