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	柠檬酸溶胶-凝胶法制备的纳米Ce_(1-x)Mn_xO_2:织构与晶相结构
	叶青 ; 徐柏庆 ; Qing XU ; Bo-Qing
	2010-06-07 ; 2010-06-07
关键词	Ce_(1-x)Mn_xO_2 溶胶-凝胶法 N2-吸附/脱附 XRD Raman光谱 TEM Ce_(1-x)Mn_xO_2, Sol-gel preparation, N2/adsorption-desorption, XRD, Raman spectrum, TEM O614.332
其他题名	Textural and Structure Characterizations of Ce_(1-x)Mn_xO_2 Prepared by Citric Acid Sol-Gel Method
中文摘要	采用N2-吸附/脱附、XRD、Raman光谱和TEM等表征技术研究了柠檬酸溶胶-凝胶法制备的Ce1-xMnxO2(0≤x≤1)样品的织构及晶相结构.结果表明,Ce1-xMnxO2样品的N2吸附等温线为IV型,滞后环为H1型,最可几孔径处在2.5￣3.7nm范围.由XRD测得的样品晶粒大小与由TEM测定的颗粒尺寸相近,表明制备的样品具有较好的分散性,但是样品的组成对颗粒大小有明显的影响,Mn浓度适中样品(x=0.3￣0.7)的颗粒(1￣5nm)明显小于低Mn浓度样品(x<0.3)和高Mn浓度样品(x>0.7)的颗粒(10￣50nm).尽管在x>0.7时,XRD未能检测到样品中有α-Mn2O3晶粒存在,但Raman光谱结果表明,所有Ce1-xMnxO2混合氧化物均以α-Mn2O3相和立方CeO2相Ce-Mn-O固溶体形式存在.; Textural and structure characterizations of Ce1-xMnxO2(0≤x≤1) samples were studied by N2 adsorption/desorption, XRD and Raman spectroscopy. The N2 adsorption/desorption isotherms are found to be IV-type according to BDDT and their related hysteresis loops are H1 type. Pore size distribution of the Ce1-xMnxO2 samples is in the mesopores range with Rp (max) between 2.5 nm and 3.7 nm. Particle sizes of the samples with both high Mn (x>0.7) and low Mn (x<0.3) contents are larger than those with 0.3≤x≤0.7. Raman spectroscopic results show that the Ce1-xMnxO2 (x≠0, 1) samples contain mixed phases of α-Mn2O3 and Ce-Mn-O solid solution, although the presence of α-Mn2O3 phase is not detected in the XRD measurement of the samples with x≤0.7, suggesting that Raman spectroscopy is more sensitive in the structural characterization of Ce1-xMnxO2 samples.; 国家自然科学基金(20125310,20590360)资助项目
语种	中文 ; 中文
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/40585]
专题	清华大学
推荐引用方式 GB/T 7714	叶青,徐柏庆,Qing XU,等. 柠檬酸溶胶-凝胶法制备的纳米Ce_(1-x)Mn_xO_2:织构与晶相结构[J],2010, 2010.
APA	叶青,徐柏庆,Qing XU,&Bo-Qing.(2010).柠檬酸溶胶-凝胶法制备的纳米Ce_(1-x)Mn_xO_2:织构与晶相结构..
MLA	叶青,et al."柠檬酸溶胶-凝胶法制备的纳米Ce_(1-x)Mn_xO_2:织构与晶相结构".(2010).

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