Raman spectra have been obtained for La 2 O 3 dispersed on Al 2 O 3 , but only after La 2 O 3 coverages reach one theoretical monolayer or higher. Sharp peaks at 104, 191, and 408 cm −1 were observed, which are in excellent agreement with previous studies of bulk La 2 O 3 ...
Neither gamma nor eta alumina give rise to Raman bands in their Raman spectra [8], [9]. The Raman spectrum of Conclusion We conclude that in Ni/Al2O3 catalyst, Al2O3 is in the alpha form and Ni is not present as NiO: it is embedded in the crystal structure of alumina as NiAl2...
γ2Al2O3高温相变的XRD和Raman光谱比较研究 迈,谢云龙,罗孟飞 3 方萍,何 浙江师范大学物理化学研究所,浙江省固体表面反应化学重点实验室,浙江金华321004 采用XRD和Raman光谱研究了γ2Al2O3的高温相变。Raman结果表明,位于1175,1241cm -1 和摘要 1370,1400cm ...
【精品】一、 拉曼光谱基本原理principle of Raman spectroscopy二、...30 热度: γ-Al2O3高温相变的XRD和Raman光谱 比较研究 第26卷,第11期2006年11月光谱学与光谱分析Vo1.26,No+11,pp20392042 SpectroscopyandSpectra1AnalysisNovember.2006 y-Al2O3高温相变的XRD和Raman光谱比较研究 ...
从图中可以看出600℃焙烧的Alz03没有明显的R锄an信号,随着焙烧温度升高至 175,1241800℃,在1cm-1和1 370,1400cm.1分别出现 Rarnanshift/cm1 4个峰,其中位于1370,1400crll_1的振动峰随着焙烧温度 175,1241 的升高峰强逐渐增加,而位于1cm_1的峰强度升 n昏2 LaserentRaI咖spectraof2038A1203calcinedatmf托r-...
CNTs/Al2O3-TiO2electromagnetic propertiesraman spectroscopyreflection lossCNTs/AT13 composites were prepared by mixing Al2O3-TiO2 ceramics(AT13) and carbon nanotubes with different diameters in an ultrasonic bath.CNTs/AT13 coatings were prepared by micro-plasma spraying.Raman spectra of CNTs/AT13 ...
The molecular structure of the oxidated catalysts under dehydration and hydration conditions was examined using laser Raman spectroscopy. Irrespective of the temperature and time of calcination, Raman spectra revealed that rhenium in the oxidated state is present as ReO4 monomers coordinated to the ...
n昏2 Laserent RaI咖spectraof2038 A1203calcinedatmf托r- 温至1100～1200℃时达到最大值,温度升高到1250℃这2个峰消 失。由于rAl203没有R锄an活性[9],低于800cml范围的rAl203的R砌an信号非常弱[1…,并且高于 800teInpemtu煅(A。=632.8砌) cm_1这一组峰归属于Fe3+和(或)Cr3...
Infrared and Raman spectra for α-Bi O have been recorded at 300 K and 85 K and analysed in detail. α-Bi O belongs to the monoclinic system, to space group P2 / c. From the factor group analysis, 60 lattice vibrations are distributed as 15A , 15B , 15A and 15B modes of the grou...
In this study, the evolution of microstructure and its correlation with the viscosity of CaO–SiO2-based melts, incorporating various Al2O3 additives, have been investigated by employing in situ high temperature Raman spectroscopy and viscosity model. Raman spectra of the melts were procured at 1823...