摘要
利用X射线粉末衍射、透射电子显微术、电子衍射和场发射电子扫描显微术,对不同方法制备的形态、颗粒大小不同的纳米Nd(OH)3进行钕离子的增强电子拉曼光谱研究,发现晶体结构、形态不同的纳米Nd(OH)3由于配位环境变化,导致钕离子的电子拉曼光谱在2600~1600 cm-1附近拉曼谱带的峰形、峰位和峰的数目产生显著变化。
Nd （OH）3 particles sized of nanometer have been prepared using the different methods. The obtained neodymium hydroxide samples were investigated using the enhanced electronic Raman spectroscopy, Xray diffraction, transmission electron microscopy, as well as field emission electron microscopy. Observable changes in electronic Raman bands were found among the electronic Raman spectra of Nd （OH）3 particles which formed under different physical-chemical conditions. Compared to the difference of the X-ray diffraction paterns, it suggests that the change of size and morphology of Nd （OH）3 particles occurs with subtle variation on the coordination environment around the neodymium ions, while the X-ray diffraction indicates the different long-ranged ordered structure of the Nd （OH）3 particles. Furthermore, the selected area electron diffraction （SAED）, which manifests several crystal cells orientation, shows that the obtained Nd（OH）3 particles are of the same hexagonal symmetry of Nd （OH）3. Therefore, the X-ray diffraction, selected area electron diffraction （SAED） and enhanced electronic Raman spectroscopy reflect different levels of structure of neodymium hydroxide in morphological, crystalline, and coordination environment. At certain extent, the subtle variation of coordination structure may account for the special physical-chemical properties of nanometer materials. The enhanced electonic Raman spectroscopy could be a new probe to study the subtle variation of the physical-chemical properties of nanometer materials.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2006年第3期328-332,共5页
Journal of the Chinese Society of Rare Earths
关键词
电子拉曼光谱
Nd(OH)3
纳米
晶体
稀土
enhanced electronic raman
neodymium hydroxide
nano-particles
crystal
rare earths
