Yb_2O_3纳米晶的制备及其若干性质的研究

Preparation and Properties of Nanocrystalline Yb_2O_3

用溶胶 -凝胶法制备了不同粒径的 Yb2 O3纳米晶。XRD分析表明 :所合成的 Yb2 O3纳米晶属于立方晶系 ,空间群为 Ia3。TEM分析表明 :所合成的 Yb2 O3粒子基本呈球形。计算表明 :Yb2 O3的平均晶粒度随焙烧温度的升高而增大 ,而平均晶格畸变率随焙烧温度的升高和晶粒度的增大而减小 ,表明晶粒越小 ,晶格畸变越大 ,微晶发育越不完整。溶解性试验表明 :Yb2 O3晶粒度减小 ,表面活性增加。FTIR光谱分析表明 :纳米 Yb2 O3比普通的 Yb2 O3具有更高的表面活性 ,Yb- O键的吸收强度减弱 ,有微小的蓝移。

Nanocrystalline Yb 2O 3 of various particle sizes was prepared using sol gel method. XRD analysis shows that the prepared nanocrystalline Yb 2O 3 is cubic in structure with space group Ia3. TEM photographs indicate that Yb 2O 3 nanoparticles are basically spherical in shape. Calculation of crystallite size indicates that the average crystallite size of Yb 2O 3 increases with increasing calcination temperature, but the average crystal lattice distortion rate decreases with increasing calcination temperature and crystallite size. This reault shows that the smaller the crystallite size, the bigger the crystal lattice distortion, and the worse crystal growth. Solubility test of Yb 2O 3 in nitric acid shows that the surface activity of Yb 2O 3 increases with decreasing crystallite size. Fourier Transform Infrared Spectrometer (FTIR) spectra reveal that nanocrystalline Yb 2O 3 has higher surface activity than that of ordinary Yb 2O 3. Absorbance intensity of Yb O bond of nanocrystalline Yb 2O 3 is weaker than that of ordinary Yb 2O 3, and the absorbance of Yb O bond of nanocrystalline Yb 2O 3 is small blue shifted.