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用穆斯堡尔谱学,X射线衍射和激光喇曼光谱研究了EU_2O_3在非晶Al_2O_3上的固体-固体表面吸附。没有观察到Eu_2O_3的X射线衍射峰。随着Eu_2O_3含量的增加,同质异能移和线宽持续增加并趋近体相Eu_2O_3值。激光喇曼光谱表明Eu_2O_3含量为18.7wt.％时,出现表征二维含铕表面氧物种998cm~(-1)和1051cm~(-1)的两个弱振动峰。当Eu_2O_3含量增加到36.5wt.％时,出现表面氧物种的1068cm~(-1)峰和Eu_(23)的342cm~(-1)特征峰。比较了Eu_2O_3在非晶Al_2O_3和在其他载体表面的分散情况。同质异能移的变化缘于载体具有不同的电负性。研究结果表明,存在载体对分散在载体表面的Eu_2O_3结构形成的诱导效应。
The solid-solid surface adsorption of EU_2O_3 on amorphous Al_2O_3 was investigated by Mossbauer spectroscopy, X-ray diffraction and laser Raman spectroscopy. No X-ray diffraction peak of Eu 2 O 3 was observed. With the increase of Eu 2 O 3 content, the homogeneity of energy shift and linewidth continued to increase and approached the bulk Eu 2 O 3 value. Laser Raman spectroscopy showed that two weak vibration peaks of 998 cm -1 and 1051 cm -1 were observed when the content of Eu 2 O 3 was 18.7wt.%. When the content of Eu 2 O 3 increased to 36.5wt.%, The peak of 1068cm -1 and the 342cm -1 of Eu 23 were observed. Eu_2O_3 was compared with the surface of amorphous Al_2O_3 and other supports. Homomorphism shift changes due to the carrier has a different electronegativity. The results show that there is an inductive effect of the carrier on the formation of the Eu 2 O 3 structure dispersed on the surface of the carrier.