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用穆斯堡尔谱研究Eu2O3在载体表面上的分散度

A MOSSBAUER STUDY FOR THE Eu2O3 DISPERSITY ON THE SUPPORT SURFACE

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【作者】 刘荣川夏元复王述新李玉魁颜其洁陈懿刘海洋

【Author】 LIU RONG-CHUAN XIA YUAN-FU WANG SHU-XIN LI YU-KUI (Department of Physics, Nanjing University)YAN QI-JIE CHEN YI LIU HAI-YANG(Department of Physics, Nanjing University)

【机构】 南京大学物理系南京大学物理系南京大学化学系南京大学化学系 南京邮电学院计算中心

【摘要】 用穆斯堡尔谱研究了Eu2O3在不同载体表面上的分散度。随着铕含量的变化引起的穆斯堡尔参数的差别表明了Eu2O3与不同载体之间作用上的差别。在γ-Al2O3 表面上,当Eu含量增加时,用质异能位移增加,逐渐接近于体相Eu2O3相应值,说明在逐步形成Eu2O3晶相。与此不同,在两种SiO2载体表面上,同质异能位移基本不变,表明Eu2O3在铺满单层后,倾向于按层铺排,而不是形成晶相,由穆斯堡尔谱所得结论与X射线衍射结果符合。

【Abstract】 Mossbauer spectroseopy has been used to study the dispersity of Eu2O3 on the surface of different supports. Changes in Mossbauer parameters as a function of the europium content reveal the difference of the interaction between Bu2O3 and the support. On the surface of γ-Al2O3, the Mossbauer isome shift progressively increases toward to that of bulk Eu2O3 with increasing metal loading, suggesting that the crystal phase of Eu2O3 forms gradually. In contrast, on the surfaces of two types of SiO2 the isomer shifts do not change with changing the metal loading in the range of our study. This suggests that Eus03 tends to spread out on the surface as a second layer over monola-yer dispersion. The conclusion obtained by Mossbauer spectroseopy is in agreement with that obtained by X-ray diffraction.

  • 【文献出处】 物理学报 ,Acta Physica Sinica , 编辑部邮箱 ,1986年02期
  • 【被引频次】2
  • 【下载频次】13
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