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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SiOM?ssbauer spectroseopy has been used to study the dispersity of Eu2O3 on the surface of different supports. Changes in M?ssbauer 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 M?ssbauer 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 M?ssbauer spectroseopy is in agreement with that obtained by X-ray diffraction
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物理学报. 1986, 35(2): 243-246.
doi: 10.7498/aps.35.243.
用穆斯堡尔谱研究Eu2O3在载体表面上的分散度
- 收稿日期: 1984-11-22
- 刊出日期: 1986-01-05
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SiO
English Abstract
A MOSSBAUER STUDY FOR THE Eu2O3 DISPERSITY ON THE SUPPORT SURFACE
- Received Date:
22 November 1984
- Published Online:
05 January 1986
Abstract: M?ssbauer spectroseopy has been used to study the dispersity of Eu2O3 on the surface of different supports. Changes in M?ssbauer 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 M?ssbauer 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 M?ssbauer spectroseopy is in agreement with that obtained by X-ray diffraction
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