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X-ray photoelectron spectroscopic study of hydrated aluminas and aluminas

Published online by Cambridge University Press:  03 March 2011

Takeshi Tsuchida  and
Hideaki Takahashi
Takeshi Tsuchida
Affiliation:
Department of Applied Chemistry, Faculty of Engineering, Hokkaido University, North 13 West 8, Kita-Ku, Sapporo 060, Japan
Hideaki Takahashi
Affiliation:
Department of Applied Chemistry, Faculty of Engineering, Hokkaido University, North 13 West 8, Kita-Ku, Sapporo 060, Japan
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Abstract

X-ray photoelectron spectra of hydrated aluminas (boehmite, diaspore, bayerite, and gibbsite), transition aluminas (y, δ, η, θ, X, and k –Al2O3) and corundum (α-Al2O3) have been studied for spectral characterization of each compound. The O1s spectra are shifted 0.2–1.2 eV to higher binding energy (Eb) in the order of α-Al2O3 < boehmite, diaspore < bayerite, gibbsite, and this agrees with the order of bulk OH/Al molar ratio in samples. The Eb and FWHM values of O1s spectra of transition aluminas depend on the ratio OH/O, i.e., the amount of OH− ions chemisorbed on them, and tend to decrease toward those of α-Al2O3 with increasing calcination temperature. Therefore, it is considered that an attracting effect of the proton on valence electrons in the hydroxyl oxygen causes the increased binding energy between core electrons and oxygen atomic nuclei. The broad O1s spectra of boehmite and diaspore can be deconvoluted into equal contribution from the two oxygen species in O2− and OH− ions in their structures.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 11 , November 1994 , pp. 2919 - 2924
Copyright
Copyright © Materials Research Society 1994

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References

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