| Autor: |
D. Pavlov, J. K. Vilhunen, H. Revitzer, L. Laitinen, Martin Bojinov, G. Sundholm |
| Rok vydání: |
1991 |
| Předmět: |
|
| Zdroj: |
Electrochimica Acta. 36:2093-2102 |
| ISSN: |
0013-4686 |
| DOI: |
10.1016/0013-4686(91)85215-s |
| Popis: |
During the oxidation of pure antimony (Sb) in sulphuric acid (H2SO4) solutions a passivating layer is formed on the electrode surface. In the early stage of oxidation the layer consists of amorphous Sb oxide and/or hydroxide, but with longer oxidation times aggregates of whisker-like crystals of a trivalent oxidation product, Sb4O4(OH)2SO4, are formed. The identification of this compound was done by ex situ X-ray powder diffraction, and the result was confirmed by electron microprobe and X-ray photoelectron spectroscopic analysis. By means of an extraction procedure succeeded by atomic absorption spectrometric analysis it was shown that the Sb ions dissolved during the oxidation exist in H2SO4 in the trivalent state even at potentials well above the equilibrium potential of the Sb(V)/Sb(III) couple. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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