Fritsch, S. ; Sarrias, J. ; Rousset, A. ; Kulkarni, G. U. (1998) Low-temperature oxidation of Mn3O4 hausmannite Materials Research Bulletin, 33 (8). pp. 1185-1194. ISSN 0025-5408
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Official URL: http://www.sciencedirect.com/science/article/pii/S...
Related URL: http://dx.doi.org/10.1016/S0025-5408(98)00108-1
Abstract
Hausmannite, Mn3O4, with a specific surface area of 10 m2/g has been oxidized at low temperatures (300°C < T < 425°C). In this temperature range both Mn2+ and Mn3+ cations are oxidized. The oxidation of Mn2+ to Mn3+ is governed by a diffusion process and the spinel structure is stable up to 425°C. Oxidation of Mn3+ to Mn4+ leads to the crystallization of the Mn5O8 phase. Careful oxidation studies show the formation of two metastable manganese oxides, Mn5O8 and a defect spinel of the formula Mn2O2.78. The coordination numbers and the cation–anion distances in Mn3O4, γ-Mn2O2.78, and α-Mn2O3 obtained by EXAFS (extended X-ray absorption fine structure) are compared.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| Keywords: | Oxides; Thermogravimetric Analysis (TGA); XAFS (EXAFS, XANES); X-ray Diffraction |
| ID Code: | 103404 |
| Deposited On: | 15 Feb 2017 15:04 |
| Last Modified: | 15 Feb 2017 15:04 |
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