Effect of Mechanical Activation on the Real Structure and Reactivity of Iron(III) Oxide with Corundum-Type Structure Full article
| Journal |
Journal of Solid State Chemistry
ISSN: 0022-4596 , E-ISSN: 1095-726X |
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| Output data | Year: 1996, Volume: 123, Number: 2, Pages: 191-202 Pages count : 12 DOI: 10.1006/jssc.1996.0168 | ||||
| Tags | SURFACE HYDROXYL-GROUPS; CO ADSORPTION; HEMATITE; GOETHITE; NONSTOICHIOMETRY; HYDROHEMATITE; GAMMA-FE2O3; DEFECTS | ||||
| Authors |
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| Affiliations |
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Funding (1)
| 1 | International Science Foundation | RP V000 |
Abstract:
For highly dispersed α-Fe2O3the effect of mechanical activation in the high-powered ball mill under Ar atmosphere on its real structure and reactivity has been studied by using methods sensitive to the bulk (X-ray diffraction, TEM, IR spectroscopy of the lattice vibrations, static magnetic method) as well as to surface properties (SIMS, IR spectroscopy of adsorbed CO and surface hydroxyls, catalytic CO oxidation). Before activation, initial sample was shown to have a rather high density of surface and near-surface extended defects with local spinel structure probably stabilized by admixed sodium ions, while the bulk is free from such disturbances. Cooperative distortion of the lattice (increase of the distance between cation layers and some equalizing of the O–O distances in the anion sublattice) was observed and explained by an effect of the admixed sodium cations in the interstitial positions. Mechanical activation was found to generate anion vacancies in the bulk that was accompanied by a further increase of the distance between cation layers, whereas a mode of relaxation within the anion layers approaches that typical for the perfect hematite. A fall of the density of near-surface extended defects caused by mechanical activation was explained by the glide and/or climb mechanisms and was found to correlate with the decrease of the hematite reactivity.
Cite:
Sadykov V.A.
, Isupova L.A.
, Tsybulya S.V.
, Cherepanova S.V.
, Litvak G.S.
, Burgina E.B.
, Kustova G.N.
, Kolomiichuk V.N.
, Ivanov V.P.
, Paukshtis E.A.
, Golovin A.V.
, Avvakumov E.G.
Effect of Mechanical Activation on the Real Structure and Reactivity of Iron(III) Oxide with Corundum-Type Structure
Journal of Solid State Chemistry. 1996. V.123. N2. P.191-202. DOI: 10.1006/jssc.1996.0168 WOS Scopus РИНЦ ANCAN OpenAlex
Effect of Mechanical Activation on the Real Structure and Reactivity of Iron(III) Oxide with Corundum-Type Structure
Journal of Solid State Chemistry. 1996. V.123. N2. P.191-202. DOI: 10.1006/jssc.1996.0168 WOS Scopus РИНЦ ANCAN OpenAlex
Dates:
| Submitted: | May 25, 1995 |
| Accepted: | Jan 17, 1996 |
| Published print: | May 1, 1996 |
| Published online: | May 25, 2002 |
Identifiers:
| Web of science: | WOS:A1996UW50000002 |
| Scopus: | 2-s2.0-16144368067 |
| Elibrary: | 31341651 |
| Chemical Abstracts: | 1996:341702 |
| Chemical Abstracts (print): | 125:19965 |
| OpenAlex: | W2067896395 |