MÖSSBAUER STUDY OF STRUCTURAL–CHEMICAL TRANSFORMATION IN TWO-DIMENSIONAL IRON–OXYGEN NANOSTRUCTURES IN THE COURSE OF TRANSPORT REDUCTION

V. M. Smirnov (), G. P. Voronkov, V. G. Semenov, V. G. Povarov and I. V. Murin
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V. M. Smirnov: Department of Chemistry, St. Petersburg State University, St. Petersburg 198904 , Russia
G. P. Voronkov: Department of Chemistry, St. Petersburg State University, St. Petersburg 198904 , Russia
V. G. Semenov: Department of Chemistry, St. Petersburg State University, St. Petersburg 198904 , Russia
V. G. Povarov: Department of Chemistry, St. Petersburg State University, St. Petersburg 198904 , Russia
I. V. Murin: Department of Chemistry, St. Petersburg State University, St. Petersburg 198904 , Russia

Surface Review and Letters (SRL), 2000, vol. 07, issue 01n02, 1-6

Abstract: Structural–chemical transformations of quasi-two-dimensional iron–oxygen nanostructures occurring at transport reduction were studied using NGR spectroscopy. It has been found that isolated iron–oxygen groups [i.e. groups containing iron and oxygen atoms: ≡Si–O–Fe(OH)2and (≡Si–O–)2–FeOH] forming surface monolayers were not reduced atT = 400–600°Cbecause of their covalent bonding with the silica surface. Reduction of iron oxide microparticles (microstructures) atT ≥ 600°CCresulted in the formation of metal iron in the form of α-Fe. It has been revealed that in the course of transport reduction (TR) of the samples with deposited monolayers (one or four monolayers) atT ≥ 600°Cbulk phases of iron silicate and metal iron were formed. It has also been shown that the features of structural–chemical transformations of supported iron–oxygen nanolayers were in relation with the specific character of phase formation within nanoscale structures.

Date: 2000
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DOI: 10.1142/S0218625X00000026

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