Thermally stimulated iron oxide transformations and magnetic behaviour of cerium dioxide/iron oxide reactive sorbents

0463461 - ÚFM 2017 RIV US eng J - Journal Article
Luňáček, J. - Životský, O. - Jirásková, Yvonna - Buršík, Jiří - Janoš, P.
Thermally stimulated iron oxide transformations and magnetic behaviour of cerium dioxide/iron oxide reactive sorbents.
Materials Characterization. Roč. 120, OCT (2016), s. 295-303. ISSN 1044-5803. E-ISSN 1873-4189
R&D Projects: GA MŠMT(CZ) LQ1601
Institutional support: RVO:68081723
Keywords : Oxide-nano-composites * Mössbauer spectroscopy * TEM * Cerium oxide * Magnetic parameters
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 2.714, year: 2016

The present paper is devoted to detailed study of the magnetically separable sorbents based on a cerium dioxide/iron oxide composite annealed at temperatures Ta = 773 K, 873 K, and 973 K. The X-ray diffraction and high resolution transmission electron microscopy are used to determine the phase composition and microstructure morphology. Mössbauer spectroscopy at room (300 K) and low (5 K) temperatures has contributed to more exact identification of iron oxides and their transformations Fe3O4 → γ-Fe2O3 (ε-Fe2O3) → α-Fe2O3 in dependence on calcination temperature. Different iron oxide phase compositions and grain size distributions influence the magnetic characteristics determined from the room- and low-temperature hysteresis loop measurements. The results are supported by zero-field-cooled and field-cooled magnetization measurements allowing a quantitative estimation of the grain size distribution and its effect on the iron oxide transformations.
Permanent Link: http://hdl.handle.net/11104/0262708