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

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=773K, 873K, and 973K. The X-ray diffraction and high resolution transmission electron microscopy are used to determine the phase compositio...

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Bibliographic Details
Published in:Materials characterization 2016-10, Vol.120, p.295-303
Main Authors: Luacek, J, ivotsky, O, Jiraskova, Y, Bursik, J, Janos, P
Format: Article
Language:English
Subjects:
ANNEALING
CALCINATION
Cerium oxide
CERIUM OXIDES
Dioxides
FERRITES
GRAIN SIZE
Grain size distribution
HYSTERESIS
IRON OXIDES
Magnetic parameters
MAGNETIC PROPERTIES
MAGNETIZATION
MATERIALS SCIENCE
MOESSBAUER EFFECT
MORPHOLOGY
Mössbauer spectroscopy
Oxide-nano-composites
Phase composition
PHASE TRANSFORMATIONS
RESOLUTION
Sorbents
TEM
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
Transformations
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
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Summary: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=773K, 873K, and 973K. The X-ray diffraction and high resolution transmission electron microscopy are used to determine the phase composition and microstructure morphology. Mössbauer spectroscopy at room (300K) and low (5K) 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. [Display omitted] •Magnetically separable sorbents based on a CeO2/Fe2O3 composite were investigated.•Microstructure of sorbents was determined by XRD, TEM and Mössbauer spectroscopy.•Magnetic properties were studied by hysteresis loops at room- and low-temperatures.•Phase transitions of iron oxides with increasing annealing temperature are observed.
ISSN:1044-5803
1873-4189
DOI:10.1016/j.matchar.2016.09.009