SOLID STATE SYNTHESIS OF IRON(III) OXIDE POLYMORPHS FROM PRUSSIAN BLUE WITH DIFFERENT MORPHOLOGY

1 APARICIO Claudia
Co-authors:
1 TUČEK Jiří 1 FILIP Jan 1 MACHALA Libor
Institution:
1 Regional Centre of Advanced Technologies and Materials (RCPTM), Department of Experimental Physics, Faculty of Science, Palacky University, 17. listopadu 1192/12, 77146 Olomouc, Czech Republic, claudia.aparicio@upol.cz, jiri.tucek@upol.cz, jan.filip@upol.cz, libor.machala@upol.cz
Conference:
10th International Conference on Nanomaterials - Research & Application, Hotel Voronez I, Brno, Czech Republic, EU, October 17th - 19th 2018
Proceedings:
Proceedings 10th International Conference on Nanomaterials - Research & Application
Pages:
659-664
ISBN:
978-80-87294-89-5
ISSN:
2694-930X
Published:
28th February 2019
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
79 views / 21 downloads
Abstract

Two Prussian blue (PB) samples with different morphologies (spheres, mean size 160 nm; cubes, mean size 1.48 μm) and variable content of potassium (K-free and K-bearing) were used as a precursor material for the preparation of iron(III) oxides by solid state thermal decomposition method. A mixture of iron(III) oxide polymorphs (α-Fe2O3, β-Fe2O3, and γ-Fe2O3 nanoparticles) or pure maghemite (γ-Fe2O3 nanoparticles) were obtained by thermal decomposition of the cubic (K-bearing) or spherical (K-free) PB particles, respectively, at 350 °C in air. The particle’s morphology of the starting material (i.e. PB) was mostly retained after the thermal decomposition. The PB samples and the as-formed iron(III) oxides were characterized by using X-ray powder diffraction (XRD), 57Fe Mössbauer spectroscopy, and scanning electron microscopy (SEM). A high amount (50 wt%) of β-Fe2O3 polymorph was produced when K-bearing PB was used, simultaneously cubic clusters of maghemite were formed. A single phase (maghemite) clustered nanoparticles with spherical morphology were obtained when we used a K-free PB. The maghemite nanoparticles (4 nm) have proven to be superparamagnetic.

Keywords: Thermal decomposition, Prussian blue, iron oxides

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