Influence of Sm and Y molar fractions on the properties of electrospun (Fe, Sm) and (Fe, Y) oxides

Robić, Marko; Homonnay, Zoltán; Kuzmann, Ernő; Badica, Petre; Alexandru-Dinu, Andrei; Kuncser, Andrei; Popov, Nina; Krehula, Stjepko; Musić, Svetozar Influence of Sm and Y molar fractions on the properties of electrospun (Fe, Sm) and (Fe, Y) oxides. In: International Symposium on the Industrial Applications of the Mössbauer Effect (11 September 2022 - 16 September 2022) Češka, Olomouc.

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Abstract

Iron oxides (general term for iron-hydroxides, -oxyhydroxides and -oxides) are widespread and abundant in nature. In addition to oxides found in nature, there are also synthetic iron oxides, which are important materials in advanced technologies. Researchers are trying to pronounce some properties of these materials, such as magnetic, electrical, optical, photocatalytic, and other properties. These properties are strongly influenced by nano/microstructure of iron oxides, which mostly depends on the preparation method, as well as by doping with various metal cations. In the present work, we report the phase composition and nano/microstructural changes of the thermal decomposition products of electrospun composite nanofibres of polyvinylpyrrolidone (PVP) and Fe(III)-Sm(III) or Fe(III)-Y(III) nitrate. The thermal decomposition products obtained from electrospun precursor composite fibres were determined using XRPD and 57Fe Mössbauer spectroscopy, while fibre morphology was inspected using FE SEM and TEM. Magnetic properties were studied by 57Fe Mössbauer spectroscopy and SQUID magnetometry. Depending on the Sm and Y molar fractions in (Fe, Sm) and (Fe, Y) oxide systems, as well as calcination temperatures, the following crystal phases were formed: -Fe2O3, -Fe2O3, Sm3Fe5O12, Y3Fe5O12, SmFeO3, YFeO3, Sm2O3 and Y2O3. In the reference sample (containing only Fe3+ cations) the -Fe2O3 phase and minor amount of -Fe2O3 phase were present. The amount of these crystalline phases in electrospun products depended on the Sm and Y molar fractions with a significant decrease in crystallinity in samples containing a higher content of samarium or yttrium.

Item Type:

Unpublished conference/workshop items or lecture materials

Uncontrolled Keywords:

hematite ; samarium oxide ; yttrium oxide ; maghemite ; superparamagnetic maghemite ; electrospinning ; garnet ; orthoferrite

Subjects:

NATURAL SCIENCES > Chemistry > Inorganic Chemistry
NATURAL SCIENCES > Chemistry > Applied Chemistry

Divisions:

Division of Materials Chemistry

Projects: