TY  - JOUR
AU  - Popov, Nina
AU  - Bošković, Marko
AU  - Perović, Marija
AU  - Zadro, Krešo
AU  - Gilja, Vanja
AU  - Kratofil Krenula, Ljerka
AU  - Robić, Marko
AU  - Marijan, Marciuš
AU  - Ristić, Mira
AU  - Musić, Svetozar
AU  - Stanković, Dalibor
AU  - Krehula, Stjepko
PY  - 2021
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/4816
AB  - Nanosized hematite (α-Fe2O3) is a widely investigated material due to its favourable properties (chemically stable, environmentally safe, inexpensive) and very good performance in several advanced applications. Properties and performance of hematite nanoparticles can be adjusted and improved by modification of particle size and shape, as well as by substitution of Fe3+ ions in the crystal structure of hematite with other metal ions. Ru3+ ions are potentially suitable metal ions for the substitution of Fe3+ ions in hematite because of the same charge and similar ionic radii. In the present work, the effects of Ru3+ ions on the formation and properties of hematite nanorods prepared by combination of hydrothermal precipitation and calcination were investigated. The influence of the molar fraction of Ru3+ ions in the hydrothermal precipitation system on the formation and properties of iron oxide phases was studied. Single-phase goethite (α-FeOOH) nanorods containing incorporated Ru3+ ions were formed in the presence of low levels of Ru3+ ions (<3 mol%), while at higher levels (4 and 5 mol% Ru) hematite nanocylinders, consisting of self-assembled and fused nanoparticles, were obtained. The mechanism of the formation of these iron oxide nanostructures in the presence of Ru3+ ions was explained and compared with the effect of other metal cations reported in the literature. Ru-doped hematite nanorods were formed after calcination of Ru-doped goethite nanorods at 500 °C. A gradual elongation of hematite nanorods with increased Ru doping to highly elongated Ru-doped hematite nanoneedles at 2 mol% Ru was observed and explained. The influence of the Ru doping level on the magnetic properties of hematite nanorods was investigated using Mössbauer spectroscopy and magnetic measurements. Temperature of the transition between antiferromagnetic (AFM) and weakly ferromagnetic (WFM) spin ordering state (Morin transition) gradually rose with increasing Ru3+-for-Fe3+ substitution in hematite. Besides, magnetization of the WFM hematite gradually decreased with Ru doping which was attributed to the reduced canting of two almost antiparallel spin sublattices in this phase. The optical band gap in hematite nanorods was found to get gradually narrower with increased Ru doping due to the modified electronic structure.
PB  - Elsevier
T2  - Journal of magnetism and magnetic materials
T1  - Effect of Ru3+ ions on the formation, structural, magnetic and optical properties of hematite (α-Fe2O3) nanorods
VL  - 538
SP  - 168316
EP  - 168321
DO  - 10.1016/j.jmmm.2021.168316
ER  - 

@article{
author = "Popov, Nina and Bošković, Marko and Perović, Marija and Zadro, Krešo and Gilja, Vanja and Kratofil Krenula, Ljerka and Robić, Marko and Marijan, Marciuš and Ristić, Mira and Musić, Svetozar and Stanković, Dalibor and Krehula, Stjepko",
year = "2021",
abstract = "Nanosized hematite (α-Fe2O3) is a widely investigated material due to its favourable properties (chemically stable, environmentally safe, inexpensive) and very good performance in several advanced applications. Properties and performance of hematite nanoparticles can be adjusted and improved by modification of particle size and shape, as well as by substitution of Fe3+ ions in the crystal structure of hematite with other metal ions. Ru3+ ions are potentially suitable metal ions for the substitution of Fe3+ ions in hematite because of the same charge and similar ionic radii. In the present work, the effects of Ru3+ ions on the formation and properties of hematite nanorods prepared by combination of hydrothermal precipitation and calcination were investigated. The influence of the molar fraction of Ru3+ ions in the hydrothermal precipitation system on the formation and properties of iron oxide phases was studied. Single-phase goethite (α-FeOOH) nanorods containing incorporated Ru3+ ions were formed in the presence of low levels of Ru3+ ions (<3 mol%), while at higher levels (4 and 5 mol% Ru) hematite nanocylinders, consisting of self-assembled and fused nanoparticles, were obtained. The mechanism of the formation of these iron oxide nanostructures in the presence of Ru3+ ions was explained and compared with the effect of other metal cations reported in the literature. Ru-doped hematite nanorods were formed after calcination of Ru-doped goethite nanorods at 500 °C. A gradual elongation of hematite nanorods with increased Ru doping to highly elongated Ru-doped hematite nanoneedles at 2 mol% Ru was observed and explained. The influence of the Ru doping level on the magnetic properties of hematite nanorods was investigated using Mössbauer spectroscopy and magnetic measurements. Temperature of the transition between antiferromagnetic (AFM) and weakly ferromagnetic (WFM) spin ordering state (Morin transition) gradually rose with increasing Ru3+-for-Fe3+ substitution in hematite. Besides, magnetization of the WFM hematite gradually decreased with Ru doping which was attributed to the reduced canting of two almost antiparallel spin sublattices in this phase. The optical band gap in hematite nanorods was found to get gradually narrower with increased Ru doping due to the modified electronic structure.",
publisher = "Elsevier",
journal = "Journal of magnetism and magnetic materials",
title = "Effect of Ru3+ ions on the formation, structural, magnetic and optical properties of hematite (α-Fe2O3) nanorods",
volume = "538",
pages = "168316-168321",
doi = "10.1016/j.jmmm.2021.168316"
}

Popov, N., Bošković, M., Perović, M., Zadro, K., Gilja, V., Kratofil Krenula, L., Robić, M., Marijan, M., Ristić, M., Musić, S., Stanković, D.,& Krehula, S.. (2021). Effect of Ru3+ ions on the formation, structural, magnetic and optical properties of hematite (α-Fe2O3) nanorods. in Journal of magnetism and magnetic materials
Elsevier., 538, 168316-168321.
https://doi.org/10.1016/j.jmmm.2021.168316

Popov N, Bošković M, Perović M, Zadro K, Gilja V, Kratofil Krenula L, Robić M, Marijan M, Ristić M, Musić S, Stanković D, Krehula S. Effect of Ru3+ ions on the formation, structural, magnetic and optical properties of hematite (α-Fe2O3) nanorods. in Journal of magnetism and magnetic materials. 2021;538:168316-168321.
doi:10.1016/j.jmmm.2021.168316 .

Popov, Nina, Bošković, Marko, Perović, Marija, Zadro, Krešo, Gilja, Vanja, Kratofil Krenula, Ljerka, Robić, Marko, Marijan, Marciuš, Ristić, Mira, Musić, Svetozar, Stanković, Dalibor, Krehula, Stjepko, "Effect of Ru3+ ions on the formation, structural, magnetic and optical properties of hematite (α-Fe2O3) nanorods" in Journal of magnetism and magnetic materials, 538 (2021):168316-168321,
https://doi.org/10.1016/j.jmmm.2021.168316 . .

TY  - DATA
AU  - Popov, Nina
AU  - Bošković, Marko
AU  - Perović, Marija
AU  - Zadro, Krešo
AU  - Gilja, Vanja
AU  - Kratofil Krenula, Ljerka
AU  - Robić, Marko
AU  - Marijan, Marciuš
AU  - Ristić, Mira
AU  - Musić, Svetozar
AU  - Stanković, Dalibor
AU  - Krehula, Stjepko
PY  - 2021
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/4817
PB  - Elsevier
T2  - Journal of magnetism and magnetic materials
T1  - Supplementary data for the article: Popov, N.; Bošković, M.; Perović, M.; Zadro, K.; Gilja, V.; Kratofil Krehula, L.; Robić, M.; Marciuš, M.; Ristić, M.; Musić, S.; Stanković, D.; Krehula, S. Effect of Ru3+ Ions on the Formation, Structural, Magnetic and Optical Properties of Hematite (α-Fe2O3) Nanorods. Journal of Magnetism and Magnetic Materials 2021, 538, 168316. https://doi.org/10.1016/j.jmmm.2021.168316.
UR  - https://hdl.handle.net/21.15107/rcub_cherry_4817
ER  - 

@misc{
author = "Popov, Nina and Bošković, Marko and Perović, Marija and Zadro, Krešo and Gilja, Vanja and Kratofil Krenula, Ljerka and Robić, Marko and Marijan, Marciuš and Ristić, Mira and Musić, Svetozar and Stanković, Dalibor and Krehula, Stjepko",
year = "2021",
publisher = "Elsevier",
journal = "Journal of magnetism and magnetic materials",
title = "Supplementary data for the article: Popov, N.; Bošković, M.; Perović, M.; Zadro, K.; Gilja, V.; Kratofil Krehula, L.; Robić, M.; Marciuš, M.; Ristić, M.; Musić, S.; Stanković, D.; Krehula, S. Effect of Ru3+ Ions on the Formation, Structural, Magnetic and Optical Properties of Hematite (α-Fe2O3) Nanorods. Journal of Magnetism and Magnetic Materials 2021, 538, 168316. https://doi.org/10.1016/j.jmmm.2021.168316.",
url = "https://hdl.handle.net/21.15107/rcub_cherry_4817"
}

Popov, N., Bošković, M., Perović, M., Zadro, K., Gilja, V., Kratofil Krenula, L., Robić, M., Marijan, M., Ristić, M., Musić, S., Stanković, D.,& Krehula, S.. (2021). Supplementary data for the article: Popov, N.; Bošković, M.; Perović, M.; Zadro, K.; Gilja, V.; Kratofil Krehula, L.; Robić, M.; Marciuš, M.; Ristić, M.; Musić, S.; Stanković, D.; Krehula, S. Effect of Ru3+ Ions on the Formation, Structural, Magnetic and Optical Properties of Hematite (α-Fe2O3) Nanorods. Journal of Magnetism and Magnetic Materials 2021, 538, 168316. https://doi.org/10.1016/j.jmmm.2021.168316.. in Journal of magnetism and magnetic materials
Elsevier..
https://hdl.handle.net/21.15107/rcub_cherry_4817

Popov N, Bošković M, Perović M, Zadro K, Gilja V, Kratofil Krenula L, Robić M, Marijan M, Ristić M, Musić S, Stanković D, Krehula S. Supplementary data for the article: Popov, N.; Bošković, M.; Perović, M.; Zadro, K.; Gilja, V.; Kratofil Krehula, L.; Robić, M.; Marciuš, M.; Ristić, M.; Musić, S.; Stanković, D.; Krehula, S. Effect of Ru3+ Ions on the Formation, Structural, Magnetic and Optical Properties of Hematite (α-Fe2O3) Nanorods. Journal of Magnetism and Magnetic Materials 2021, 538, 168316. https://doi.org/10.1016/j.jmmm.2021.168316.. in Journal of magnetism and magnetic materials. 2021;.
https://hdl.handle.net/21.15107/rcub_cherry_4817 .

Popov, Nina, Bošković, Marko, Perović, Marija, Zadro, Krešo, Gilja, Vanja, Kratofil Krenula, Ljerka, Robić, Marko, Marijan, Marciuš, Ristić, Mira, Musić, Svetozar, Stanković, Dalibor, Krehula, Stjepko, "Supplementary data for the article: Popov, N.; Bošković, M.; Perović, M.; Zadro, K.; Gilja, V.; Kratofil Krehula, L.; Robić, M.; Marciuš, M.; Ristić, M.; Musić, S.; Stanković, D.; Krehula, S. Effect of Ru3+ Ions on the Formation, Structural, Magnetic and Optical Properties of Hematite (α-Fe2O3) Nanorods. Journal of Magnetism and Magnetic Materials 2021, 538, 168316. https://doi.org/10.1016/j.jmmm.2021.168316." in Journal of magnetism and magnetic materials (2021),
https://hdl.handle.net/21.15107/rcub_cherry_4817 .

TY  - JOUR
AU  - Popov, Nina
AU  - Krehula, Stjepko
AU  - Ristić, Mira
AU  - Kuzmann, Ernő
AU  - Homonnay, Zoltán
AU  - Bošković, Marko
AU  - Stanković, Dalibor
AU  - Kubuki, Shiro
AU  - Musić, Svetozar
PY  - 2021
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/4055
AB  - Pure and Cr-doped hematite (α-(Fe1-xCrx)2O3, x = 0, 0.026, 0.039, 0.085 or 0.135) nanorods were prepared by a simple co-precipitation and calcination method. Influence of different levels of Cr doping on the change of properties of long and thin pure hematite nanorods was investigated. Cr3+-for-Fe3+ substitution in the crystal structure of hematite was proved by measuring a gradual contraction of the unit cell and a gradual decrease of the hyperfine magnetic field by increasing the Cr molar fraction. Cr doping induced an increase in the width and thickness of hematite nanorods, as well as a decrease in the overall surface area. Low temperature 57Fe Mössbauer spectroscopy showed that the Morin transition in hematite was suppressed by Cr doping to temperatures below 80 K. Magnetic measurements confirmed the suppression of the Morin transition in Cr-doped hematite down to 5 K. Infrared spectra of Cr-doped hematite samples showed shifts of IR bands by Cr3+-for-Fe3+ substitution. Optical properties of α-Fe2O3 nanorods changed significantly by Cr doping – the absorption edge was shifted to higher wavelengths, accompanied by a greater absorption in the visible range and narrowed direct and indirect optical band gaps. The improved visible light photocatalytic activity of hematite nanorods in the heterogeneous photo-Fenton process by moderate Cr doping was measured, which can be attributed to the modifications in electronic structure and optical properties.
PB  - Elsevier
T2  - Journal of Physics and Chemistry of Solids
T2  - Journal of Physics and Chemistry of SolidsJournal of Physics and Chemistry of Solids
T1  - Influence of Cr doping on the structural, magnetic, optical and photocatalytic properties of α-Fe2O3 nanorods
VL  - 148
SP  - 109699
DO  - 10.1016/j.jpcs.2020.109699
ER  - 

@article{
author = "Popov, Nina and Krehula, Stjepko and Ristić, Mira and Kuzmann, Ernő and Homonnay, Zoltán and Bošković, Marko and Stanković, Dalibor and Kubuki, Shiro and Musić, Svetozar",
year = "2021",
abstract = "Pure and Cr-doped hematite (α-(Fe1-xCrx)2O3, x = 0, 0.026, 0.039, 0.085 or 0.135) nanorods were prepared by a simple co-precipitation and calcination method. Influence of different levels of Cr doping on the change of properties of long and thin pure hematite nanorods was investigated. Cr3+-for-Fe3+ substitution in the crystal structure of hematite was proved by measuring a gradual contraction of the unit cell and a gradual decrease of the hyperfine magnetic field by increasing the Cr molar fraction. Cr doping induced an increase in the width and thickness of hematite nanorods, as well as a decrease in the overall surface area. Low temperature 57Fe Mössbauer spectroscopy showed that the Morin transition in hematite was suppressed by Cr doping to temperatures below 80 K. Magnetic measurements confirmed the suppression of the Morin transition in Cr-doped hematite down to 5 K. Infrared spectra of Cr-doped hematite samples showed shifts of IR bands by Cr3+-for-Fe3+ substitution. Optical properties of α-Fe2O3 nanorods changed significantly by Cr doping – the absorption edge was shifted to higher wavelengths, accompanied by a greater absorption in the visible range and narrowed direct and indirect optical band gaps. The improved visible light photocatalytic activity of hematite nanorods in the heterogeneous photo-Fenton process by moderate Cr doping was measured, which can be attributed to the modifications in electronic structure and optical properties.",
publisher = "Elsevier",
journal = "Journal of Physics and Chemistry of Solids, Journal of Physics and Chemistry of SolidsJournal of Physics and Chemistry of Solids",
title = "Influence of Cr doping on the structural, magnetic, optical and photocatalytic properties of α-Fe2O3 nanorods",
volume = "148",
pages = "109699",
doi = "10.1016/j.jpcs.2020.109699"
}

Popov, N., Krehula, S., Ristić, M., Kuzmann, E., Homonnay, Z., Bošković, M., Stanković, D., Kubuki, S.,& Musić, S.. (2021). Influence of Cr doping on the structural, magnetic, optical and photocatalytic properties of α-Fe2O3 nanorods. in Journal of Physics and Chemistry of Solids
Elsevier., 148, 109699.
https://doi.org/10.1016/j.jpcs.2020.109699

Popov N, Krehula S, Ristić M, Kuzmann E, Homonnay Z, Bošković M, Stanković D, Kubuki S, Musić S. Influence of Cr doping on the structural, magnetic, optical and photocatalytic properties of α-Fe2O3 nanorods. in Journal of Physics and Chemistry of Solids. 2021;148:109699.
doi:10.1016/j.jpcs.2020.109699 .

Popov, Nina, Krehula, Stjepko, Ristić, Mira, Kuzmann, Ernő, Homonnay, Zoltán, Bošković, Marko, Stanković, Dalibor, Kubuki, Shiro, Musić, Svetozar, "Influence of Cr doping on the structural, magnetic, optical and photocatalytic properties of α-Fe2O3 nanorods" in Journal of Physics and Chemistry of Solids, 148 (2021):109699,
https://doi.org/10.1016/j.jpcs.2020.109699 . .

TY  - JOUR
AU  - Popov, Nina
AU  - Bošković, Marko
AU  - Perović, Marija
AU  - Németh, Zoltán
AU  - Wang, Junhu
AU  - Kuang, Zhichong
AU  - Reissner, Michael
AU  - Kuzmann, Ernő
AU  - Homonnay, Zoltán
AU  - Kubuki, Shiro
AU  - Marciuš, Marijan
AU  - Ristić, Mira
AU  - Musić, Svetozar
AU  - Stanković, Dalibor
AU  - Krehula, Stjepko
PY  - 2021
UR  - https://www.sciencedirect.com/science/article/pii/S0022369720328298
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/4457
AB  - Pure hematite nanorods and very long and thin cobalt-doped hematite nanorods (nanoneedles) were prepared by a combined precipitation and annealing method. The influence of the level of cobalt doping on different properties of hematite nanorods was investigated. Incorporation of cobalt in the form of low-spin Co3+ ions into the structure of hematite by substitution for high-spin Fe3+ ions was proved by determination of a significant unit cell contraction by powder X-ray diffraction (PXRD) and characteristic positions of the absorption edge in X-ray absorption near edge structure (XANES) spectra and peaks in X-ray emission (XES) spectra. Cobalt doping caused a gradual elongation and thinning of hematite nanorods – very long and thin 1D nanoparticles (nanoneedles) were formed in the presence of 10 and 12 mol% Co. Magnetic measurements showed a strong increase in low-temperature remanent magnetization and coercivity upon cobalt doping, as well as a disappearance of the Morin transition, which was also confirmed by Mössbauer spectroscopy. Cobalt doping significantly affected optical properties of hematite nanorods – absorption in the visible and NIR ranges increased, which was accompanied by narrowing of the optical band gap. Compared with pure hematite nanorods cobalt-doped hematite nanoneedles showed a significantly better electrocatalytic activity for the oxygen evolution reaction (OER).
PB  - Elsevier
T2  - Journal of Physics and Chemistry of Solids
T2  - Journal of Physics and Chemistry of SolidsJournal of Physics and Chemistry of Solids
T1  - Influence of low-spin Co3+ for high-spin Fe3+ substitution on the structural, magnetic, optical and catalytic properties of hematite (α-Fe2O3) nanorods
VL  - 152
SP  - 109929
DO  - 10.1016/j.jpcs.2020.109929
ER  - 

@article{
author = "Popov, Nina and Bošković, Marko and Perović, Marija and Németh, Zoltán and Wang, Junhu and Kuang, Zhichong and Reissner, Michael and Kuzmann, Ernő and Homonnay, Zoltán and Kubuki, Shiro and Marciuš, Marijan and Ristić, Mira and Musić, Svetozar and Stanković, Dalibor and Krehula, Stjepko",
year = "2021",
abstract = "Pure hematite nanorods and very long and thin cobalt-doped hematite nanorods (nanoneedles) were prepared by a combined precipitation and annealing method. The influence of the level of cobalt doping on different properties of hematite nanorods was investigated. Incorporation of cobalt in the form of low-spin Co3+ ions into the structure of hematite by substitution for high-spin Fe3+ ions was proved by determination of a significant unit cell contraction by powder X-ray diffraction (PXRD) and characteristic positions of the absorption edge in X-ray absorption near edge structure (XANES) spectra and peaks in X-ray emission (XES) spectra. Cobalt doping caused a gradual elongation and thinning of hematite nanorods – very long and thin 1D nanoparticles (nanoneedles) were formed in the presence of 10 and 12 mol% Co. Magnetic measurements showed a strong increase in low-temperature remanent magnetization and coercivity upon cobalt doping, as well as a disappearance of the Morin transition, which was also confirmed by Mössbauer spectroscopy. Cobalt doping significantly affected optical properties of hematite nanorods – absorption in the visible and NIR ranges increased, which was accompanied by narrowing of the optical band gap. Compared with pure hematite nanorods cobalt-doped hematite nanoneedles showed a significantly better electrocatalytic activity for the oxygen evolution reaction (OER).",
publisher = "Elsevier",
journal = "Journal of Physics and Chemistry of Solids, Journal of Physics and Chemistry of SolidsJournal of Physics and Chemistry of Solids",
title = "Influence of low-spin Co3+ for high-spin Fe3+ substitution on the structural, magnetic, optical and catalytic properties of hematite (α-Fe2O3) nanorods",
volume = "152",
pages = "109929",
doi = "10.1016/j.jpcs.2020.109929"
}

Popov, N., Bošković, M., Perović, M., Németh, Z., Wang, J., Kuang, Z., Reissner, M., Kuzmann, E., Homonnay, Z., Kubuki, S., Marciuš, M., Ristić, M., Musić, S., Stanković, D.,& Krehula, S.. (2021). Influence of low-spin Co3+ for high-spin Fe3+ substitution on the structural, magnetic, optical and catalytic properties of hematite (α-Fe2O3) nanorods. in Journal of Physics and Chemistry of Solids
Elsevier., 152, 109929.
https://doi.org/10.1016/j.jpcs.2020.109929

Popov N, Bošković M, Perović M, Németh Z, Wang J, Kuang Z, Reissner M, Kuzmann E, Homonnay Z, Kubuki S, Marciuš M, Ristić M, Musić S, Stanković D, Krehula S. Influence of low-spin Co3+ for high-spin Fe3+ substitution on the structural, magnetic, optical and catalytic properties of hematite (α-Fe2O3) nanorods. in Journal of Physics and Chemistry of Solids. 2021;152:109929.
doi:10.1016/j.jpcs.2020.109929 .

Popov, Nina, Bošković, Marko, Perović, Marija, Németh, Zoltán, Wang, Junhu, Kuang, Zhichong, Reissner, Michael, Kuzmann, Ernő, Homonnay, Zoltán, Kubuki, Shiro, Marciuš, Marijan, Ristić, Mira, Musić, Svetozar, Stanković, Dalibor, Krehula, Stjepko, "Influence of low-spin Co3+ for high-spin Fe3+ substitution on the structural, magnetic, optical and catalytic properties of hematite (α-Fe2O3) nanorods" in Journal of Physics and Chemistry of Solids, 152 (2021):109929,
https://doi.org/10.1016/j.jpcs.2020.109929 . .