Pregled bibliografske jedinice broj: 1084026
Influence of Cr doping on the structural, magnetic, optical and photocatalytic properties of α-Fe2O3 nanorods
Influence of Cr doping on the structural, magnetic, optical and photocatalytic properties of α-Fe2O3 nanorods // Journal of physics and chemistry of solids, 148 (2021), 109699, 18 doi:10.1016/j.jpcs.2020.109699 (međunarodna recenzija, članak, znanstveni)
CROSBI ID: 1084026 Za ispravke kontaktirajte CROSBI podršku putem web obrasca
Naslov
Influence of Cr doping on the structural,
magnetic, optical and photocatalytic properties
of α-Fe2O3 nanorods
Autori
Popov, Nina ; Krehula, Stjepko ; Ristić, Mira ; Kuzmann, Ernő ; Homonnay, Zoltán ; Bošković, Marko ; Stanković, Dalibor ; Kubuki, Shiro ; Musić, Svetozar
Izvornik
Journal of physics and chemistry of solids (0022-3697) 148
(2021);
109699, 18
Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni
Ključne riječi
Hematite ; Cr dopant ; Mössbauer spectroscopy ; Morin transition ; Optical band gap
Sažetak
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 Mossbauer ¨ 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+-forFe3+ 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.
Izvorni jezik
Engleski
Znanstvena područja
Kemija
POVEZANOST RADA
Ustanove:
Institut "Ruđer Bošković", Zagreb,
Hrvatska akademija znanosti i umjetnosti
Citiraj ovu publikaciju:
Časopis indeksira:
- Current Contents Connect (CCC)
- Web of Science Core Collection (WoSCC)
- Science Citation Index Expanded (SCI-EXP)
- SCI-EXP, SSCI i/ili A&HCI
- Scopus
