The relationship between magnetic behaviour and local structure around Fe ions in Fe-doped TiO2 rutile

2009 ◽  
Vol 404 (18) ◽  
pp. 2838-2840 ◽  
Author(s):  
A.M. Mudarra Navarro ◽  
V. Bilovol ◽  
A.F. Cabrera ◽  
C.E. Rodríguez Torres ◽  
F.H. Sánchez
Keyword(s):  
Local Structure ◽  
Magnetic Behaviour ◽  
Doped Tio2 ◽  
The Relationship ◽  
Tio2 Rutile ◽  
Fe Ions

scholarly journals The Study of Magnetic Properties for Non-Magnetic Ions Doped BiFeO3

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4061
Author(s):  
Yongtao Li ◽  
Liqing Liu ◽  
Dehao Wang ◽  
Hongguang Zhang ◽  
Xuemin He ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Local Structure ◽  
Metal Ion ◽  
Single Phase ◽  
Sol Gel ◽  
X Ray ◽  
Co Doping ◽  
Magnetic Ions ◽  
X Ray Absorption ◽  
Fe Ions

BiFeO3 is considered as a single phase multiferroic. However, its magnetism is very weak. We study the magnetic properties of BiFeO3 by Cu and (Cu, Zn). Polycrystalline samples Bi(Fe0.95Cu0.05)O3 and BiFe0.95(Zn0.025Cu0.025)O3 are prepared by the sol-gel method. The magnetic properties of BiFe0.95(Zn0.025Cu0.025)O3 are greater than that of BiFeO3 and Bi(Fe0.95Cu0.05)O3. The analyses of X-ray absorption fine structure data show that the doped Cu atoms well occupy the sites of the Fe atoms. X-ray absorption near edge spectra data confirm that the valence state of Fe ions does not change. Cu and Zn metal ion co-doping has no impact on the local structure of the Fe and Bi atoms. The modification of magnetism by doping Zn can be understood by the view of the occupation site of non-magnetically active Zn2+.

The influence of the local structure of Fe(III) on the photocatalytic activity of doped TiO2 photocatalysts—An EXAFS, XPS and Mössbauer spectroscopic study

2011 ◽  
Vol 103 (1-2) ◽  
pp. 232-239 ◽  
Author(s):  
Éva G. Bajnóczi ◽  
Nándor Balázs ◽  
Károly Mogyorósi ◽  
Dávid F. Srankó ◽  
Zsolt Pap ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Spectroscopic Study ◽  
Local Structure ◽  
Tio2 Photocatalysts ◽  
Doped Tio2

scholarly journals Ferromagnetic Properties of N-Doped and Undoped TiO2 Rutile Single-Crystal Wafers with Addition of Tungsten Trioxide

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 1934 ◽  
Author(s):  
Jing Xu ◽  
Haiying Wang ◽  
Zhongpo Zhou ◽  
Zhaorui Zou
Keyword(s):  
Magnetic Properties ◽  
Single Crystal ◽  
Saturation Magnetization ◽  
Photoelectron Spectroscopy ◽  
Oxygen Vacancies ◽  
Tio2 Surface ◽  
Doped Tio2 ◽  
X Ray ◽  
N Doping ◽  
Tio2 Rutile

In this work, undoped, N-doped, WO3-loaded undoped, and WO3-loaded with N-doped TiO2 rutile single-crystal wafers were fabricated by direct current (DC) magnetron sputtering. N-doping into TiO2 and WO3 loading onto TiO2 surface were used to increase and decrease oxygen vacancies. Various measurements were conducted to analyze the structural and magnetic properties of the samples. X-ray diffraction results showed that the N-doping and WO3 loading did not change the phase of all samples. X-ray photoelectron spectroscopy results revealed that W element loaded onto rutile single-crystal wafers existed in the form of WO3. UV-Vis spectrometer results showed that the absorption edge of WO3-loaded undoped and WO3-loaded with N-doped TiO2 rutile single-crystal wafers had red shift, resulting in a slight decrease in the corresponding band gap. Photoluminescence spectra indicated that oxygen vacancies existed in all samples due to the postannealing atmosphere, and oxygen vacancies density increased with N-doping, while decreasing with WO3 loading onto TiO2 surface. The magnetic properties of the samples were investigated, and the saturation magnetization values were in the order N-doped > WO3-loaded with N-doped > undoped > WO3-loaded undoped rutile single-crystal wafers, which was the same order as the oxygen vacancy densities of these samples. N-doping improved the saturation magnetization values, while WO3-loaded decreased the saturation magnetization values. This paper reveals that the magnetic properties of WO3-loaded with N-doped rutile single-crystal wafers originate from oxygen vacancies.

Local structure around Fe ions on multiferroic Pb(Fe1/2Nb1/2)O3 ceramics probed by x-ray absorption spectroscopy

2012 ◽  
Vol 100 (17) ◽  
pp. 172907 ◽  
Author(s):  
A. Mesquita ◽  
B. M. Fraygola ◽  
V. R. Mastelaro ◽  
J. A. Eiras
Keyword(s):  
Absorption Spectroscopy ◽  
Local Structure ◽  
X Ray ◽  
X Ray Absorption ◽  
Fe Ions

scholarly journals Structural Analysis of the BaWO4 Crystal Doped with Ce and Codoped with Na Ions Based on g-shift Parameters

Crystals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 789 ◽  
Author(s):  
Tomasz Bodziony ◽  
Slawomir Maksymilian Kaczmarek
Keyword(s):  
Structural Analysis ◽  
Local Structure ◽  
Perturbation Methods ◽  
Superposition Model ◽  
Shift Method ◽  
Impurity Ions ◽  
Na Ions ◽  
Paramagnetic Ions ◽  
The Relationship ◽  
Good Agreement

The relationship between the g-shift and the local structure of the Ce3+ paramagnetic center with axial symmetry were investigated for four BaWO4 single crystals doped with Ce and codoped with Na. Based on g-shift the displacements of Ce3+ ions are determined. The g-shift method yields displacements of impurity ions in good agreement with the superposition model (SPM) and the perturbation methods (PM) predictions. The structural analysis of the paramagnetic ions and its surrounding in the BaWO4 unit cell was also conducted.

scholarly journals The relationship between local structure and photo-Fenton catalytic ability of glasses and glass-ceramics prepared from Japanese slag

2019 ◽  
Vol 322 (2) ◽  
pp. 751-761 ◽  
Author(s):  
Ahmed S. Ali ◽  
Kiyoshi Nomura ◽  
Zoltan Homonnay ◽  
Erno Kuzmann ◽  
Alex Scrimshire ◽  
...  
Keyword(s):  
Local Structure ◽  
Glass Ceramics ◽  
The Relationship

Structural and electrical properties of Li-doped TiO2 rutile ceramics

2015 ◽  
Vol 41 (5) ◽  
pp. 6281-6285 ◽  
Author(s):  
Román Alvarez Roca ◽  
Fidel Guerrero ◽  
José A. Eiras ◽  
J.D.S. Guerra
Keyword(s):  
Electrical Properties ◽  
Doped Tio2 ◽  
Structural And Electrical Properties ◽  
Tio2 Rutile
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