Substitutional site and defect structure of Ni2+in LiNbO3crystal studied from the optical and electron paramagnetic resonance spectra

2008 ◽  
Vol 163 (1) ◽  
pp. 29-34 ◽  
Author(s):  
Wen-Lin Feng ◽  
Xiao-Xuan Wu ◽  
Wen-Chen Zheng
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Defect Structure ◽  
Paramagnetic Resonance ◽  
Substitutional Site ◽  
Electron Paramagnetic

Theoretical Studies on the Gyromagnetic Factors and the Hyperfine Structure Constants for the Tetragonal Copper Center in KTaO3

2005 ◽  
Vol 60 (8-9) ◽  
pp. 615-618 ◽  
Author(s):  
Hui-Ning Dong
Keyword(s):  
Experimental Data ◽  
Electron Paramagnetic Resonance ◽  
Hyperfine Structure ◽  
Defect Structure ◽  
Electrostatic Repulsion ◽  
Theoretical Studies ◽  
Paramagnetic Resonance ◽  
Copper Center ◽  
Structure Constants ◽  
Electron Paramagnetic

The gyromagnetic factors g∥, g⊥ and the hyperfine structure constants A∥ and A⊥ of the tetragonal Cu2+ center in KTaO3 are theoretically studied in this work. Based on the analyses of the electron paramagnetic resonance results of this center, it is found that the impurity Cu2+ occupies the octahedral Ta5+ site, associated with a nearest-neighbouring oxygen vacancy VO along the C4 axis. Due to the electrostatic repulsion of VO, Cu2+ is displaced away from VO by ΔZ(≈ −0.29 Å ) along the C4 axis. The theoretical values of the g and A factors based on the above defect structure and the impurity displacement agreee reasonably with the experimental data.

scholarly journals An EPR Investigation of Defect Structure and Electron Transfer Mechanism in Mixed-Conductive LiBO2-V2O5 Glasses

2021 ◽  
Author(s):  
Jacob N. Spencer ◽  
Andrea Folli ◽  
Hong Ren ◽  
Damien M. Murphy
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Electron Transfer ◽  
Epr Spectroscopy ◽  
Defect Structure ◽  
Continuous Wave ◽  
Transfer Mechanism ◽  
Paramagnetic Resonance ◽  
Electron Transfer Mechanism ◽  
Electron Paramagnetic

Continuous Wave (CW) Electron Paramagnetic Resonance (EPR) spectroscopy was used to study the defect structure and electron transfer mechanism in a series of LiBO2-V2O5 mixed conductive glasses of varying V2O5...

Defect Structure of Nanosized Zirconium Oxide Powders Doped with Y2O3, Sc2O3, Cr2O3

2013 ◽  
Vol 200 ◽  
pp. 108-113
Author(s):  
Lesya P. Yurchenko ◽  
Igor P. Bykov ◽  
Alexander B. Brik ◽  
Oleksandr D. Vasylyev ◽  
Valeriy G. Vereschak ◽  
...  
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Zirconium Oxide ◽  
Defect Structure ◽  
Formation Mechanisms ◽  
Paramagnetic Centers ◽  
Thermal Generation ◽  
Paramagnetic Resonance ◽  
Temperature Range ◽  
Oxide Powders ◽  
Electron Paramagnetic

The formation mechanisms of paramagnetic centers originating from Zr3+ and Cr3+ ions and the influence of the nanoparticle composition on thermal generation processes of these paramagnetic centers in ZrO2 structure were studied by electron paramagnetic resonance. A set of nanosized zirconium oxide powders (nominally pure ZrO2, ZrO2 doped with correspondingly Y2O3 and Sc2O3, Cr2O3 and Y2O3, as well as Cr2O3) was investigated: The influence of annealing on the EPR lines of Zr3+ and Cr5+ ions was found to be different. Annealing curves of EPR signals caused by Cr5+ ions have a maximum in temperature range 500–600 °C. Mechanisms of Zr3+ and Cr5+ ions formation were discussed.

DEFECT STRUCTURE IN "SOFT" (Gd,Fe)-CODOPED PZT 52.5/47.5 PIEZOELECTRIC CERAMICS

2008 ◽  
Vol 01 (01) ◽  
pp. 7-11 ◽  
Author(s):  
EMRE ERDEM ◽  
MICHAEL D. DRAHUS ◽  
RÜDIGER-A. EICHEL ◽  
HANS KUNGL ◽  
MICHAEL J. HOFFMANN ◽  
...  
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Defect Structure ◽  
Charge Compensation ◽  
The Other ◽  
Partial Charge ◽  
Paramagnetic Resonance ◽  
Defect Dipole ◽  
Paramagnetic Probe ◽  
A Site ◽  
Electron Paramagnetic

Ferroelectric 1 mol% Gd 3+ and 0.5 mol% Fe 3+ codoped "soft" Pb [ Zr 0.525 Ti 0.475] O 3 ceramics were studied by means of multifrequency electron paramagnetic resonance (EPR) spectroscopy. The obtained results prove that iron is incorporated at the [ Zr , Ti ]-site, acting as an acceptor and building a charged [Formula: see text] defect dipole with a directly coordinated oxygen vacancy for partial charge compensation. As the La 3+ ion is diamagnetic, no information is accessible about the donor. Gd 3+ is an isoelectronic and paramagnetic probe for studying A-site. On the other hand, the donor forms no defect associates with lattice vacancies and rather exists as an "isolated" functional center. Consequently, also the lead vacancies that are created for charge compensation have to exist as isolated centers in compound.

FORMATION OF $({\rm Ti}'_{\rm Ti} - V_{\rm O}^{\bullet \bullet})^{\bullet}$ DEFECT DIPOLES IN BaTiO3 CERAMICS HEAT-TREATED UNDER REDUCED OXYGEN PARTIAL-PRESSURE

2010 ◽  
Vol 03 (01) ◽  
pp. 65-68 ◽  
Author(s):  
EMRE ERDEM ◽  
PETER JAKES ◽  
RÜDIGER-A. EICHEL ◽  
DEREK C. SINCLAIR ◽  
MAHABOOB PASHA ◽  
...  
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Barium Titanate ◽  
Oxygen Partial Pressure ◽  
Epr Spectroscopy ◽  
Defect Structure ◽  
Relative Size ◽  
Paramagnetic Resonance ◽  
Local Distortion ◽  
Heat Treated ◽  
Electron Paramagnetic

The defect structure of barium titanate ( BaTiO 3) heat-treated under reduced p O 2 has been investigated by electron paramagnetic resonance (EPR) spectroscopy. The results confirm the formation of [Formula: see text]-centers. Based on the relative size of the principal values of the electron g-matrix, g⊥ > g‖, the local distortion of the oxygen octahedron about the [Formula: see text]-centers was also analyzed and the formation of [Formula: see text] defect associates unambiguously established.

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