Investigations of the EPR zero-field splitting and the defect structure for Mn2+ and Fe3+ ions in anatase crystals

Qu, Gui-Qiang; Wu, Xiao‐Xuan; Zheng, Wen-Chen

doi:10.1016/j.saa.2006.12.076

Cited by 8 publications

(4 citation statements)

References 22 publications

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“…À (iii) only a very limited fraction of the manganese was localized inside the TiO 2 lattice in the form of Mn 2 þ . It is likely that Ti 4 þ had substituted for some Mn 2 þ , as already reported in the literature [58,59].…”

Section: Epr Characterizationmentioning

confidence: 52%

Synthesis of manganese oxide supported on mesoporous titanium oxide: Influence of the block copolymer

Schmit¹,

Bois²,

Chiriac³

et al. 2015

Journal of Solid State Chemistry

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SSCI-VIDE+CARE:CDFA+FSC:MBE:CDSInternational audienceManganese oxides supported on mesoporous titanium oxides were synthesized via a sol-gel route using block copolymer self-assembly. The oxides were characterized by X-ray diffraction, infrared spectroscopy, thermal analyses, nitrogen adsorption/desorption, electron microscopy and electronic paramagnetic resonance. A mesoporous anatase containing amorphous manganese oxide particles could be obtained with a 0.2 Mn:Ti molar ratio. At higher manganese loading (0.5 Mn:Ti molar ratio), segregation of crystalline manganese oxide occurred. The influence of block copolymer and manganese salt on the oxide structure was discussed. The evolution of the textural and structural characteristics of the materials upon hydrothermal treatment was also investigated. (C) 2014 Elsevier Inc. All rights reserved

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Section: Epr Characterizationmentioning

confidence: 52%

Synthesis of manganese oxide supported on mesoporous titanium oxide: Influence of the block copolymer

Schmit¹,

Bois²,

Chiriac³

et al. 2015

Journal of Solid State Chemistry

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“…in which the power-law exponents are t 2 ≈ 3 and t 4 ≈ 5 because of the ionic nature of the bonds (28,29). A 2 (R 0 ) and A 4 (R 0 ) are the intrinsic parameters with the reference distance R 0 .…”

Section: Calculationsmentioning

confidence: 99%

“…The parameter A 4 (R 0 ) is related to the cubic field parameter D q by the relation A 4 (R 0 ) = (3/4)D q (28)(29)(30), where D q can be obtained from the optical spectra of the studied system. For Ir 4+ and Rh 4+ in BaTiO 3 , no optical spectra data were reported.…”

Section: Calculationsmentioning

confidence: 99%

“…For example, by analyzing the optical and EPR spectra, we have A 2 (R 0 )/A 4 (R 0 ) ≈ 10 ± 2, 6 ± 2 and 5 ± 2 for 3d n (29,30,36,37), 4d n (35,38,39) and 5d n (35) clusters, respectively (note: the uncertainty of the ratio is due to the different nature of the md n clusters in various crystals). Thus, we take A 2 (R 0 )/A 4 (R 0 ) ≈ 5.5 for Rh 4+ (4d 5 ) ion in BaTiO 3 and A 2 (R 0 )/A 4 (R 0 ) ≈ 5 for Ir 4+ (5d 5 ) ion in BaTiO 3 .…”

Section: Calculationsmentioning

confidence: 99%

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Spin-Hamiltonian parameters and off-center displacements for Rh⁴⁺and Ir⁴⁺ions in rhombohedral BaTiO₃

Zheng

Zhang

2009

Radiation Effects and Defects in Solids

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By means of the formulae based on the first-order theory of resonance for a low-spin 2 T 2 term in trigonal symmetry, the spin-Hamiltonian parameters (g factors g // , g ⊥ and hyperfine structure constants A // , A ⊥ ) for Rh 4+ (4d 5 ) and Ir 4+ (5d 5 ) ions in the low-temperature rhombohedral phase of BaTiO 3 are calculated. The calculated results are in reasonable agreement with the experimental values. From the calculations, the off-center displacements of Rh 4+ and Ir 4+ in the oxygen octahedra of BaTiO 3 crystal are acquired. These impurity displacements are much smaller than that of the replaced host ion Ti 4+ . This point is analogous to the displacements of 3d n impurities Fe 3+ and Co 2+ in rhombohedral BaTiO 3 obtained by analyzing their spin-Hamiltonian parameters.

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Investigation of the EPR and local defect structures for (FeO6)9− and (MnO6)10− clusters in TiO2 crystal at different temperature

Lü

Kuang

et al. 2008

Chemical Physics Letters

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Investigations of the EPR zero-field splitting and the defect structure for Mn2+ and Fe3+ ions in anatase crystals

Cited by 8 publications

References 22 publications

Synthesis of manganese oxide supported on mesoporous titanium oxide: Influence of the block copolymer

Synthesis of manganese oxide supported on mesoporous titanium oxide: Influence of the block copolymer

Spin-Hamiltonian parameters and off-center displacements for Rh⁴⁺and Ir⁴⁺ions in rhombohedral BaTiO₃

Investigation of the EPR and local defect structures for (FeO6)9− and (MnO6)10− clusters in TiO2 crystal at different temperature

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Investigations of the EPR zero-field splitting and the defect structure for Mn2+ and Fe3+ ions in anatase crystals

Cited by 8 publications

References 22 publications

Synthesis of manganese oxide supported on mesoporous titanium oxide: Influence of the block copolymer

Synthesis of manganese oxide supported on mesoporous titanium oxide: Influence of the block copolymer

Spin-Hamiltonian parameters and off-center displacements for Rh4+and Ir4+ions in rhombohedral BaTiO3

Investigation of the EPR and local defect structures for (FeO6)9− and (MnO6)10− clusters in TiO2 crystal at different temperature

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Product

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Spin-Hamiltonian parameters and off-center displacements for Rh⁴⁺and Ir⁴⁺ions in rhombohedral BaTiO₃