Tuning optical and magnetic properties of nanocrystalline BaTiO3 films by Fe doping

Gao, Huiping; Tian, Jianjun; Tan, Furui; Zheng, He‐Gen; Zhang, Weifeng

doi:10.1007/s00339-018-2258-1

Cited by 8 publications

(2 citation statements)

References 36 publications

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“…The difference of binding energies between Fe 2p 3/2 and Fe 2p 1/2 is 13.41 eV, supporting the presence of Fe 3+ in the Li 5.7−× Co 0.7 Fe 0.3 O 4 . [ 50,51 ] The edge position of the C transition shifted to a higher energy because the oxidation state of Fe changed from Fe 3+ to Fe 4+ concurrently with the change in Co oxidation state. In Region II ( x = 2–5), the main edge position shifted to a lower energy, indicating that the average oxidation state of Fe decreased.…”

Section: Resultsmentioning

confidence: 99%

“…In addition to the XANES spectra, the oxidation state of Fe 3+ in its pristine state can be confirmed by X-ray photoelectron spectroscopy (XPS) analysis (Figure S8 Fe 2p 1/2 is 13.41 eV, supporting the presence of Fe 3+ in the Li 5.7−× Co 0.7 Fe 0.3 O 4 . [50,51] The edge position of the C transition shifted to a higher energy because the oxidation state of Fe changed from Fe 3+ to Fe 4+ S5, Supporting Information). Moreover, as shown in Figure 5b, the Raman intensity of the Co 3 O 4 -like phase becomes much larger than that of the LiCoO 2 -like phase at the end of the charge.…”

Section: Understanding Reaction Mechanism Of Hyper-lithiated Material...mentioning

confidence: 99%

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Modulating Anion Redox Reactions and Structural Evolution Through Fe‐Substitution in Li₆CoO₄ Hyper‐Lithiated Sacrificial Cathodes

Lee,

Byeon

et al. 2023

Advanced Energy Materials

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Utilizing hyper‐lithiated materials can offer a variety of options for designing high‐energy lithium‐ion batteries. As sacrificial cathodes, they compensate for the initial loss of Li+ at the anode. During the first delithiation process, a Fe‐substituted Li6CoO4 (Li5.7Co0.7Fe0.3O4) supplies a large amount of Li+. Especially, the peroxide species formation and oxygen evolution are suppressed even though the charge compensation of oxygen is facilitated in Li5.7Co0.7Fe0.3O4. From a structural viewpoint, the anti‐fluorite structure changes to defective disordered phases during the Li+ extraction, and the proportion of the electrochemical‐inactive phase is more dominant in the case of Li5.7Co0.7Fe0.3O4 at the end of the charge. Consequently, the delithiated LixCo0.7Fe0.3O4 is deactivated in subsequent cycles, reducing unexpected electrochemical reactions after the Li+ provision as sacrificial cathodes. These findings provide a comprehensive understanding of the reaction mechanism of hyper‐lithiated materials and represent a significant step forward in developing high‐performance sacrificial cathodes.

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Section: Resultsmentioning

confidence: 99%

Section: Understanding Reaction Mechanism Of Hyper-lithiated Material...mentioning

confidence: 99%

Modulating Anion Redox Reactions and Structural Evolution Through Fe‐Substitution in Li₆CoO₄ Hyper‐Lithiated Sacrificial Cathodes

Lee,

Byeon

et al. 2023

Advanced Energy Materials

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Multiferroic Properties and Magnetoelectric Coupling of Fe‐Doped (Ba_0.7Ca_0.3)TiO₃‐Ba(Zr_0.2Ti_0.8)O₃ Ceramics

Gong

Huang

Shao

et al. 2019

Physica Status Solidi (a)

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Fe-doped (Ba 0.7 Ca 0.3 )TiO 3 -Ba(Zr 0.2 Ti 0.8 )O 3 (BCZT) ceramics are prepared by a conventional solid-state reaction method, and their structure, multiferroic, and coupling properties are investigated. Ferromagnetism and magnetoelectric coupling are successfully realized by Fe 3þ doping. Meanwhile, Fe 3þ doping in BCZT results in a gradual transition from typical ferroelectrics to relaxor ferroelectrics or even quantum paraelectrics. In consequence, obvious magnetodielectric (MD) effect is observed only among the morphotropic phase boundary (MPB) temperature range. For (Ba 1.7 Ca 0.3 )(Zr 0.2 Ti 1.7 Fe 0.1 )O 6 ceramics, the coexistence of ferroelectricity and ferromagnetism along with a large MD effect is obtained below 200 K. Herein, the results highlight the role of MPB on the magnetoelectric coupling of ferroelectrics with a percolating of magnetic ions.

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Fe doping enhances ferromagnetism in MgTiO3 films

Zhao

Gao

Tian

et al. 2019

J Mater Sci: Mater Electron

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Tuning optical and magnetic properties of nanocrystalline BaTiO3 films by Fe doping

Cited by 8 publications

References 36 publications

Modulating Anion Redox Reactions and Structural Evolution Through Fe‐Substitution in Li₆CoO₄ Hyper‐Lithiated Sacrificial Cathodes

Modulating Anion Redox Reactions and Structural Evolution Through Fe‐Substitution in Li₆CoO₄ Hyper‐Lithiated Sacrificial Cathodes

Multiferroic Properties and Magnetoelectric Coupling of Fe‐Doped (Ba_0.7Ca_0.3)TiO₃‐Ba(Zr_0.2Ti_0.8)O₃ Ceramics

Fe doping enhances ferromagnetism in MgTiO3 films

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Tuning optical and magnetic properties of nanocrystalline BaTiO3 films by Fe doping

Cited by 8 publications

References 36 publications

Modulating Anion Redox Reactions and Structural Evolution Through Fe‐Substitution in Li6CoO4 Hyper‐Lithiated Sacrificial Cathodes

Modulating Anion Redox Reactions and Structural Evolution Through Fe‐Substitution in Li6CoO4 Hyper‐Lithiated Sacrificial Cathodes

Multiferroic Properties and Magnetoelectric Coupling of Fe‐Doped (Ba0.7Ca0.3)TiO3‐Ba(Zr0.2Ti0.8)O3 Ceramics

Fe doping enhances ferromagnetism in MgTiO3 films

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Modulating Anion Redox Reactions and Structural Evolution Through Fe‐Substitution in Li₆CoO₄ Hyper‐Lithiated Sacrificial Cathodes

Modulating Anion Redox Reactions and Structural Evolution Through Fe‐Substitution in Li₆CoO₄ Hyper‐Lithiated Sacrificial Cathodes

Multiferroic Properties and Magnetoelectric Coupling of Fe‐Doped (Ba_0.7Ca_0.3)TiO₃‐Ba(Zr_0.2Ti_0.8)O₃ Ceramics