Crystal structure and Cu/Fe K-edge analysis of Ba0.5Sr0.5Fe1-xCuxO3-δ (x = 0–0.2) and the influence on conductivity

Fitriana, F.; Baity, P.S.N.; Zainuri, Mochamad; Kidkhunthod, Pinit; Suasmoro, S.

doi:10.1016/j.jpcs.2021.110065

Cited by 7 publications

(3 citation statements)

References 35 publications

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“…From Figure b, it can be observed that an Fe 2p 3/2 spin–orbit peak is located at 710.4 eV that can be deconvoluted into two peaks, 710.09 and 712.01 eV, indicating the existence of a mixture of Fe 3+ and Fe 4+ . The peak of 2p 1/2 is located at 723.9 eV, with a satellite peak at 718.9 eV, which suggests that the valence state of Fe can be ascribed to Fe 3+ . − The existence of Fe 4+ ions in the samples originates from the bond between the Fe and O and can bring oxygen vacancies into the system, which can change the elemental distribution. Figure c shows the O 1s XPS spectrum, and it can be deconvoluted into two peaks, which can be assigned to lattice O (Mn–O–Mn) at 529.6 eV and surface-adsorbed O (Mn–O–H) at 531.4 eV.…”

Section: Resultsmentioning

confidence: 99%

Fe-Doped MnO₂ Nanostructures for Attenuation–Impedance Balance-Boosted Microwave Absorption

Song

Duan

Cui

et al. 2022

ACS Appl. Nano Mater.

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The attenuation–impedance property plays the key role in the microwave absorption process. In this work, the phenomenon of Fe inducing the gradient phase and morphology transition of MnO2 has been well explored. As the Fe doping content increases, the phase evolution from δ-MnO2 to α-MnO2 and the morphology transition from nanosheets to nanowires occur. Based on this, the multiphase MnO2 nanostructures composed by δ-MnO2 nanosheets and α-MnO2 nanowires are controllably synthesized, in which the former has a high impedance matching characteristic and the latter owns an excellent attenuation ability. By adjusting the Fe3+ doping content, the multiphase MnO2 can realize the balance between attenuation and impedance. When the doping ratio (Fe/Mn) is 7.14 mol %, in the frequency range of 2–18 GHz, the attenuation coefficient of the MnO2 composite is 14.77–194.35, the intrinsic impedance coefficient is 0.29–0.40, and the effective absorption bandwidth (reflection loss < −10 dB) can reach 5.44 GHz when the thickness of the absorbing layer is only 2 mm. This work provides an effective method for designing broadband microwave absorption materials.

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Section: Resultsmentioning

confidence: 99%

Fe-Doped MnO₂ Nanostructures for Attenuation–Impedance Balance-Boosted Microwave Absorption

Song

Duan

Cui

et al. 2022

ACS Appl. Nano Mater.

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“…and Rwp < 15 [12]. In this study, the zero offset starts from an angle of 2θ: -0.049°, the values of V: -0.01200 and W : 0.02100 are obtained from the characteristics of the instruments.…”

Section: Table 1 Parameters Of Diffraction Analysismentioning

confidence: 99%

Crystallography Analysis on LSCF and LSM-based Perovskite Oxides

Silvana Dwi Nurherdiana,

Nikmatin Sholichah,

Susilowati

et al. 2023

Technium

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Perovskite oxide as a metal oxide offers an excellence on mixed ionic and electronic conductor (MIEC) properties which work simultaneously. The crystal structure of perovskite oxide plays the important role to achieve the superior performance. Generally, it formed a cubic which potentially distorted due to the ratio of metal ion constituents, the calcination temperature and the synthesis method used. Thus, this study presents chemical analysis of La0.7Sr0.3Co0.2Fe0.8O3-δ (LSCF) and La0.7Sr0.3MnO3-δ (LSM)-based perovskite oxides through crystallographic identification using Rietveld Refinement method (Rietica software) and material porosity analysis. The results show that the two types of perovskite oxide have different distorted crystal structures. Perovskite oxide LSCF produces hexagonal crystals and 63.98% rhombohedral dominance, while LSM remained significantly different from LSCF. LSM consist less hexagonal and 55.47% cubic structure. In addition, the pore characteristics indicate that macropores and pore volumes are more abundant in LSCF than LSM. This information can be used as a basis for the use of oxide materials as a separator of oxygen ions from the air, solid oxide fuel cells and catalyst for value-added chemical production from methane flue gas.

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“…Jakub et al studied La 1−x Sr x Ni 1−y Cu y O 3−δ and achieved the maximum power value of 450 mW cm −2 at 650 • C [18]. Considering that Cu is present in multiple oxidation states (Cu + , Cu 2+ , Cu 3+ ), similar to Co, Fe, and Mn, it is reasonable to use perovskite materials containing Cu as the SOFC cathode [19].…”

Section: Introductionmentioning

confidence: 99%

Oxygen Vacancy and Valence Band Structure of Ba0.5Sr0.5Fe1−xCuxO3−δ (x = 0–0.15) with Enhanced ORR Activity for IT-SOFCs

Lim

Lee

2023

Materials

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The oxygen reduction reaction (ORR) activity of a Cu-doped Ba0.5Sr0.5FeO3−δ (Ba0.5Sr0.5Fe1−xCuxO3−δ, BSFCux, x = 0, 0.05, 0.10, 0.15) perovskite cathode was investigated in terms of oxygen vacancy formation and valence band structure. The BSFCux (x = 0, 0.05, 0.10, 0.15) crystallized in a cubic perovskite structure (Pm3¯m). By thermogravimetric analysis and surface chemical analysis, it was confirmed that the concentration of oxygen vacancies in the lattice increased with Cu doping. The average oxidation state of B-site ions decreased from 3.583 (x = 0) to 3.210 (x = 0.15), and the valence band maximum shifted from −0.133 eV (x = 0) to −0.222 eV (x = 0.15). The electrical conductivity of BSFCux increased with temperature because of the thermally activated small polaron hopping mechanism showing a maximum value of 64.12 S cm−1 (x = 0.15) at 500 °C. The ASR value as an indicator of ORR activity decreased by 72.6% from 0.135 Ω cm2 (x = 0) to 0.037 Ω cm2 (x = 0.15) at 700 °C. The Cu doping increased oxygen vacancy concentration and electron concentration in the valence band to promote electron exchange with adsorbed oxygen, thereby improving ORR activity.

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Crystal structure and Cu/Fe K-edge analysis of Ba0.5Sr0.5Fe1-xCuxO3-δ (x = 0–0.2) and the influence on conductivity

Cited by 7 publications

References 35 publications

Fe-Doped MnO₂ Nanostructures for Attenuation–Impedance Balance-Boosted Microwave Absorption

Fe-Doped MnO₂ Nanostructures for Attenuation–Impedance Balance-Boosted Microwave Absorption

Crystallography Analysis on LSCF and LSM-based Perovskite Oxides

Oxygen Vacancy and Valence Band Structure of Ba0.5Sr0.5Fe1−xCuxO3−δ (x = 0–0.15) with Enhanced ORR Activity for IT-SOFCs

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Crystal structure and Cu/Fe K-edge analysis of Ba0.5Sr0.5Fe1-xCuxO3-δ (x = 0–0.2) and the influence on conductivity

Cited by 7 publications

References 35 publications

Fe-Doped MnO2 Nanostructures for Attenuation–Impedance Balance-Boosted Microwave Absorption

Fe-Doped MnO2 Nanostructures for Attenuation–Impedance Balance-Boosted Microwave Absorption

Crystallography Analysis on LSCF and LSM-based Perovskite Oxides

Oxygen Vacancy and Valence Band Structure of Ba0.5Sr0.5Fe1−xCuxO3−δ (x = 0–0.15) with Enhanced ORR Activity for IT-SOFCs

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Fe-Doped MnO₂ Nanostructures for Attenuation–Impedance Balance-Boosted Microwave Absorption

Fe-Doped MnO₂ Nanostructures for Attenuation–Impedance Balance-Boosted Microwave Absorption