Synthesis, structural and electrical characterizations of Sr2Fe1−xMxNbO6 (M=Zn and Cu) with double perovskite structure

Xia, Tian; Liu, X.D.; Li, Q.; Meng, Junling; Cao, Xia

doi:10.1016/j.jallcom.2005.11.084

Cited by 14 publications

(4 citation statements)

References 41 publications

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“…Measurements up to 600 °C reveal an average linear thermal expansion coefficient of 11.4(3)⋅10 −6 K −1 which is close to the value found for SrFe 0.5 Nb 0.5 O 3 [46].…”

Section: Sintering Behaviour and Microstructure Of Ceramic Bodiessupporting

confidence: 80%

Investigations of BaFe0.5Nb0.5O3 nano powders prepared by a low temperature aqueous synthesis and resulting ceramics

Köferstein

Ebbinghaus

2017

Journal of the European Ceramic Society

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A facile method to prepare nanoscaled BaFe 0.5 Nb 0.5 O 3 via synthesis in boiling NaOH solution is described herein. The nano-crystalline powder has a high specific surface area of 55 m 2 g −1 and a crystallite size of 15 nm. The as-prepared powder does not show any significant crystallite growth up to 700 °C. The activation energy of the crystallite growth process was calculated as 590 kJ mol −1. Dense ceramics can be obtained either after sintering at 1200 °C for 1 h or after two-step sintering at 1000 °C for 10 h. The average grain sizes of ceramic bodies can be tuned between 0.23 µm and 12 µm. The thermal expansion coefficient was determined as 11.4(3)⋅10 −6 K −1. The optical band gap varies between 2.90(5) and 2.63(3) eV. Magnetic measurements gave a Néel temperature of 20 K. Depending on the sintering regime, the ceramic samples reach permittivity values between 2800 and 137000 at RT and 1 kHz.

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“…Measurements up to 600 °C reveal an average linear thermal expansion coefficient of 11.4(3)⋅10 −6 K −1 which is close to the value found for SrFe 0.5 Nb 0.5 O 3 [46].…”

Section: Sintering Behaviour and Microstructure Of Ceramic Bodiessupporting

confidence: 80%

Investigations of BaFe0.5Nb0.5O3 nano powders prepared by a low temperature aqueous synthesis and resulting ceramics

Köferstein

Ebbinghaus

2017

Journal of the European Ceramic Society

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“…LDA+U calculations, as it is implemented in the Cambridge Serial Total Energy Package (CASTEP) code [33], were carried out on a tetragonal structure with space group I4/m (No. 87), which has been reported from experimental and theoretical works [8,9,14,15,34]. The I4/m tetragonal structure has Z=2, with Wyckoff atoms positions as follows (figure 1): Sr, 4d (1/2, 0, 1/4); Fe, 2a (0, 0, 0); Nb, 2b (0, 0, 1/2); O1, 8 h (x, y, 0); O2, 4e (0, 0, z).…”

Section: Computational Detailsmentioning

confidence: 64%

“…Because of these characteristics, it is considered as a compound with high potential to be used: (i) for hydrogen generation, as photocatalyst [2][3][4][5]; (ii) for solar cells, which performance is improved by making Ti substitutions at Fe sites [6]; (iii) in solid oxide fuel cells (SOFC), as cathode [7][8][9][10]. Besides, it has been shown that the compound is stable in a reducing atmosphere; therefore, it could be considered as anode for SOFC [4] and consequently could be proposed for symmetric SOFC.…”

Section: Introductionmentioning

confidence: 99%

LDA+U study of hydrostatic pressure effect on double perovskite Sr₂FeNbO₆: crystal structure, mechanical and electronic properties

et al. 2020

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To study the effect of the applied hydrostatic pressure on the crystal structure and the electronic and mechanical properties of the Sr2FeNbO6 compound, computational calculations in the density functional theory framework, with the local density approximation and Hubbard correction as it is treated by the CA-PZ exchange-correlation functional were performed. The tetragonal structure with the I4/m space group is reported stable in the range from zero to 50 GPa according to Born’s stability criterion. No crystal phase transition was found in agreement with experimental data; however, between 20 and 30 GPa, a brittle to ductile transition is confirmed by the Pugh’s criterion and Poisson’s ratio. Moreover, a change from ionic-covalent to metallic bonding is suggested by the Poisson’s ratio. This behavior is reflected in the electronic properties, through the controlled modulation of the energy bandgap (Eg (eV)) as a function of pressure, according to a fitted linear equation, Eg = (−0.016)P + 2.040. At 50 GPa, Eg value is 1.236 eV, very close to the ideal 1.34 eV, which is required for hydrogen generation and photovoltaic applications.

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“…Double-perovskite oxides are special members of the perovskite materials [1]. Currently, perovskite materials have been widely applied in the oxygen electrode of Solid Oxide Electrolysis Cell (SOEC), such as La 1-x Sr x MnO 3 .…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Sr2Fe1-xMnxNbO6-δ Powders and their Stability as Electrode of Solid Oxide Electrolysis Cell

Deng

et al. 2012

KEM

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Double-perovskite Sr2Fe1-xMnxNbO6-δ (x = 0, 0.1, 0.2, 0.3, 0.5, 0.8) (SFMN) powders which will be applied to the electrode of solid oxide electrolysis cells (SOEC) were synthesized by Solid State Reaction Method. The mixed oxide powders SrCO3, Fe2O3, MnO2 and Nb2O5, were homogeneously calcined at different temperatures and in different atmospheres. The influence of the preparation process on the structure and the morphology of the powder were investigated by X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). It is found that the formation of perovskite structure is directly related to the content of Mn and calcining temperature. Controllable synthesis of pure phase of double perovskite powders was realized after calcining for12h at 1150 °C in air. Moreover, the experimental results show that the perovskite structure of SFMN is stable in whether oxidizing or reducing atmosphere, which indicates that this material has a potential to be used as electrode of solid oxide electrolysis cell.

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Synthesis, structural and electrical characterizations of Sr2Fe1−xMxNbO6 (M=Zn and Cu) with double perovskite structure

Cited by 14 publications

References 41 publications

Investigations of BaFe0.5Nb0.5O3 nano powders prepared by a low temperature aqueous synthesis and resulting ceramics

Investigations of BaFe0.5Nb0.5O3 nano powders prepared by a low temperature aqueous synthesis and resulting ceramics

LDA+U study of hydrostatic pressure effect on double perovskite Sr₂FeNbO₆: crystal structure, mechanical and electronic properties

Synthesis of Sr<sub>2</sub>Fe<sub>1-x</sub>Mn<sub>x</sub>NbO<sub>6-δ</sub> Powders and their Stability as Electrode of Solid Oxide Electrolysis Cell

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Synthesis, structural and electrical characterizations of Sr2Fe1−xMxNbO6 (M=Zn and Cu) with double perovskite structure

Cited by 14 publications

References 41 publications

Investigations of BaFe0.5Nb0.5O3 nano powders prepared by a low temperature aqueous synthesis and resulting ceramics

Investigations of BaFe0.5Nb0.5O3 nano powders prepared by a low temperature aqueous synthesis and resulting ceramics

LDA+U study of hydrostatic pressure effect on double perovskite Sr2FeNbO6: crystal structure, mechanical and electronic properties

Synthesis of Sr<sub>2</sub>Fe<sub>1-x</sub>Mn<sub>x</sub>NbO<sub>6-δ</sub> Powders and their Stability as Electrode of Solid Oxide Electrolysis Cell

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LDA+U study of hydrostatic pressure effect on double perovskite Sr₂FeNbO₆: crystal structure, mechanical and electronic properties