Electrical conductivity and oxygen nonstoichiometry of SrCo0.25Fe0.75O3-δ

Vashuk, V. V.; Kokhanovskii, L. V.; Yushkevich, I. I.

doi:10.1007/bf02757982

Cited by 6 publications

(6 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The sequence of phase transformations in SrCo 1 − x Fe x O 3 -δ in the range 0.2 ≤ x ≤ 0.9 [5,6] is consistent with the phase boundaries of SrFeO 3 -δ [7,8]. As evidenced by powder x-ray diffraction (XRD) data [9], the structural processes during SrCo 1 − x Fe x O 3 -δ synthesis have a number of features in common with those in unsubstituted strontium ferrate.…”

Section: Introductionmentioning

confidence: 56%

“…At the same time, according to Vashuk et al [6] thermal cycling of ceramic SrCo 0.25 Fe 0.75 O 3 -δ sam-2 ples in air between 400 and 600°C leads to sharp changes in resistivity, attributable to anisotropic thermal expansion of individual grains in the polycrystalline samples, which may give rise to microcracking. Higher temperature annealing eliminated microcracks, so that no resistivity jumps occurred during repeated thermal cycling between 800 and 1000°C.…”

Section: Resultsmentioning

confidence: 98%

“…The sample surface exposed to argon ( = 1-40 Pa) must undergo a sequence of phase transitions with the formation of a brownmillerite phase in the range 400-800°C, where the samples are two-phase, and, as the temperature is raised, the cubic phase gradually transforms into the brownmillerite phase [6]. This conclusion is supported by high-temperature XRD data for SrCo 1x Fe x O 3 -δ powders with x = 0.3 and 0.5 [5] (for the other compositions, no high-temperature XRD data were obtained).…”

Section: Resultsmentioning

confidence: 99%

“…As evidenced by powder x-ray diffraction (XRD) data [9], the structural processes during SrCo 1 − x Fe x O 3 -δ synthesis have a number of features in common with those in unsubstituted strontium ferrate. Partial substitution of Co for Fe ions in the B site of SrFeO 3 -δ has no drastic effect on the mechanism of defect disordering in the stability region of the perovskite phase [6].…”

Section: Introductionmentioning

confidence: 97%

“…In particular, the limits of this solid-solution series reported in [5,6] differ from those determined by Liu et al [10]. According to Mizusaki et al [7], the phase boundary of SrFeO 3 -δ at temperatures from 300 to 900 ° C and < 300 Pa depends significantly on oxygen partial pressure, whereas in later studies [5] a very weak or no dependence was found for SrCo 0.1 Fe 0.9 O 3 − δ , even though the two materials are very similar in a number of properties.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Structural Stability of SrCo1 − x FexO3 − δ Solid Solutions

et al. 2005

Self Cite

View full text Add to dashboard Cite

SrCo 1x Fe x O 3 -δ solid solutions with 0.3 ≤ x ≤ 0.9 are shown to have the cubic perovskite structure. The unit-cell parameter and volume of the solid solutions are nonmonotonic functions of Fe content, with a minimum at x = 0.4. Dilatometric data are used to determine the thermal expansion coefficients of the solid solutions. At low oxygen partial pressures ( ≤ 40 Pa), the high-temperature, disordered perovskite phase exists between 850 and 1000 ° C, which is the optimal temperature range for the effective use of SrCo 1x F e x O 3 -δ ceramics as oxygen membranes in oxygen partial pressure gradients of 10 4

show abstract

Section: Introductionmentioning

confidence: 56%

Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Structural Stability of SrCo1 − x FexO3 − δ Solid Solutions

et al. 2005

Self Cite

View full text Add to dashboard Cite

show abstract

Impact of High Pressure and High Temperature on Annealed Oxygen-deficient CoSrO3−δ Perovskites: Structural and Magnetization Studies

Balamurugan

2009

J Supercond Nov Magn

View full text Add to dashboard Cite

Thermodynamic modeling of the Sr–Co–Fe–O system

et al. 2016

View full text Add to dashboard Cite

This paper reviews and assesses phase equilibria and thermodynamic properties of phases in the Sr-Co-Fe-O system, with a focus on oxides, especially the SrCo 1−x Fe x O 3−δ perovskite. In our work, the SrCo 1−x Fe x O 3−δ perovskite was modeled with a three-sublattice model, where the three sublattices correspond to the A, B and oxygen sites in an ABO 3 perovskite, respectively. A number of other important ternary oxide phases in Sr-Co-O and Sr-Co-Fe-O were also considered. Available thermodynamic and phase diagram data were carefully assessed. A thermodynamic description of Sr-Co-O was derived using the CALPHAD approach and was further extrapolated to that of Sr-Co-Fe-O. The thermodynamic database of Sr-Co-Fe-O established in this work allows for calculating phase diagrams, thermodynamic properties, cation distribution and defect chemistry properties, and therefore enables material composition optimization for various applications, including solid oxide fuel cells and oxygen membranes.

show abstract

Electrical conductivity and oxygen nonstoichiometry of SrCo0.25Fe0.75O3-δ

Cited by 6 publications

References 17 publications

Structural Stability of SrCo1 − x FexO3 − δ Solid Solutions

Structural Stability of SrCo1 − x FexO3 − δ Solid Solutions

Impact of High Pressure and High Temperature on Annealed Oxygen-deficient CoSrO3−δ Perovskites: Structural and Magnetization Studies

Thermodynamic modeling of the Sr–Co–Fe–O system

Contact Info

Product

Resources

About