Phase relations in oxygen-deficient SrCoO2.5−δ

Vashook, V.

doi:10.1016/s0167-2738(98)00270-7

Cited by 81 publications

(34 citation statements)

References 7 publications

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“…The estimated cell parameters are very different from those of the precursor SrCoO 2.5 or oxygen-vacant SrCoO 2.5−δ (0.21 < δ < 0.29) with a cubic structure. 18 The cell volume of the obtained film is 0.0570 nm 3 , which is somewhat smaller than that of the precursor film, 0.06004 nm 3 . The χ value of the 101 peak is close to that of the 011 peak, indicating that the film is composed of different domains with a-axes parallel to either STO [100] or STO [010], while the c-axes of all domains are aligned in the out-of-plane (STO [001]) direction.…”

Section: -4mentioning

confidence: 78%

Topotactic synthesis of strontium cobalt oxyhydride thin film with perovskite structure

et al. 2015

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The substitution of hydride anions (H−) into transition metal oxides has recently become possible through topotactic reactions or high-pressure synthesis methods. However, the fabrication of oxyhydrides is still difficult because of their inherently less-stable frameworks. In this study, we successfully fabricated perovskite SrCoOxHy thin films via the topotactic hydride doping of brownmillerite SrCoO2.5 epitaxial thin films with CaH2. The perovskite-type cation framework was maintained during the topotactic treatment owing to epitaxial stabilization. Structural and chemical analyses accompanied by X-ray absorption spectroscopy measurements revealed that the doped hydride ions form a two-dimensional network of Co-H−-Co bonds, in contrast to other reported perovskite oxyhydrides, SrMO3−xHx (M = Cr, Ti, V). The SrCoOxHy thin film exhibited insulating behavior and had a direct band gap of 2.1 eV. Thus, topotactic hydride doping of transition-metal-oxide thin films on suitable substrates is a promising method for the synthesis of new transition metal oxyhydrides.

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Section: -4mentioning

confidence: 78%

Topotactic synthesis of strontium cobalt oxyhydride thin film with perovskite structure

et al. 2015

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“…1b). The endothermic peak indicates the phase transition from the low-temperature 2H-BaNiO 3 -type hexagonal phase to the high-temperature cubic perovskite phase in SrCoO 3 − δ [30][31][32][33][34][35][36][37]. However, there are no any endothermic/exothermic peak observed for the Fe/Nb co-doped SrCo 1 − 2x (Fe,Nb) x O 3 − δ oxides, indicating both oxides possess highly structural stability.…”

Section: Resultsmentioning

confidence: 97%

Novel SrCo1−2x(Fe,Nb)xO3−δ (x = 0.05, 0.10) oxides targeting CO2 capture and O2 enrichment: Structural stability and oxygen sorption properties

et al. 2011

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“…They were unable to correctly identify the low temperature phases [15]. Vashook et al [16,17] explored phase transformation temperatures for strontium cobaltite (SrCoO x ) in a PO 2 range of 50 -400 Pa using XRD and TG. The stability regions for cubic perovskite, brownmillerite and low temperature phases (Sr 6 Co 5 O 15 ) at low PO 2 were determined.…”

Section: Sr-co-omentioning

confidence: 99%

“…Rodriguez et al [14] reported the transformation temperature from SrCoO 3−δ to Sr 2 Co 2 O 5 as 1113 K at PO 2 ≈ 10 −4 bar. Vashook et al [16] determined the stability range of SrCoO 3−δ at various temperatures using DTA and XRD. They [17,21] further investigated the oxygen nonstoichiometry and electrical conductivity of SrCoO 3−δ in a temperature range of 1223 − 1323 K and an oxygen partial pressure range of 10 bar by solid electrolyte coulometry and resistivity measurements.…”

Section: Srcoo 3-δmentioning

confidence: 99%

“…2 15000 [13,16], and, with lower weight in the optimization, enthalpies of formation from first-principles analysis [23]. While tremendous progress on accuracy of firstprinciple results has been achieved for metallic phases, the same quality does not apply to complex oxide phases due to many free parameters associated with competition between various interactions on the atomistic level.…”

Section: Liquidmentioning

confidence: 99%

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

et al. 2016

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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.

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Phase relations in oxygen-deficient SrCoO2.5−δ

Cited by 81 publications

References 7 publications

Topotactic synthesis of strontium cobalt oxyhydride thin film with perovskite structure

Topotactic synthesis of strontium cobalt oxyhydride thin film with perovskite structure

Novel SrCo1−2x(Fe,Nb)xO3−δ (x = 0.05, 0.10) oxides targeting CO2 capture and O2 enrichment: Structural stability and oxygen sorption properties

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

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