Introducing Barium in Transition Metal Oxide Frameworks: Impact upon Superconductivity, Magnetism, Multiferroism and Oxygen Diffusion and Storage

Raveau, B.

doi:10.1002/tcr.201600119

Cited by 8 publications

(9 citation statements)

References 188 publications

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“…In other words, the CO 2 resistance is another important factor to consider when developing OSMs. Various perovskite-related materials (BaYMn 2 O 5+δ or LnBaCo 2 O 5+δ with Ln = lanthanide elements) and oxysulfides (Pr 2 O 2 SO 4 ) have been reported to perform well as OSMs. − Still, little consideration has been paid toward their CO 2 resistance, even though alkaline earth or lanthanide elements contained in these OSMs are well-known to easily form carbonate species in a CO 2 atmosphere because of their high basicity. , To the best of our knowledge, the CO 2 resistance of OSMs that are meant to be alternatives to the CeO 2 -ZrO 2 solid-solution in automobiles has not been clarified.…”

Section: Introductionmentioning

confidence: 99%

Oxygen Storage Property and Chemical Stability of SrFe_1–xTi_xO_3−δ with Robust Perovskite Structure

et al. 2017

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The compounds of SrFe1–x Ti x O3−δ with a robust perovskite structure are synthesized by Ti substitution for Fe sites in SrFeO3−δ, and they display improved oxygen storage properties and chemical stability in a CO2 atmosphere. The oxygen storage rate of SrFe0.8Ti0.2O3−δ is over 5 times faster than that of SrFeO3−δ. Further, in the presence of CO2, SrFe1–x Ti x O3−δ with x ≥ 0.2 maintains its oxygen storage property, whereas, for x ≤ 0.1, the oxygen release rate drastically deteriorates due to the formation of SrCO3. The perovskite structures (space group I4/mmm) of SrFe1–x TixO3−δ (x ≥ 0.2) are preserved even after reduction treatment under a H2 atmosphere at 773 K. In contrast, the material with x ≤ 0.1 undergoes a phase transformation from perovskite (I4/mmm) to brownmillerite structures (Ima2), and the latter easily reacts with CO2 to form a large amount of SrCO3 on the surface. Thus, the robust perovskite structure maintains its original framework despite the reduction treatment, resulting in improved oxygen storage rate as well as the CO2 resistance.

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Section: Introductionmentioning

confidence: 99%

Oxygen Storage Property and Chemical Stability of SrFe_1–xTi_xO_3−δ with Robust Perovskite Structure

et al. 2017

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“…quenching at 1200°C for the commensurate phase [41] but was not indicated for the incommensurate oxide [42]. Bearing in mind that in cobalt-based oxides the presence of alkaline earth cations favors the partial oxidation of Co 2+ into Co 3+ [48], as recently invoked for the spin chain oxide Sr3CaMn2CoO9+δ [45], this suggests that oxygen over stoichiometry should be the mechanism at play behind this different structural behavior. To unravel this intriguing problem of the actual localization of extra oxygen in these compounds, we have investigated a series of samples with the composition Sr1+x(Mn1-xCox)O3+δ, with x ranging from 0.2857 to 0.40 , all prepared in the same conditions at 1400°C in air and quenched at this temperature for the sake of comparison.…”

Section: Synthesis and Characterization Of A Large Family Of Aperiodic Structures Sr 1+x (Mn 1-x Co X )O 3+δ : How To Interpret The Oxygementioning

confidence: 85%

Oxygen over stoichiometry in the 2H-perovskite related structure: the route to a large family of cation deficient Ising chain oxides Sr_1+y[(Mn_1−xCo_x)_1−z□_z]O₃

et al. 2020

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“…Such an oxide containing exclusively strontium was never synthesized in air due to the partial oxidation of Co 2+ into Co 3+ , imposing δ > 0. In fact, previous studies have shown that this over oxidation originates from the presence, in transition metal oxide frameworks, of alkaline earth cations which may enhance significantly the oxidation of the transition element toward a higher state during the synthesis in air. , This is exemplified by the high Tc cuprates involving the mixed valence Cu 2+ /Cu 3+ and numerous cobaltates characterized by the mixed valence Co 2+ /Co 3+ . Importantly, we have noticed that the “oxidation power” of the alkaline earth metal decreases from Ba to Sr to Ca.…”

Section: Introductionmentioning

confidence: 99%

Composite Spin Chain Structures Built up of Dimeric and Trimeric Polyhedral Units: The Oxides A_1+y[(Mn_1–xCo_x)_1–z□_z]O₃ (A = Ca, Sr; x = 3/8)

et al. 2022

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The investigation of the substitution of calcium for strontium in the composite spin chain structure of the oxide Sr 11/8 (Mn 5/8 Co 3/8 )O 3+δ has been performed combining powder/single crystal X-ray diffraction and 3D electron diffraction. A large family of composite commensurate/ incommensurate spin chain structures A 1+y [(Mn 5/8 Co 3/8 ) 1−z □ z ]O 3 , built up of face sharing MnO 6 /CoO 6 octahedra and a CoO 6 trigonal prism and containing cationic vacancies (□) on the prismatic sites, has been synthesized, varying the alkaline earth ion content on the A site according to the nominal composition Sr 11−n Ca n Mn 5 Co 3 O 24 . It is shown that the structural nature of the chains and content of cationic vacancies can be directly designed from the Ca/Sr ratio, based on the larger oxidation power of strontium compared to calcium during synthesis in air. In this way, the cationic vacancy content z can be significantly decreased from 1/33 to 0.002 by increasing the Ca content from n = 0 to n = 6.8. Correlatively, the proportion of dimeric units (1 octahedron/1 trigonal prism) with respect to trimeric units (2 octahedra/1 trigonal prism) increases continuously from 0 to 1/3 as the Ca content increases from n = 0 to n = 6.8. It is also shown that the influence of the proportion of these dimeric/trimeric units on the magnetism of these oxides is remarkable, suggesting that, besides the size effect of calcium, it plays a role in the appearance of long-range ordering in this system.

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Introducing Barium in Transition Metal Oxide Frameworks: Impact upon Superconductivity, Magnetism, Multiferroism and Oxygen Diffusion and Storage

Cited by 8 publications

References 188 publications

Oxygen Storage Property and Chemical Stability of SrFe_1–xTi_xO_3−δ with Robust Perovskite Structure

Oxygen Storage Property and Chemical Stability of SrFe_1–xTi_xO_3−δ with Robust Perovskite Structure

Oxygen over stoichiometry in the 2H-perovskite related structure: the route to a large family of cation deficient Ising chain oxides Sr_1+y[(Mn_1−xCo_x)_1−z□_z]O₃

Composite Spin Chain Structures Built up of Dimeric and Trimeric Polyhedral Units: The Oxides A_1+y[(Mn_1–xCo_x)_1–z□_z]O₃ (A = Ca, Sr; x = 3/8)

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Introducing Barium in Transition Metal Oxide Frameworks: Impact upon Superconductivity, Magnetism, Multiferroism and Oxygen Diffusion and Storage

Cited by 8 publications

References 188 publications

Oxygen Storage Property and Chemical Stability of SrFe1–xTixO3−δ with Robust Perovskite Structure

Oxygen Storage Property and Chemical Stability of SrFe1–xTixO3−δ with Robust Perovskite Structure

Oxygen over stoichiometry in the 2H-perovskite related structure: the route to a large family of cation deficient Ising chain oxides Sr1+y[(Mn1−xCox)1−z□z]O3

Composite Spin Chain Structures Built up of Dimeric and Trimeric Polyhedral Units: The Oxides A1+y[(Mn1–xCox)1–z□z]O3 (A = Ca, Sr; x = 3/8)

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Oxygen Storage Property and Chemical Stability of SrFe_1–xTi_xO_3−δ with Robust Perovskite Structure

Oxygen Storage Property and Chemical Stability of SrFe_1–xTi_xO_3−δ with Robust Perovskite Structure

Oxygen over stoichiometry in the 2H-perovskite related structure: the route to a large family of cation deficient Ising chain oxides Sr_1+y[(Mn_1−xCo_x)_1−z□_z]O₃

Composite Spin Chain Structures Built up of Dimeric and Trimeric Polyhedral Units: The Oxides A_1+y[(Mn_1–xCo_x)_1–z□_z]O₃ (A = Ca, Sr; x = 3/8)