Structural and electromagnetic properties driven by oxygen vacancy in Sr2FeMoO6−δ double perovskite

Zhang, Q.; Xu, Z. F.; Wang, L.F.; Gao, Shuiying; Yuan, Suo Jia

doi:10.1016/j.jallcom.2015.07.211

Cited by 42 publications

(26 citation statements)

References 44 publications

(54 reference statements)

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“…Diamagnetic Mo 6+ (4 d 0 ) ions do not participate in the exchange interactions, and the latter ones between the Fe 2+ (3 d 6 ) or Fe 3+ (3 d 5 ) ions are necessarily negative, thus producing an antiferromagnetic ordering of the magnetic moments . Therefore, the distortion of the crystal lattice caused by defects in the cation and anion sublattices strongly influences the magnetic and electrical transport properties of strontium ferromolybdate …”

Section: Introductionmentioning

confidence: 99%

The Role of the Fe/Mo Cations Ordering Degree and Oxygen Non‐Stoichiometry on the Formation of the Crystalline and Magnetic Structure of Sr₂FeMoO_6−δ

Каланда

Турченко

Karpinsky

et al. 2018

Physica Status Solidi (b)

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Single‐phase Sr2FeMoO6−δ powders with various oxygen indices (δ) and degrees of the superstructural ordering (P) of the Fe/Mo cations are obtained from SrFeO2.52 and SrMoO4 reagents via solid‐state synthesis. It has been established by means of the X‐ray and neutron diffraction that, upon reducing the oxygen content and enhancing the superstructural ordering, the lengths of the Fe–O1 and Mo–O2 bonds in the crystal lattice increase, whereas the Fe–O2 and Mo–O1 bond lengths decrease. At the same time, the volume of the unit cell is reduced, which indicates an enhancement of the covalency degree of the bonds and stimulates a redistribution of the electron density, as well as an increase of the concentration of the spin‐down charge carriers located in the conduction band on the Mo(t2g)↓ orbitals. This circumstance leads to an increase of the density of states at the Fermi level, accompanied by an amplification of the exchange interaction and elevation of the Curie temperature, which points to the leading role of the spin‐polarized charge carriers at the Fermi level in the exchange interaction.

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Section: Introductionmentioning

confidence: 99%

The Role of the Fe/Mo Cations Ordering Degree and Oxygen Non‐Stoichiometry on the Formation of the Crystalline and Magnetic Structure of Sr₂FeMoO_6−δ

Каланда

Турченко

Karpinsky

et al. 2018

Physica Status Solidi (b)

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“…Pure double perovskite Sr 2 FeMoO 6− δ can only be obtained in a reducing atmosphere (e.g., 5 % H 2 /Ar) . Introducing divalent elements (e.g., Ni 2+ , Cu 2+ , Zn 2+ and Mg 2+ ) into the B′‐site of SFM is effective for tuning the double perovskite structure in an air atmosphere, mainly owing to the difference in the valence states compared with high valence Mo 6+ (see the Supporting Information, Figure S1) .…”

Section: Resultsmentioning

confidence: 77%

Smart Control of Composition for Double Perovskite Electrocatalysts toward Enhanced Oxygen Evolution Reaction

Sun

Gao

et al. 2019

ChemSusChem

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Double perovskites have emerged as efficient candidates for catalyzing the electrochemical oxygen evolution reaction (OER). Smart control of the composition of a B‐site ordered double perovskite can lead to improved catalytic performance. By adopting a facile co‐doping strategy, the OER‐active elements are simultaneously introduced into the B‐site and B′‐site of a B‐site‐ordered double perovskite (A2BB′O6), leading to an enhancement of the exposed reactive sites and an optimum surface chemical state. As a result, a model system built from the substitution of Co for Mo and Fe in the Sr2FeMoO6−δ double perovskite (with a composition of Sr2Fe0.8Co0.2Mo0.6Co0.4O6−δ) shows significantly enhanced OER activity in alkaline media compared with the host material, requiring an overpotential of 345 mV to reach a 10 mA cm−2 current density (catalyst loading≈0.232 mgcat cm−2GEO) and a cell voltage of 1.57 V to afford the same current density for the overall water splitting when coupled with a Pt/C cathode (catalyst loading≈2 mg cm−2). It also demonstrates excellent electrochemical stability. The generalizability of the compositional control methodology has also been demonstrated in double perovskites incorporating transition metals other than Co (e.g., Ni).

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“…The value of δ was determined only in a few number of reports . SFMO ceramics synthesized using SrCO 3 , Fe 2 O 3 , and MoO 3 powders as starting materials and applied to SFMO ceramics sintered at 1150 °C for 50 h in sealed ampoules together with Fe grains as oxygen trap possess an oxygen deficiency of δ ≈ 0.03 ± 0.02 as obtained by a redox method based on coulometric titration of both Fe 2+ and Mo 5+ in an inert Ar atmosphere .…”

Section: Phase Stability and Point Defects In Sr2femoo6−δmentioning

confidence: 99%

“…Iodimetry was performed by dissolving the sample in a dilute solution of HCl and I −1 ions, and the quantity of I 2 formed by oxidation was determined using titration of Na 2 S 2 O 3 . This revealed values of δ = 0.132 and 0.296 for polycrystalline ceramic samples sintered in a flow of 5% H 2 /Ar gas mixture at 1160 °C for 9 and 15 h, respectively . By means of weighing the samples before and after their complete reduction in a hydrogen flux at 1100 °C for 20 h, values of δ = 0.03…0.06 were obtained in polycrystalline SFMO samples prepared by the solid‐state synthesis technique from SrFeO 2.52 and SrMoO 4 precursors and annealed in a flux of 5% H 2 /Ar gas mixture at 1150 °C for 5 h with a subsequent quenching to room temperature …”

Section: Phase Stability and Point Defects In Sr2femoo6−δmentioning

confidence: 99%

Challenges in Sr₂FeMoO_6−δ Thin Film Deposition

Suchaneck

Каланда

Artsiukh

et al. 2019

Physica Status Solidi (b)

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This work reviews some fundamental issues that are relevant for the fabrication of stable‐phase strontium ferromolybdate thin films. The main challenges for strontium ferromolybdate thin film deposition arise from the sensitivity of the material's magnetic properties to point defect formation: i) Antisite defect formation and oxygen nonstoichiometry should be avoided by precise composition control during film manufacturing; ii) a highly ordered state of the correct phase and B‐site cation valence will be obtained only in a very narrow window of growth conditions; iii) to avoid additional antisite disorder with decreasing synthesis temperature, the effective temperature at the film surface should be increased by an energy flux to the growing film surface. Since thin film deposition is nonequilibrium in nature, the review starts with the consideration of equilibrium phase stability. Cation and oxygen stoichiometries are analyzed with regard to their effect on key magnetic properties. Film strain formed due to thermal and lattice mismatch is of great concern since it influences the choice of the substrate. Finally, thin film deposition techniques are valued for their benefits in strontium ferromolybdate thin film technology.

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Structural and electromagnetic properties driven by oxygen vacancy in Sr2FeMoO6−δ double perovskite

Cited by 42 publications

References 44 publications

The Role of the Fe/Mo Cations Ordering Degree and Oxygen Non‐Stoichiometry on the Formation of the Crystalline and Magnetic Structure of Sr₂FeMoO_6−δ

The Role of the Fe/Mo Cations Ordering Degree and Oxygen Non‐Stoichiometry on the Formation of the Crystalline and Magnetic Structure of Sr₂FeMoO_6−δ

Smart Control of Composition for Double Perovskite Electrocatalysts toward Enhanced Oxygen Evolution Reaction

Challenges in Sr₂FeMoO_6−δ Thin Film Deposition

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Structural and electromagnetic properties driven by oxygen vacancy in Sr2FeMoO6−δ double perovskite

Cited by 42 publications

References 44 publications

The Role of the Fe/Mo Cations Ordering Degree and Oxygen Non‐Stoichiometry on the Formation of the Crystalline and Magnetic Structure of Sr2FeMoO6−δ

The Role of the Fe/Mo Cations Ordering Degree and Oxygen Non‐Stoichiometry on the Formation of the Crystalline and Magnetic Structure of Sr2FeMoO6−δ

Smart Control of Composition for Double Perovskite Electrocatalysts toward Enhanced Oxygen Evolution Reaction

Challenges in Sr2FeMoO6−δ Thin Film Deposition

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The Role of the Fe/Mo Cations Ordering Degree and Oxygen Non‐Stoichiometry on the Formation of the Crystalline and Magnetic Structure of Sr₂FeMoO_6−δ

The Role of the Fe/Mo Cations Ordering Degree and Oxygen Non‐Stoichiometry on the Formation of the Crystalline and Magnetic Structure of Sr₂FeMoO_6−δ

Challenges in Sr₂FeMoO_6−δ Thin Film Deposition