Structure and oxygen stoichiometry in Sr3Fe2O7−y, 0 ≤ y ≤ 1.0

Dann, Sandra E.; Weller, Mark T.; Currie, D.B.

doi:10.1016/0022-4596(92)90023-o

Cited by 143 publications

(148 citation statements)

References 8 publications

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“…As n=1 members of the Ruddlesden-Popper phases, the K 2 NiF 4 -type oxides have shown an enhanced stability under reducing conditions due to their ability to accommodate a wide range of coordination environments and oxidation states. Ruddlesden-Popper phases such as Sr 3 Fe 2 O 7-į [3] and Sr 3-x La x Fe 2-y Co y O 7-į [4] have shown a high degree of structural stability in reducing environments at elevated temperature and reasonably good transport properties making them possible candidates for oxygen separation membranes and solid oxide fuel cells. We have previously shown that LaSrCo 0.5 Fe 0.5 O 4 is able to withstand reducing condition (10% H 2 /N 2 ) up to 1000°C via reduction of Co 3+ into Co 2+ and formation of LaSrCo 0.5 Fe 0.5 O 3.75 [5].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of La0.8Sr1.2Co0.5M0.5O4−δ (M=Fe, Mn)

El‐Shinawi

Marco

Berry

et al. 2009

Journal of Solid State Chemistry

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Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of La0.8Sr1.2Co0.5M0.5O4−δ (M=Fe, Mn)

El‐Shinawi

Marco

Berry

et al. 2009

Journal of Solid State Chemistry

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“…No evidence for oxygen order has been reported in Sr 3 Fe 2 O 7−δ . Limited data on Sr 3 Fe 2 O 7−δ powder samples suggest that the antiferromagnetic transition temperature T N in this material decreases as oxygen is removed, possibly approaching zero near δ = 0.5 21,22 before recovering for δ = 1, where a magnetic transition with T N as high as 550 K has been claimed. , whose origin has yet to be determined, and could suggest the presence of a metamagnetic quantum critical point.…”

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confidence: 99%

Magnetic phase diagram of Sr3Fe2O7−δ

et al. 2013

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Magnetometry, electrical transport, and neutron scattering measurements were performed on single crystals of the Fe 4+ -containing perovskite-related phase Sr3Fe2O 7−δ as a function of oxygen content. Although both the crystal structure and electron configuration of this compound are closely similar to those of well-studied ruthenates and manganates, it exhibits very different physical properties. The fully-oxygenated compound (δ = 0) exhibits a charge-disproportionation transition at TD = 340 K, and an antiferromagnetic transition at TN = 115 K. For temperatures T ≤ TD, the material is a small-gap insulator; the antiferromagnetic order is incommensurate, which implies competing exchange interactions between the Fe 4+ moments. The fully-deoxygenated compound (δ = 1) is highly insulating, and its Fe 3+ moments exhibit commensurate antiferromagnetic order below TN ∼ 600 K. Compounds with intermediate δ exhibit different order with lower TN , likely as a consequence of frustrated exchange interactions between Fe 3+ and Fe 4+ sublattices. A previous proposal that the magnetic transition temperature reaches zero is not supported.

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“…In the same way, systematic attention has been focused on the rich electrical and magnetic properties of perovskite like intergrowth structures of ferrites and their solid solutions [9][10][11][12][13][14]. As an example the existence of two P 2 /RS type iron strontium mixed oxide is reported, namely the Fe(IV) one Sr 3 Fe 2 O 7 [12] and the Fe(III) one Sr 3 Fe 2 O 6 [9].…”

Section: Introductionmentioning

confidence: 99%

“…As an example the existence of two P 2 /RS type iron strontium mixed oxide is reported, namely the Fe(IV) one Sr 3 Fe 2 O 7 [12] and the Fe(III) one Sr 3 Fe 2 O 6 [9]. Due to this and in the frame of our previous work on P/RS type chromium doped aluminates [15] and P 2 /RS chromium doped titanates [16], it was decided to look for compositions where it is possible to create mixed valence Fe(III) and Fe(IV) state of the iron atoms.…”

Section: Introductionmentioning

confidence: 99%

The solid solution Sr₃Ti_2-xFe_xO_7-δ (x ≤ 0.5): characterization of Fe (III) – Fe (IV) mixed valences

et al. 2016

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The results of a magneto chemical and Mössbauer characterization are reported for the solid solution Sr3Ti2-xFexO7-δ (x ≤ 0.5), the intergrowth of a double perovskite block and one rock-salt layer type. The charge compensation mechanism induced by the introduction of iron atoms in the matrix of Sr3Ti2O7 is sensitive to the conditions of synthesis, namely an oxidation process triggers the formation of mixed Fe(III)-Fe(IV) valences. The crystallographic characterization - variation of the cell parameters and structure calculations – brings evidence for the respective occurrence of mixed valences and oxygen vacancies which form in the middle plane of the double perovskite block. Ferromagnetic exchange interactions which are absent in the Fe(III) containing compositions, appear and progressively strengthen depending on the oxidizing treatment. They are ascribed to the presence of an increasing amount of Fe(IV) species. Remarkably, a mixed valence state of iron forms during annealing in air with an increasing contribution of the Fe(IV) species for the larger iron contents, as deduced from Mössbauer data.

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Structure and oxygen stoichiometry in Sr3Fe2O7−y, 0 ≤ y ≤ 1.0

Cited by 143 publications

References 8 publications

Synthesis and characterization of La0.8Sr1.2Co0.5M0.5O4−δ (M=Fe, Mn)

Synthesis and characterization of La0.8Sr1.2Co0.5M0.5O4−δ (M=Fe, Mn)

Magnetic phase diagram of Sr3Fe2O7−δ

The solid solution Sr₃Ti_2-xFe_xO_7-δ (x ≤ 0.5): characterization of Fe (III) – Fe (IV) mixed valences

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Structure and oxygen stoichiometry in Sr3Fe2O7−y, 0 ≤ y ≤ 1.0

Cited by 143 publications

References 8 publications

Synthesis and characterization of La0.8Sr1.2Co0.5M0.5O4−δ (M=Fe, Mn)

Synthesis and characterization of La0.8Sr1.2Co0.5M0.5O4−δ (M=Fe, Mn)

Magnetic phase diagram of Sr3Fe2O7−δ

The solid solution Sr3Ti2-xFexO7-δ (x ≤ 0.5): characterization of Fe (III) – Fe (IV) mixed valences

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The solid solution Sr₃Ti_2-xFe_xO_7-δ (x ≤ 0.5): characterization of Fe (III) – Fe (IV) mixed valences