Dependence of the structure and electronic state of SrFeOx (2.5 ≤ x ≤ 3) on composition and temperature

Takano, Mikio; Okita, Takushi; Nakayama, Noriaki; Bandō, Yoshichika; Takeda, Yasuo; Yamamoto, Osamu; Goodenough, John B

doi:10.1016/0022-4596(88)90063-1

Cited by 155 publications

(73 citation statements)

References 25 publications

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“…In this respect it should be noted that J.-C. Grenier and P. Hagenmuller in [19] have proposed a high-temperature structure of the "cubic" SrFeO 2.5+x perovskite, consisting of disoriented brownmillerite-type domains with oxygen excess localized in the domain walls. This assumption was confirmed by M. Takano by means of high-temperature Mossbauer spectroscopy [20]. In [21], S. Adler, with the help of high-temperature NMR, showed the co-existence of both mobile and immobile oxygen ions in the perovskites at T>800°C, this fact is also in agreement with the model of microdomain structure of high-temperature perovskite phases.…”

Section: Resultssupporting

confidence: 72%

Investigation of the microstructural features of SrCo0.8Fe0.2O3−δ perovskite

Belen'kaya

Cherepanova

Nemudry

2012

J Solid State Electrochem

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Section: Resultssupporting

confidence: 72%

Investigation of the microstructural features of SrCo0.8Fe0.2O3−δ perovskite

Belen'kaya

Cherepanova

Nemudry

2012

J Solid State Electrochem

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“…© 1997 International Union of Crystallography Printed in Great Britain -all rights reserved has long been realized by Goodenough who has written extensively on the magnetic (Goodenough, 1963) and electrical (Goodenough, 1971;Takano et al, 1988) properties of perovskites. Goodenough and others have also compared different perovskite compounds in an attempt to understand the effects of bonding on the crystal structure and properties of solid-state materials (Goodenough, 1967;Choy, Park, Hong & Kim, 1994).…”

Section: Introductionmentioning

confidence: 99%

Octahedral Tilting in Perovskites. II. Structure Stabilizing Forces

Woodward¹

1997

Acta Crystallogr Sect B

621

480

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The 23 Glazer tilt systems describing octahedral tilting in perovskites have been investigated. The various tilt systems have been compared in terms of their A-cation coordination and it is shown that those tilt systems in which all the A-cation sites remain crystallographically equivalent are strongly favored, when all the A sites are occupied by the same ion. Calculations based on both ionic and covalent models have been performed to compare the seven equivalent A-site tilt systems. Both methods predict that when the tilt angles become large, the orthorhombic a+b-b -tilt system will result in the lowest energy structure. This tilt system gives the lowest energy structure because it maximizes the number of short A---O interactions. The rhombohedral a-a-a-tilt system gives a structure with a slightly lower Madelung energy, but increased ion-ion repulsions destabilize this structure as the tilt angles increase. Consequently, it is stabilized by highly charged A cations and small to moderate tilt angles. The ideal cubic a°a°a° tilt system is only observed when stabilized by oversized A cations and/or M---O 7r-bonding. Tilt systems with nonequivalent A-site environments are observed when at least two A cations with different sizes and/or bonding preferences are present. In these compounds the ratio of large-to-small cations dictates the most stable tilt system.

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“…In the Sr-Fe-O system, iron atoms adopt the IV, V and VI coordination in the perovskite-related structures SrFeO 3Àd [5][6][7] and a similar behaviour is observed in the layered Ruddlesden Popper (RP)-type phases Sr 2 FeO 4Àd [8] and Sr 3 Fe 2 O 6Àd, [9] which are built up from the intergrowth of one rock salt (RS)-type and one perovskite-type layers. Note that these two last compounds are labelled 0201-and 0212-type, respectively, adopting the notation of the superconducting cuprates and related compounds.…”

Section: Structural Mechanisms Of the Complex Sr 4 Fe 6 O 13àd -Relatmentioning

confidence: 69%

Decrypting the TEM Images for Deciphering the Microstructural Code of Complex Oxides

Hervieu

Martin

Pérez

et al. 2008

Chemistry A European J

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The knowledge of the structure of the real solids is required for achieving the desired architectures in the research of new materials and/or optimizing the relationships between structure and properties. Understanding complex oxides needs accurate characterization at different length scales and the combined application of all solid-state techniques. Deciphering the relationships between all this information provides codes that allow the identification of the different structural levels, their roles and the way they interact. These step-by-step routes are illustrated through two basic mechanisms of solid-state chemistry: to determine the building units of one complex oxide in order to predict the existence of other arrangements on the one hand and to correlate complex ordering phenomena, such as those involving charges, orbitals and spins of manganese atoms in perovskite-type manganites on the other hand.

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Dependence of the structure and electronic state of SrFeOx (2.5 ≤ x ≤ 3) on composition and temperature

Cited by 155 publications

References 25 publications

Investigation of the microstructural features of SrCo0.8Fe0.2O3−δ perovskite

Investigation of the microstructural features of SrCo0.8Fe0.2O3−δ perovskite

Octahedral Tilting in Perovskites. II. Structure Stabilizing Forces

Decrypting the TEM Images for Deciphering the Microstructural Code of Complex Oxides

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