Synthesis and structure of Sr2MnGaO5+δ brownmillerites with variable oxygen content

Abakumov, Artem M.; Rozova, Marina G.; Alekseeva, Anastasia M.; Kovba, M. L.; Antipov, Evgeny V.; Lebedev, Oleg I.; Tendeloo, Gustaaf Van

doi:10.1016/s1293-2558(03)00112-2

Cited by 15 publications

(14 citation statements)

References 20 publications

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“…8) for both as-prepared and oxidized samples. In all cases, the obtained values are smaller than the spin-only values considering the relative quantities of high-spin 3d 5 (Table 7) is in agreement with the oxidation of some Fe 3+ and Mn 3+ ions, as detected by Mohr salt titrations and Mö ssbauer spectroscopy.…”

Section: Magnetization Measurementssupporting

confidence: 84%

“…Several studies on A 2 MnBO 5+d (A ¼ Ca, Sr; B ¼ Al, Ga) compounds showed the ability of the structure to accommodate oxygen, and compositions like Ca 2 MnAlO 5.5 [4] and Sr 2 MnGaO 5.5 [5] were obtained by oxidizing treatments of the as-prepared compounds A 2 MnBO 5 . In the case of the Ca 2 MnBO 5.5 compound, it represents the n ¼ 3 brownmillerite structure where Pollmann [14] and references therein.…”

Section: Introductionmentioning

confidence: 99%

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Structure and magnetic properties of Ca2Fe1−xMnxAlO5+δ

Carvalho

Ferreira

Waerenborgh³

et al. 2008

Journal of Solid State Chemistry

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Section: Magnetization Measurementssupporting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Structure and magnetic properties of Ca2Fe1−xMnxAlO5+δ

Carvalho

Ferreira

Waerenborgh³

et al. 2008

Journal of Solid State Chemistry

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“…The oxide Sr 2 MnGaO 5+d is characterised by a more complex dependence of the unit cell parameters on the oxidation state of manganese V Mn and oxygen content. 51,56 The unit cell volume, degree of its orthorhombic distortion and c parameter decrease regularly with an increase in d (Fig. 14, see Table . 3).…”

Section: The Crystal Structure Ofmentioning

confidence: 97%

“…For the oxidised phase Sr 2 MnGaO 5.5 , an orthorhombic structure was established 48 based on the neutron diffraction data (see Table 3). It is likely that discrepancies in the crystallographic symmetry suggested for this compound by different authors (see Refs 48,51,52,56) arise due to different procedures used for the preparation of different samples or variable oxygen content in these samples, which lies within the accuracy limits of the available determination methods.…”

Section: The Crystal Structure Ofmentioning

confidence: 99%

“…Sr 2 MnGaO 5+d with an intermediate value of the oxygen overstoichiometry index 0 < d < 0.5 can be prepared by reduction of fully oxidised Sr 2 MnGaO 5.5 in a closed circuit with a preset partial oxygen pressure. 51 In this method, the annealing is performed in a circulating flow of an argon ± oxygen mixture; the required partial oxygen pressure is kept constant using a Cu/Cu 2 O getter and controlled by an electrochemical cell with a solid oxygen-ionic electrolyte. A series of phases with d = 0.13 (logp O 2 = 75.…”

Section: Synthesis Of Mn-containing Brownmilleritesmentioning

confidence: 99%

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Complex manganese oxides with the brownmillerite structure: synthesis, crystal chemistry and properties

Abakumov¹,

Rozova²,

Антипов³

2004

Russ. Chem. Rev.

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Structural features and methods for the synthesis of Structural features and methods for the synthesis of complex manganese oxides with the brownmillerite structure complex manganese oxides with the brownmillerite structure) and of their derivatives = Ga, Al) and of their derivatives are surveyed. Modern approaches to the description of crystal are surveyed. Modern approaches to the description of crystal structures containing various types of chains of tetrahedra are structures containing various types of chains of tetrahedra are considered and possible ordering patterns of these chains are considered and possible ordering patterns of these chains are discussed. The effects of the electronic structure and crystal discussed. The effects of the electronic structure and crystal chemical properties of the B chemical properties of the B H cations on the possibility of for-cations on the possibility of formation of a layered ordered structure is noted. The emphasis is mation of a layered ordered structure is noted. The emphasis is placed on the anion non-stoichiometry of the brownmillerite placed on the anion non-stoichiometry of the brownmillerite phases and the influence of the excess oxygen (fluorine) on the phases and the influence of the excess oxygen (fluorine) on the structure of the compounds. A comparative analysis of properties structure of the compounds. A comparative analysis of properties of oxygen-and fluorine-doped brownmillerites is given. The data of oxygen-and fluorine-doped brownmillerites is given. The data on the magnetic structures, transport and magnetoresistive prop-on the magnetic structures, transport and magnetoresistive properties of Mn-containing brownmillerites are generalised. The erties of Mn-containing brownmillerites are generalised. The bibliography includes 74 references bibliography includes 74 references. .

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Synthesis, Structure and Superconducting/Magnetic Properties of Cu‐ and Mn‐based Oxyfluorides

Antipov

Abakumov

2010

Functionalized Inorganic Fluorides

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Synthesis and structure of Sr2MnGaO5+δ brownmillerites with variable oxygen content

Cited by 15 publications

References 20 publications

Structure and magnetic properties of Ca2Fe1−xMnxAlO5+δ

Structure and magnetic properties of Ca2Fe1−xMnxAlO5+δ

Complex manganese oxides with the brownmillerite structure: synthesis, crystal chemistry and properties

Synthesis, Structure and Superconducting/Magnetic Properties of Cu‐ and Mn‐based Oxyfluorides

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