Synthesis and characterization of perovskite-type SrxY1-xFeO3-δ (0.63 ≤ x < 1.0) and Sr0.75Y0.25Fe1-yMyO3-δ (M= Cr, Mn, Ni), (y=0.2, 0.33, 0.5)

Biendicho, J.J.; Shafeie, S.; Frenck, L.; Gavrilova, D.; Böhme, S.; Bettanini, A.M.; Svedlindh, P.; Hull, S.; Zhao, Z.; Istomin, S.Y.; Grins, J.; Svensson, G.

Авторы: Biendicho J.J., Shafeie S., Frenck L., Gavrilova D., Böhme S., Bettanini A.M., Svedlindh P., Hull S., Zhao Z., Istomin S.Ya, Grins J., Svensson G.
Журнал: Journal of Solid State Chemistry
Том: 200
Год издания: 2013
Издательство: Elsevier B.V.
Местоположение издательства: Netherlands
Первая страница: 30
Последняя страница: 38
DOI: 10.1016/j.jssc.2013.01.008
Аннотация: Oxygen-deficient ferrates with the cubic perovskite structure SrxY1-xFeO3-δ were prepared in air (0.71 ≤ x ≤ 0.91) as well as in N2 (x=0.75 and 0.79) at 1573K. The oxygen content of the compounds prepared in air increases with increasing strontium content from 3-δ=2.79(2) for x=0.75 to 3-δ=2.83(2) for x=0.91. Refinement of the crystal structure of Sr0.75Y0.25FeO2.79 using TOF neutron powder diffraction (NPD) data shows high anisotropic atomic displacement parameter (ADP) for the oxygen atom resulting from a substantial cation and anion disorder. Electron diffraction (ED) and high-resolution electron microscopy (HREM) studies of Sr0.75Y0.25FeO2.79 reveal a modulation along <100>p with G± ~0.4<100>p indicating a local ordering of oxygen vacancies. Magnetic susceptibility measurements at 5-390K show spin-glass behaviour with dominating antiferromagnetic coupling between the magnetic moments of Fe cations. Among the studied compositions, Sr0.75Y0.25FeO2.79 shows the lowest thermal expansion coefficient (TEC) of 10.5 ppm K-1 in air at 298-673K. At 773-1173K TEC increases up to 17.2 ppm K-1 due to substantial reduction of oxygen content. The latter also results in a dramatic decrease of the electrical conductivity in air above 673K. Partial substitution of Fe by Cr, Mn and Ni according to the formula Sr0.75Y0.25Fe1-yMyO3-δ (y=0.2, 0.33, 0.5) leads to cubic perovskites for all substituents with y=0.2. Their TECs are higher in comparison with un-doped Sr0.75Y0.25FeO2.79. Only M=Ni has increased electrical conductivity compared to un-doped Sr0.75Y0.25FeO2.79.
Добавил в систему: Истомин Сергей Яковлевич

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Synthesis and characterization of perovskite-type SrxY1-xFeO3-δ (0.63 ≤ x < 1.0) and Sr0.75Y0.25Fe1-yMyO3-δ (M= Cr, Mn, Ni), (y=0.2, 0.33, 0.5)статья

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