Synthesis and characterization of Sr0.75Y0.25C1-xMxO2.625+delta (M = Ga, 0.125 <= x <= 0.500 and M = Fe, 0.125 <= x <= 0.875)статья

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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.

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[1] Synthesis and characterization of sr0.75y0.25c1-xmxo2.625+delta (m = ga, 0.125 <= x <= 0.500 and m = fe, 0.125 <= x <= 0.875) / F. Lindberg, O. A. Drozhzhin, S. Y. Istomin et al. // Journal of Solid State Chemistry. — 2006. — Vol. 179, no. 5. — P. 1434–1444. The effect of replacing Co3+ by Ga3+ and Fe3+ in the perovskite-related tetragonal phase Sr0.75Y0.25CoO2.625 with unit cell parameters: a = 2a(p), and c = 4a(p) (314 phase) has been investigated. The 314 phase is formed by Sr0.75Y0.25Co1-xMxO2.625+delta with x <= 0.375 for M = Ga and x <= 0.625 for M = Fe. High-resolution transmission electron microscopy and electron diffraction revealed frequent microtwinning in the iron-containing compounds, in contrast to the Ga-substituted 314 phases. Diffraction experiments and electron microscope images indicated that at higher Fe contents, 0.75 <= x <= 0.8757 a disordered cubic perovskite structure forms. The crystal structures of Sr0.75Y0.25Co0.75Ga0.25O2.625 and Sr0.75Y0.25Co0.5Fe0.5O2.625+delta were refined using neutron powder diffraction data. It Was found that the oxygen content of Sr0.75Y0.25Co0.5Fe0.5O2.625+delta is higher than in Fe-free 314 phase, so that delta corresponds to 0.076, whereas delta = 0 in Sr0.75Y0.25Co0.75Ga0.25O2.625+delta Magnetization measurements on the unsubstituted Sr0.7Y0.3CoO2.62 and Ga-substituted Sr0.75Y0.25Co0.75Ga0.25O2.625 compounds indicate the presence of a ferromagnetic-like contribution to the measured magnetization at 320 and 225 K, respectively, while replacing Co by Fe leads to the suppression of this contribution. A neutron diffraction study shows that the Si0.75Y0.25Co0.5Fe0.5O2.625+delta compound is G-type antiferromagnetic at room temperature, whereas Sr0.75Y0.25Co0.75Ga0.25O2.625 does not exhibit magnetic ordering at room temperature. (C) 2006 Elsevier Inc. All rights reserved. [ DOI ]

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