期刊
JEMS 2012 - JOINT EUROPEAN MAGNETIC SYMPOSIA
卷 40, 期 -, 页码 -出版社
E D P SCIENCES
DOI: 10.1051/epjconf/20134015005
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Orthorhombic lanthanum orthoferrites La0.8Sr0.2Fe1-yCuyO3-w (y = 0 and 0.10) have been studied using X-rays and neutron powder diffraction ( XRPD and NPD), magnetization measurements and Fe-57 Mossbauer spectroscopy. Rietveld refinements on XRPD and NPD data show that they adopt an orthorhombic ABO(3) perovskite symmetry with La/Sr and Fe/Cu atoms randomly distributed on crystal A and B sites, respectively. The magnetic structure at room temperature is antiferromagnetic, with the Fe/Cu magnetic moments aligned along the a axis. Magnetization curves versus temperature show that the compounds exhibit an overall antiferromagnetic and a weak ferromagnetic behaviour in the range 5-298 K. Fe-57 Mossbauer spectroscopy measurements indicate that Fe3+ and Fe5+ ions coexist in both compounds, and the relative percentage of Fe5+ is almost the same at 77 and 170 K, rejecting a charge disproportion mechanism.
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