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American Chemical Society, Chemistry of Materials, 4(25), p. 548-554, 2013

DOI: 10.1021/cm303609r

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Direct Atomic Observation in Powdered 4H-Ba0.8Sr0.2Mn0.4Fe0.6O2.7

Journal article published in 2013 by María Hernando, Laura Miranda, Aurea Varela, Khalid Boulahya, Sorin Lazar, Derek C. Sinclair, José M. González-Calbet ORCID, Marina Parras
This paper was not found in any repository; the policy of its publisher is unknown or unclear.
This paper was not found in any repository; the policy of its publisher is unknown or unclear.

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Abstract

A new hexagonal polytype in the BaMn1-xFexO3-δ system has been stabilized. Powdered Ba0.8Sr0.2MnIV0.4FeIII0.6O2.70 crystallizes in the 4H hexagonal polytype (space group P63/mmc) according to X-ray diffraction. HAADF images and chemical maps with atomic resolution have been obtained by combining Cs-corrected electron microscopy and EELS spectroscopy. The structure is formed by dimers of face-sharing octahedra linked by corners. EELS data show a random distribution of the transition metals ions identified by Fe and Mn-L2,3 chemical maps. A systematic difference in contrast observed in the O–K signal mapping suggests that anion deficiency is randomly located along the hexagonal layers in agreement with ND data. The magnetic structure consists of ferromagnetic sheets with the magnetic moments aligned along the x-axis and coupled antiferromagnetically along the c-axis.