ChemInform Abstract: Mn‐Rich BaMn_1‐xFe_xO_3‐δ Perovskite Revisited: Structural, Magnetic, and Electrical Propertis of Two New 6H′ Polytypes.

Abstract

. -The crystal and magnetic structures and electrical properties of BaMn0.85Fe0.15O2.87 and BaMn0.6Fe0.4O2.72, two new compounds in the title system, are characterized by X-ray, electron, and neutron diffraction, HREM, Moessbauer spectroscopy, impedance spectroscopy, and magnetization measurements. The compounds crystallize in the 6H' hexagonal polytype in the space group P6m2. The structure contains tetramers and dimers of face-sharing octahedra that are linked by corners. The magnetic structure is formed by ferromagnetic sheets stacked antiferromagnetically. Both compounds behave as leaky insulators at room temperature. -(MIRANDA, L.; SINCLAIR, D. C.; HERNANDO, M.; VARELA, A.; WATTIAUX, A.; BOULAHYA, K.; GONZALEZ-CALBET, J. M.; PARRAS*, M.; Chem. Mater.