ChemInform Abstract: Study of the Structural, Magnetic, and Electrical Properties of the 5H Hexagonal‐Type Perovskite BaMn_0.2Co_0.8O_2.80.

Abstract

0.8 O 2.80 . -The new title compound is prepared from a ground stoichiometric mixture of BaCO3, MnCO3, and Co3O4 (1000°C, 2 d). The samples are characterized by XRD, neutron diffraction, SAED, HREM, EELS, magnetic measurements, and impedance spectroscopy. BaMn0.2Co0.8O2.80 crystallizes in the hexagonal space group P3m1. The structure consists of [MnCo2O12] blocks of three face-sharing octahedra linked by corners to two unconnected [CoO 4 ] tetrahedra. BaMn0.2Co0.8O2.80 exhibits internal barrier layer capacitor behavior with a high and temperature-stable permittivity close to 10000. -(MIRANDA, L.; FETEIRA, A.; SINCLAIR, D. C.; GARCIA HERNANDEZ, M.; BOULAHYA, K.; HERNANDO, M.; VARELA, A.; GONZALEZ-CALBET, J. M.; PARRAS*, M.; Chem. Mater. 20