Mapping chemical disorder and ferroelectric distortions in the double perovskite compound Sr2-xGdxMnTiO6 by atomic resolution electron microscopy and spectroscopy
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2014
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Oxford University Press
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Biškup, N., Álvarez-Serrano, I., Veiga, M., Rivera-Calzada, A., Garcia-Hernandez, M., Pennycook, S. J. & Varela, M. (2014). Mapping Chemical Disorder and Ferroelectric Distortions in the Double Perovskite Compound Sr 2- x Gd x MnTiO 6 by Atomic Resolution Electron Microscopy and Spectroscopy. Microscopy and Microanalysis 20, 731–739
Abstract
In this work we report a study of the chemical and structural order of the double perovskite compound Sr2-xGdxMnTiO6 for compositions x = 0, 0.25, 0.5, 0.75, and 1. A noticeable disorder at the B-site in the Mn and Ti sublattice is detected at the atomic scale by electron energy-loss spectroscopy for all x values, resulting in Mn-rich and Ti-rich regions. For x >= 0.75, the cubic unit cell doubles and lowers its symmetry because of structural rearrangements associated with a giant ferroelectric displacement of the perovskite B-site cation. We discuss this finding in the light of the large electroresistance observed in Sr2-xGdxMnTiO6, x >= 0.75.