Biskup Zaja, NevenkoÁlvarez Serrano, InmaculadaVeiga, MaríaRivera Calzada, Alberto CarlosGarcia Hernandez, MarPennycook, Stephen J.Varela Del Arco, María2024-06-172024-06-172014-04-01Biškup, 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, 731–7391431-927610.1017/s1431927614000506https://hdl.handle.net/20.500.14352/105022In 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.engjournal article1435-8115http://doi.org/10.1017/s1431927614000506https://academic.oup.com/mam/article-abstract/20/3/731/6932217?redirectedFrom=fulltextopen access538.9Atomic resolution electron microscopyDouble perovskiteEELSElectroresistanceFerroelectric displacementFísica de materiales2211 Física del Estado Sólido