期刊
MICROSCOPY AND MICROANALYSIS
卷 20, 期 3, 页码 731-739出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S1431927614000506
关键词
double perovskite; electroresistance; ferroelectric displacement; atomic resolution electron microscopy; EELS
资金
- ORNL's Center for Nanophase Materials Sciences (CNMS) - Scientific User Facilities Division, Office of Basic Energy Sciences, US Department of Energy
- ERC [STEMOX 739239, MAT2010-20117]
- [MAT2011-27470-C02-02]
- [CSD2009-00013]
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.
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