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Mapping Chemical Disorder and Ferroelectric Distortions in the Double Perovskite Compound Sr2-xGdxMnTiO6 by Atomic Resolution Electron Microscopy and Spectroscopy

Published online by Cambridge University Press:  01 April 2014

Neven Biškup ,
Inmaculada Álvarez-Serrano ,
Maria Veiga ,
Alberto Rivera-Calzada ,
Mar Garcia-Hernandez ,
Stephen J. Pennycook  and
Maria Varela
Neven Biškup*
Affiliation:
Departamento de Física Aplicada III & Instituto Pluridisciplinar, Universidad Complutense de Madrid, 28040 Madrid, Spain Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
Inmaculada Álvarez-Serrano
Affiliation:
Departamento de Química Inorganica, Universidad Complutense de Madrid, 28040 Madrid, Spain
Maria Veiga
Affiliation:
Departamento de Química Inorganica, Universidad Complutense de Madrid, 28040 Madrid, Spain
Alberto Rivera-Calzada
Affiliation:
Departamento de Física Aplicada III & Instituto Pluridisciplinar, Universidad Complutense de Madrid, 28040 Madrid, Spain
Mar Garcia-Hernandez
Affiliation:
Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco 28049, Spain
Stephen J. Pennycook
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
Maria Varela
Affiliation:
Departamento de Física Aplicada III & Instituto Pluridisciplinar, Universidad Complutense de Madrid, 28040 Madrid, Spain Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
*
*Corresponding author.[email protected]
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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.

Keywords

double perovskiteelectroresistanceferroelectric displacementatomic resolution electron microscopyEELS
Type
EDGE Special Issue
Information
Microscopy and Microanalysis , Volume 20 , Issue 3 , June 2014 , pp. 731 - 739
Copyright
© Microscopy Society of America 2014 

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