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Issue 19, 2012
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Evidence of ferroelectricity in metastable Sm2Ti2O7 thin film

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The synthesis by the sol–gel route of metastable Sm2Ti2O7 thin film is reported. While for standard conditions of pressure and temperature, the Sm2Ti2O7 compound crystallizes in a cubic/pyrochlore structure, in the form of a thin film (grown on (110)-oriented SrTiO3 substrate), a monoclinic/layered perovskite structure is stabilized by strain effects induced by the substrate. Under these conditions, (00l)-oriented Sm2Ti2O7 oxide is isostructural to ferroelectric Ln2Ti2O7 (with Ln = La, Ce, Pr and Nd) phases, which is already well known. Studies by Selected Area Electron Diffraction (SAED) reveal the existence of a systematically twinned structure and the presence of a fault in the stacking of the perovskite layers. Piezoresponse Force Microscopy (PFM) measurements confirm undoubtedly the ferroelectricity in this metastable phase.

Graphical abstract: Evidence of ferroelectricity in metastable Sm2Ti2O7 thin film

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Article information

30 Nov 2011
05 Mar 2012
First published
12 Apr 2012

J. Mater. Chem., 2012,22, 9806-9812
Article type

Evidence of ferroelectricity in metastable Sm2Ti2O7 thin film

Z. Shao, S. Saitzek, A. Ferri, M. Rguiti, L. Dupont, P. Roussel and R. Desfeux, J. Mater. Chem., 2012, 22, 9806
DOI: 10.1039/C2JM16261J

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