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

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Abstract

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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Publication details

The article was received on 30 Nov 2011, accepted on 05 Mar 2012 and first published on 12 Apr 2012


Article type: Paper
DOI: 10.1039/C2JM16261J
Citation: J. Mater. Chem., 2012,22, 9806-9812
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    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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