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Issue 47, 2012
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Stability limit of the layered-perovskite structure in Ln2Ti2O7 (Ln = lanthanide) thin films grown on (110)-oriented SrTiO3 substrates by the sol–gel route

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Abstract

The stability limit between the layered-perovskite and pyrochlore structures was investigated for Ln2Ti2O7 (Ln = lanthanide) thin films grown on (110)-oriented SrTiO3 substrate by the sol–gel route. In bulk, for standard conditions of pressure and temperature, these oxides adopt the layered-perovskite structure for Ln = La to Nd while they crystallize in the pyrochlore one for Sm to Lu. When grown in thin films on (110)-oriented SrTiO3 substrates, the frontier separating these two structures is shifted. High-resolution X-ray diffraction measurements evidence the stabilization of a metastable (00l) oriented layered-perovskite structure for Sm2Ti2O7, Eu2Ti2O7 and Gd2Ti2O7. Such stabilization is explained by a combination of both the strains induced by the substrate in the film and the good lattice match between the substrate and the metastable layered-perovskite oxide. The stabilization of layered-perovskite structures in thin films opens interesting perspectives in terms of development of new ferroelectric/piezoelectric devices, keeping in mind that the isostructural La2Ti2O7 and Nd2Ti2O7 possess a very high Curie temperature (Tc ≈ 1500 °C). Finally, the role played by the lanthanide precursor (nitrate or chloride) in the stabilization of the layered-perovskite structure is highlighted and prediction for stabilization of other new layered-perovskite compounds in the Ln2B2O7 (B = Zr, Mn) system for thin films deposited on the (110)-oriented SrTiO3 substrate is reported.

Graphical abstract: Stability limit of the layered-perovskite structure in Ln2Ti2O7 (Ln = lanthanide) thin films grown on (110)-oriented SrTiO3 substrates by the sol–gel route

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Publication details

The article was received on 18 Jul 2012, accepted on 01 Oct 2012 and first published on 01 Oct 2012


Article type: Paper
DOI: 10.1039/C2JM34729F
Citation: J. Mater. Chem., 2012,22, 24894-24901
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    Stability limit of the layered-perovskite structure in Ln2Ti2O7 (Ln = lanthanide) thin films grown on (110)-oriented SrTiO3 substrates by the sol–gel route

    Z. Shao, S. Saitzek, P. Roussel and R. Desfeux, J. Mater. Chem., 2012, 22, 24894
    DOI: 10.1039/C2JM34729F

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