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Issue 20, 2012
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Investigation of microstructure in ferroelectric lead-free La2Ti2O7 thin film grown on (001)-SrTiO3 substrate

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Abstract

(012)-Oriented La2Ti2O7 (LTO) thin films with perovskite layered/monoclinic structure (a = 7.825 Å, b = 5.532 Å, c = 12.938 Å, β = 98.0°) have been deposited on (001)-oriented doped Nb:SrTiO3 (STO) substrates by a sol–gel method coupled to the spin-coating technique. Rocking curves measurements evidence the existence of four crystallographic domains in these films, the (012)LTO planes for each domain being slightly disoriented from 2.3° with respect to the plane of the substrate, as confirmed by reciprocal space map performed around the (002) reflection of the substrate. Pole figure measurements permit the conclusion that the crystallographic relationships between the film and substrate are [001]STO//[100]LTO, [010]STO//[01[2 with combining macron]]LTO and (100)STO//(012)LTO. Using high-resolution X-ray diffraction, the (025)LTO-reflection can be distinguished on 2θ/ω-scan pattern recorded in parallel beam geometry. As highlighted by both rocking-curve measurements and reciprocal space map recording, the (025)LTO planes for each of the four populations are disoriented from 4.1° with respect to the plane of the substrate. As demonstrated, this angle's value is a signature of the existence of the fourfold disoriented crystalline domain structure. From piezoresponse force microscopy experiments, intermediate directions of the polarization vectors between the normal and the plane of the substrate are revealed. On the other hand, piezoloops recorded on nanoscale unambiguously confirm the ferroelectric behavior of these films.

Graphical abstract: Investigation of microstructure in ferroelectric lead-free La2Ti2O7 thin film grown on (001)-SrTiO3 substrate

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Publication details

The article was received on 06 Jul 2012, accepted on 30 Jul 2012 and first published on 02 Aug 2012


Article type: Paper
DOI: 10.1039/C2CE26078F
Citation: CrystEngComm, 2012,14, 6524-6533
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    Investigation of microstructure in ferroelectric lead-free La2Ti2O7 thin film grown on (001)-SrTiO3 substrate

    Z. Shao, S. Saitzek, P. Roussel, A. Ferri, O. Mentré and R. Desfeux, CrystEngComm, 2012, 14, 6524
    DOI: 10.1039/C2CE26078F

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