Microstructure and secondary phases in epitaxial LaBaCo2O5.5 + δ thin films

doi:10.1016/j.jmst.2016.09.027

Abstract

Abstract:

Aberration-corrected scanning transmission electron microscopy was employed to investigate the microstructures and secondary phases in LaBaCo₂O_{5.5 +}_δ (LBCO) thin films grown on SrTiO₃ (STO) substrates. The as-grown films showed an epitaxial growth on the substrates with atomically sharp interfaces and orientation relationships of [100]_LBCO//[100]_STO and (001)_LBCO//(001)_STO. Secondary phases were observed in the films, which strongly depended on the sample fabrication conditions. In the film prepared at a temperature of 900 °C, nano-scale CoO pillars nucleated on the substrate, and grew along the [001] direction of the film. In the film grown at a temperature of 1000 °C, isolated nano-scale Co₃O₄ particles appeared, which promoted the growth of {111} twinning structures in the film. The orientation relationships and the interfaces between the secondary phases and the films were illustrated, and the growth mechanism of the film was discussed.

Key words: Nano-structure, Faceted interfaces, Secondary phase growth, Epitaxial thin film, Microstructure, Aberration-corrected scanning transmission electron microscopy

Jiangbo Lu, Lu Lu, Sheng Cheng, Ming Liu, Chunlin Jia. Microstructure and secondary phases in epitaxial LaBaCo₂O_{5.5 +}_δ thin films[J]. J. Mater. Sci. Technol., 2018, 34(2): 398-402.

Figures/Tables 4

Fig. 1. (a) HAADF image of an FIB-prepared cross-sectional lamella of the LBCO film grown at 900 °C. Inset shows the corresponding [110] zone axis SAED patterns from both film and substrate. (b) Low magnification HAADF image of the columnar structure. (c) Atomic resolution HAADF image of a boundary between columns taken along the [110]LBCO zone axis.

Fig. 2. (a) Atomic resolution HAADF image of a dark contrast region at the interface between the film and substrate. (b) FFT (fast Fourier transformation) image from the region marked by white square in (a).

Fig. 4. (a) Atomic resolution HAADF image of a region close to the interface between the film and the substrate. (b) FFT (fast Fourier transformation) image from the region with dark contrast marked by a white square in (a). (c) {111} twinning structures in film matrix associated with the intergrown secondary phase particle.

Fig. 5. XRD patterns of the LBCO films grown at different temperatures: (a) 900 °C, (b) 1000 °C.

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Microstructure and secondary phases in epitaxial LaBaCo₂O_{5.5 +}_δ thin films

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