Structure determination of a brownmillerite Ca2Co2O5 thin film by Precession Electron Diffraction
P. Boullay, V. Dorcet, O. Perez, C. Grygiel, W. Prellier, B. Mercey, and M. Hervieu
TL;DR
This study successfully determines the structure of a metastable Ca2Co2O5+d brownmillerite thin film using precession electron diffraction, revealing substrate-induced stabilization of an oxygen-deficient phase.
Contribution
The paper introduces a novel application of precession electron diffraction to solve the structure of a metastable thin film phase stabilized by substrate strain.
Findings
The Ca2Co2O5+d phase has specific lattice parameters and symmetry.
Substrate strain stabilizes a metastable brownmillerite structure.
The structure differs from related bulk materials.
Abstract
Calcium cobaltite thin films with a ratio Ca/Co=1 were grown on (101)-NdGaO3 substrate by the pulsed laser deposition technique. The structure of the deposited metastable phase is solved using a precession electron diffraction 3D dataset recorded from a cross-sectional sample. It is shown that an ordered oxygen-deficient Ca2Co2O5+d perovskite of the brownmillerite-type with lattice parameters a= 0.546nm, b=1.488nm and c=0.546nm (SG: Ibm2) has been stabilized using the substrate induced strain. The structure and microstructure of this metastable cobaltite is further discussed and compared to related bulk materials based on our transmission electron microscopy investigations
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