Abstract
The influence of the substrate on the structure and the microstructure of Ca2Fe2O5 (CFO) thin films has been investigated by transmission electron microscopy. Ca2Fe2O5 films have been deposited by pulsed laser deposition on (001)-oriented SrTiO3 (STO), LaAlO3 (LAO), and (LaAlO3)0.3(SrAl0.5Ta0.5O3)0.7 (LSAT) substrates. Minor variations in the lattice mismatch of the CFO film with the three different substrates strongly determine the growth direction of the film. The misfit stress also promotes the development of strain accommodation mechanisms. (101) “orthogonal” twins are formed to accommodate the misfit in epitaxial films of CFO on STO(001) and LSAT(001), while CFO films on LAO(001) develop 90° rotation twins leading to film fragmentation into grains. The growth direction of the CFO film on LAO not only depends on the lattice mismatch but also on the lattice energy involved at the initial stages of the growth process. Our results also evidence the formation of an unexpected phase with composition Ca3Fe2O7 in CFO thin films on STO and LSAT. High-resolution microscopy and electron diffraction suggest that this structure belongs to the Ruddlesden–Popper family.
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