Abstract
The role of cobalt substitution in the crystal structure and piezo/ferroelectric properties of BiFeO3 (BFO) thin films was studied. With the aid of epitaxial strain, (1 − x)BiFeO3–xBiCoO3 (BFCO) (0 ≤ x ≤ 0.12) films were stabilized on SrTiO3 substrates, and an enhancement in their piezoresponses was observed. In the x = 0.15 BFCO film, an unconventional strain relaxation behavior, resulting in V-shaped domains of a “giant-c/a” phase of approximately 1.25, was observed. This observation demonstrates that the crystal structure and piezo/ferroelectric properties of BFO can be finely tuned by a combination of cobalt substitution and epitaxial strain.
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