Abstract
Ferroelectric PbTiO3 films have been formed on SrTiO3(100) substrates using ArF excimer laser ablation as a function of substrate temperature with oxygen ( O2+8%O3) pressure. Perovskite PbTiO3 is formed around the substrate temperature of 450° C and oxygen pressure of 10∼40 mTorr. Pyrochlore Pb2Ti2O7-x {111}, on the other hand, is formed at higher temperature and lower oxygen pressure than the perovskite phase. The {100}-oriented pyrochlore is formed at lower temperature (around 400° C) and higher oxygen pressure. In addition, PbO films are obtained under similar formation conditions as those of the perovskite phase. This result suggests that PbO formation plays an important role in the construction of the PbTiO3 structure.
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