The ferroelastic twin-domain structures and piezoelectric properties were investigated in epitaxial Pb(Zr-0.35,Ti-0.65)O-3 thin films with various c-domain volume fractions by metal organic chemical vapor deposition on (100)(c)SrRuO3/(100)SrTiO3 substrates. The domain structures could be characterized into three regions: a-domain dominant, c-domain dominant, and their mixed domain regions. The mixed domain structure is quite unusual but formed a bilayer with two regions of different a/c domain proportions: the bottom layer is the a(1)-a(2) domain structure and top layer is the a-c domain structure. The films of the mixed region have attained largest piezoelectric coefficients, d(33), presumably due to enhanced a-to-c domain switching. (c) 2006 American Institute of Physics.
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