Polarization states of polydomain epitaxial Pb(Zr_1-xTi_x)O_3 thin films and their dielectric properties

Kukhar, V. G.; Pertsev, N.; Kohlstedt, H.; Waser, R.

doi:10.1103/PhysRevB.73.214103

Journal Article

PreJuSER-56194

Polarization states of polydomain epitaxial Pb(Zr_1-xTi_x)O_3 thin films and their dielectric properties

Kukhar, V. G.FZJ* ; Pertsev, N.FZJ* ; Kohlstedt, H.FZJ* ; Waser, R.FZJ*

2006
APS College Park, Md.

Physical review / B 73(21), 214103 (2006) [10.1103/PhysRevB.73.214103]

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Please use a persistent id in citations: http://hdl.handle.net/2128/7674 doi:10.1103/PhysRevB.73.214103

Abstract: Ferroelectric and dielectric properties of polydomain (twinned) single-crystalline Pb(Zr1-xTix)O-3 thin films are described with the aid of a nonlinear thermodynamic theory, which has been developed recently for epitaxial ferroelectric films with dense laminar domain structures. For Pb(Zr1-xTix)O-3 (PZT) films with compositions x=0.9, 0.8, 0.7, 0.6, 0.5, and 0.4, the "misfit strain-temperature" phase diagrams are calculated and compared with each other. It is found that the equilibrium diagrams of PZT films with x >= 0.7 are similar to the diagram of PbTiO3 films. They consist of only four different stability ranges, which correspond to the paraelectric phase, single-domain tetragonal ferroelectric phase, and two pseudotetragonal domain patterns. In contrast, at x=0.4, 0.5, and 0.6, the equilibrium diagram displays a rich variety of stable polarization states, involving at least one monoclinic polydomain state. Using the developed phase diagrams, the mean out-of-plane polarization of a poled PZT film is calculated as a function of the misfit strain and composition. Theoretical results are compared with the measured remanent polarizations of PZT films grown on SrTiO3. Dependence of the out-of-plane dielectric response of PZT films on the misfit strain in the heterostructure is also reported.

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