%0 Journal Article
%A Kukhar, V. G.
%A Pertsev, N.
%A Kohlstedt, H.
%A Waser, R.
%T Polarization states of polydomain epitaxial Pb(Zr_1-xTi_x)O_3 thin films and their dielectric properties
%J Physical review / B
%V 73
%N 21
%@ 1098-0121
%C College Park, Md.
%I APS
%M PreJuSER-56194
%P 214103
%D 2006
%Z Record converted from VDB: 12.11.2012
%X 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.
%K J (WoSType)
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000238696200035
%R 10.1103/PhysRevB.73.214103
%U https://juser.fz-juelich.de/record/56194