MS16-P04 Pre-transitional processes in lead zirconate doped by Ti studied by diffuse and inelastic X-ray scatteringLead-zirconate titanate (PbZr1−xTixO3, PZT) is one of the most actively studied and widely used ferroelectric materials. One of the reasons of the interest is a complex phase diagram of lead zirconate and lead titanate solid solution, which illustrates variety of physical properties and crystal structures depending on titanium concentration. Other reasons of popularity are high piezolelectric properties, demonstrated by PZT around morthotropic phase boundary, and prospects of application of antiferrolectric properties , demonstrated by PZT with low Ti concentration.
Pure lead zirconate (x=0) is the prototypical antiferroelectric material. Between the cubic perovskite paraelectric phase and the antiferroelectric phase, in the narrow temperature range, intermediate ferroelectric phase exists. Addition of titanium increases the temperature range of stability of this phase. Cubic-to-intermediate phase transition is accompanied by doubling of the cell parameters of the paraelectric cubic lattice along two directions  and results in the appearance of M-superstructure with coordinate (H±1/2 K±1/2 0) in the diffraction pattern. Observation of additional satellites around M-point by electron diffraction  results in conclusion about complex domain pattern, characterized by antiphase domain boundary in lead displacement.
Recent studies  of pure lead zirconate reveals complex pattern of dynamical correlations in paraelectric phase. Diffuse scattering distribution indicates disordering of oxygen octahedral tilts and Pb displacements is shown in the high-temperature cubic phase. To study temperature behavior of these correlations X-ray diffuse scattering measurements have been done in wide temperature range in PZT with small titanium concentration (x < 0.04). To characterize dynamical origin of DS lattice dynamics have been studied using inelastic X-ray scattering. Obtained temperature evolution of DS and pre-transitional dynamical peculiarities will be shown in presentation and discussed in the context of mode coupling.
Andronikova D. acknowledges support by Russian President Grants No. SP-3762.2018.5
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Keywords: ferroelectric, lattice dynamics