Diffuse Scattering and Local Order in PMN-xPT
Abstract: Relaxor ferroelectrics possess intriguing electromechanical and dielectric properties, and while the physics underneath these properties remain unresolved, they are thought to be related to locally correlated atomic displacements from long-range symmetry. Single-crystal diffuse scattering provides a powerful tool to investigate such deviations from average structure, and developments in instrumentation and techniques using both X-rays and neutrons have allowed such measurements to be made much more efficiently than previously feasible.
Employing such measurements on the canonical relaxor system PMN-xPT over a range of concentrations and temperatures shows a rich array of different forms of short-range correlations. By tracking these different forms across the phase diagram and using the contrast between X-ray and neutron scattering data, it is possible to connect them to the various bulk properties displayed by PMN-xPT, offering valuable insight into the microscopic origins of its intriguing properties.