Abstract
Neutron and x-ray scattering studies on relaxor ferroelectric systems Pb(Zn 1/3 Nb 2/3 )O 3 (PZN), Pb(Mg 1/3 Nb 2/3 )O 3 (PMN), and their solid solutions with PbTiO 3 (PT) have shown that inhomogeneities and disorder play important roles in the materials properties. Although a long-range polar order can be established at low temperature – sometimes with the help of an external electric field; short-range local structures called the “polar nano-regions” (PNR) still persist. Both the bulk structure and the PNR have been studied in details. The coexistence and competition of long- and short-range polar orders and how they affect the structural and dynamical properties of relaxor materials are discussed.
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