Complex domain structure in polycrystalline Pb(Sc0.5Nb0.5)O3

This letter provides evidence of ferroelectric domains existing in polycrystalline B-site cation disordered Pb(Sc0.5Nb0.5)O-3. A complex domain structure with variations in characteristic length and morphology is observed below the relaxor-ferroelectric phase transition at similar to 98 degrees C. At room temperature the micrometer-sized wedge-like, lamellar-like and irregularly shaped domains are found. By approaching the relaxor-ferroelectric phase transition temperature, the domain structure changes; the fraction of micrometer-sized domains is progressively decreasing. Approximately 100 nm large domains, which form mottled patterns, are observed, and associated with polar nano domains as described in other relaxor materials.