Dresden 2006 – scientific programme

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DF: Dielektrische Festkörper

DF 9: Phase Transitions

DF 9.5: Talk

Thursday, March 30, 2006, 11:30–11:50, M{\"U}L Elch

Investigation of the relaxor system Strontium-Barium-Niobate by Second Harmonic Generation — •Uwe Voelker, Klaus Betzler, and Sergey Podlozhenov — Universität Osnabrück, Fachbereich Physik, Barbarastraße 7, D - 49069 Osnabrück, Germany

The relaxor phase transition in ferroelectrics is still not completely understood. In contrast to past investigations, we use second harmonic generation (SHG) as a tool to observe the behavior of the bulk of Sr_0.61Ba_0.39Nb₂O₆(SBN). Thus we are able to watch closely how particular classes of domains lose their spontaneous polarisation while passing through the phase transition without integrating over the whole crystal. We will present the concentration-dependence of the relaxor phase transition of SBN doped with rare earth-metals obtained by these measurements. Supported by DFG (project GRK 695).