Regensburg 2010 – scientific programme

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DF: Fachverband Dielektrische Festkörper

DF 17: Nano- and microstructured dielectrics

DF 17.2: Talk

Thursday, March 25, 2010, 15:50–16:10, H11

Surface-charge effects of nanocrystalline lithium niobate* — •Daniel Schütze, Bastian Knabe, and Karsten Buse — Universität Bonn, Wegelerstr. 8, 53115 Bonn

As a ferroelectric material, lithium niobate exhibits a spontaneous polarization, which leads to charged c-faces. In the most simple picture, these charges can be fully compensated by various compensation mechanisms. Yet, investigations of surface charges show that this compensation is incomplete. Remaining surface charges lead to a finite dipole moment of lithium niobate nanoparticles. We analyze this dipole moment and its dependence on dopants and dopant concentration by measuring the orientation of nanoparticles in liquids upon application of electric fields.

* Financial support by the Deutsche Forschungsgemeinschaft and the Deutsche Telekom AG is gratefully acknowledged.