Regensburg 2010 – scientific programme
Parts | Days | Selection | Search | Downloads | Help
DF: Fachverband Dielektrische Festkörper
DF 3: Poster I: Nano- and microstructured dielectrics, surfaces and interfaces, dielectric composites
DF 3.1: Poster
Monday, March 22, 2010, 15:00–17:30, Poster D1
Lithium niobate nanoparticles: Orientation in externally applied electric fields* — •Bastian Knabe, Daniel Schütze, and Karsten Buse — Universität Bonn, Wegelerstr. 8, 53115 Bonn
The spontaneous polarization in lithium niobate leads to charged c-faces. It turns out that these surface charges of lithium niobate nanoparticles are not fully compensated. This leads to a remaining electrical dipole moment. We synthesize lithium niobate nanoparticles with a sol-gel method and measure their orientation in externally applied electric fields using this effect. By introducing dopants of different concentration and changing ambient conditions such as temperature, we investigate the various dependences of the dipole moment, which is generally about 10−3 of the dipole moment present for the uncompensated spontaneous polarization.
* Financial support by the Deutsche Forschungsgemeinschaft and the Deutsche Telekom AG is gratefully acknowledged.