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DF: Dielektrische Festkörper

DF 7: Dielectric and Ferroelectric Thin Films and Nanostructures II

DF 7.4: Vortrag

Mittwoch, 29. März 2006, 15:30–15:50, K{\"O}N Farb

Optical Characterization of Suspensions of Lithium Niobate Nanoparticles* — •Judith Schwesyg, Helge A. Eggert, and Karsten Buse — Institute of Physics, University of Bonn, Wegelerstr. 8, 53115 Bonn

Using suspensions of ferroelectric nanoparticles in liquids one can combine the outstanding properties of the nanoparticles with the characteristics of fluids. Stable suspensions of lithium niobate nanocrystals in liquids are produced in a high-energy ball-milling process. The size of the particles is of the order of 20–50 nm. We present the details of the methods for producing such stable suspensions and for investigating the characteristic parameters of these liquids. Furthermore, we present data of absorption and scattering experiments. In addition one can apply external electric fields to measure the field-induced birefringence of the suspensions. Alignment of the nanocrystals breaks the inversion symmetry and should enable frequency conversion processes in suspensions of ferroelectric nanoparticles.