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Dresden 2009 – scientific programme

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DF: Fachverband Dielektrische Festkörper

DF 6: Poster I

DF 6.8: Poster

Tuesday, March 24, 2009, 09:30–12:30, P5

Structure and Physical Properties of A2/3Cu3Ti4O12 (A = Rare Earth) — •Stefan Riegg1, Jürgen Sebald3, Stephan Krohns3, Stefan G. Ebbinghaus2, Peter Lunkenheimer3, Alois Loidl3, and Armin Reller11Solid State Chemistry, Institute for Physics, University of Augsburg, 86135 Augsburg, Germany — 2Solid State Chemistry, Institute for Chemistry, Martin-Luther University Halle-Wittenberg, 06120 Halle, Germany — 3Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, 86135 Augsburg, Germany

Many materials based on the ACu3Ti4O12 structure-type provide very high dielectric constant ε′, like the most famous member A = Ca with a value of greater than 103. These materials with so called "collossal dielectric constants" (CDC) are very useful for technical application and thus of special scientific interest. Structurally related systems with lanthanide ions on the A position can be used to study the CDC mechanism. Due to the +3 (Ce: +4) valence of the rare earth ions, in comparison to the +2 valence of Ca, only two thirds (Ce: half) of the A position are occupied in the crystal. Samples with A = Y3+, La3+, Ce4+, Pr3+, Nd3+, Sm3+ to Yb3+ were prepared by solid state reaction of the binary oxides. X-ray diffraction in combination with Rietveld analysis was used to investigate the structure. The measured dielectric properties show the CDC behaviour of this material. In addition the band gap energy was determined by UV-Vis spectroscopy. Measurements of the magnetic susceptibility were carried out to study the magnetic behaviour.

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