Dresden 2003 – wissenschaftliches Programm
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DF: Dielektrische Festkörper
DF 7: Poster
DF 7.18: Poster
Mittwoch, 26. März 2003, 14:30–18:00, P2a
Preparation and Characterisation of PbTiO3 nanopowders from combined polymerisation and pyrolysis route — •Emre Erdem1, Rolf Boettcher1, Hans-Christoph Semmelhack1, Hans-Juergen Glaesel2, Eberhard Hartmann2, and Dietmar Hirsch2 — 1Institut fuer Experimentelle Physik II, Universitaet Leipzig, D-04103 Leipzig, Germany — 2Institut fuer Oberflaechenmodifizierung, D-04318 Leipzig, Germany
Lead titanate (PbTiO3) nanopowders were prepared from a monomeric metallo-organic precursor through combined solid-state polymerisation and pyrolysis (CPP). It enables the adjustment of the mean particle size in a wide range by just choosing appropriate reaction temperature. This particular preparation route was studied by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The size effects in the resulting PbTiO3 nanopowders were investigated by standard methods such as X-ray diffraction (XRD) and FT-Raman spectroscopy. By using the double Voigt method in analysing the XRD results, smaller mean particle size and narrower size distributions were found for powders prepared at lower reaction temperatures, with the tetragonality being reduced. Preliminary electron paramagnetic resonance (EPR) measurements demonstrate that paramagnetic chromium probe ions incorporate very well into the PbTiO3 lattice, particularly enabling corresponding high field EPR measurements. Moreover, the potential of the CPP route is enhanced to prepare perovskitic stoichiometric solutions for advanced practical applications.