Berlin 2005 – scientific programme
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DF: Dielektrische Festkörper
DF 6: Dielektrische und ferroelektrische dünne Schichten und Nanostrukturen II
DF 6.3: Talk
Monday, March 7, 2005, 14:40–15:00, TU TC6
Size effects in chromium doped PbTiO 3 nanopowders — •Emre Erdem1, Rolf Böttcher1, Anke Weller2, H.-Jürgen Gläsel2, Eberhard Hartmann2, and Juras Banys3 — 1Institute of Experimental Physics II, University of Leipzig, Linnestr. 5, D-04103, Leipzig Germany — 2Leibniz-Institute of Surface Modification, Permoserstr. 15, D-04318, Leipzig Germany — 3Radiophysics Department, Faculty of Physics, Vilnius University, LT-10222 Vilnius, Lithuania
Lead titanate (PbTiO 3 ) nanopowders with mean particle sizes down to 10 nm were prepared from a metal-organic precursor through combined polymerisation and pyrolysis (CPP). Further reduction in particle diameter was achieved by soft milling. In delineating the structural changes which occur in correlation with size effects and size driven phase transition in PbTiO 3 , dielectric (1 GHz - 1 MHz) and multi-frequency (9.5, 34.0 and 94.5 GHz) EPR measurements were carried out on chromium doped micro- and nanopowders. The size-dependent multi-frequency EPR spectra are discussed, the spin Hamiltonian parameters are determined and correlated with structural investigations and dielectric measurements.