Regensburg 2007 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 3: Relaxor Ferroelectrics
DF 3.4: Vortrag
Montag, 26. März 2007, 15:50–16:10, H11
Crystal structure of the relaxor ferroelectric PbSc0.5Ta0.5O3 from 300 K to 20 K — •Bernd Maier1, Jörg Ihringer1, Boriana Mihailova2, and Ulrich Bismayer2 — 1Institut für Angewandte Physik, auf der Morgenstelle 10, 72076 Tübingen — 2Mineralogisch-Petrographisches Institut, Universität Hamburg, Grindelallee 48, 20146 Hamburg
High resolution X-ray powder data of PbSc0.5Ta0.5O3 (PST) collected an 20<T<300 K with a modified image plate Camera (Huber) in Guinier geometry exhibits diffuse phase transitions from the cubic (Pm3m) paraelectric state to the rhombohedral ferroelectric state. Small domains of Sc/Ta-ordering lead to an doubled unit cell (Fm3m) which gives weak and broad reflections. Also, the thermal dependence of lattice constants will be given.
Changes in behaviour due to Ba doping at the Pb sites and Ru doping at the Sc/Ta sites will be discussed.