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DF: Dielektrische Festkörper

DF 3: Poster Session

DF 3.24: Poster

Monday, March 27, 2006, 09:30–17:00, P1

Growth, structural, electrical and optical properties of complex perovskite-type Pb0.78Ba0.22Sc0.5Ta0.5O3 single crystals — •Vera Marinova1, Boriana Mihailova1, Dimitrina Petrova2, Thomas Malcherek1, and Ulrich Bismayer11Universität Hamburg, Mineralogisch-Petrographisches Institut, Grindelallee 48, D-20146 Hamburg — 2South-West University Neofit Rilski, 2700 Blagoevgrad, Bulgaria

Pb0.78Ba0.22Sc0.5Ta0.5O3 (PBST) single crystals are prepared by the High Temperature Solution Growth (HTSG) method using a flux solution with composition PbO : PbF0.2 : B2O3 = 0.75 : 0.23 : 0.2. The growth conditions for a solid-state phase synthesis were established. The growing process was performed in platinum crucibles in temperature range 1430-1193 K with cooling velocity of 0.5 deg/h. The obtained crystals are cubic-shaped with approximately 1 cm3 of size. X-ray diffraction data revealed a doubled perovskite-type structure for this newly synthesized compound. The PBST sample was analysed by electrical, optical, and inelastic light scattering measurements. The phase transition was studied by dielectric measurements in the temperature interval from 77 K to 400 K.

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