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DF: Dielektrische Festkörper

DF 3: Poster Session

DF 3.24: Poster

Montag, 27. März 2006, 09:30–17:00, P1

Growth, structural, electrical and optical properties of complex perovskite-type Pb_0.78Ba_0.22Sc_0.5Ta_0.5O₃ single crystals — •Vera Marinova¹, Boriana Mihailova¹, Dimitrina Petrova², Thomas Malcherek¹, and Ulrich Bismayer¹ — ¹Universität Hamburg, Mineralogisch-Petrographisches Institut, Grindelallee 48, D-20146 Hamburg — ²South-West University Neofit Rilski, 2700 Blagoevgrad, Bulgaria

Pb_0.78Ba_0.22Sc_0.5Ta_0.5O₃ (PBST) single crystals are prepared by the High Temperature Solution Growth (HTSG) method using a flux solution with composition PbO : PbF_0.2 : 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.