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Dresden 2006 – scientific programme

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DF: Dielektrische Festkörper

DF 3: Poster Session

DF 3.12: Poster

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

Phase and microstructure evolution during BaTiO3 formation by solid state reactions on rutile single crystals — •Andriy Lotnyk, Stephan Senz, and Dietrich Hesse — Max Planck Institute of Microstructure Physics, Weinberg 2, 06120 Halle, Germany

During the synthesis of BaTiO3 ceramics out of a stoichiometric BaCO3-TiO2 mixture the evolution of different intermediate phases can generally be observed. These intermediate products are Ba2TiO4 and Ti-rich phases. Using micro chemically designed core shell powders the sequence of forming phases changes. To understand this behavior model experiments are performed using rutile (TiO2) single crystals. The solid state reactions of TiO2 with BaCO3 (solid and vapour, respectively) are studied. A BaCO3 target was electron beam evaporated in a high vacuum system with PO2=1×10−2 Pa. The substrates were heated in a tube furnace at T=300-500C during deposition, followed by a solid-solid reaction at 575-1100C in vacuum or in air; for the gas-solid reaction, the substrates were heated at T=575-1100C directly during deposition. The reaction products were investigated by XRD and TEM. The solid-solid reaction at 600C for 30 min under vacuum produced the metastable intermediate Ba2TiO4 phase while the reaction in air resulted in the formation of BaTiO3. Well-oriented products are formed on (110), (100), (101) TiO2 and polycrystalline phases were identified on (001) TiO2.

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