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Berlin 2005 – scientific programme

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DF: Dielektrische Festkörper

DF 5: Dielektrische und ferroelektrische dünne Schichten und Nanostrukturen I

DF 5.2: Talk

Monday, March 7, 2005, 10:40–11:00, TU TC6

Structure of nanocrystalline BaTiO(3)-films prepared at different temperatures. — •Kesav Reddy1, Dieter Mergel1, Stefan Reuter1, Volker Buck1 und Martin Sulkowski21AG Dünnschicht-Technologie, Universität Duisburg-Essen, 45117 Essen — 2Institut für Umwelt-Analytik, Universität Duisburg-Essen

BaTiO(3) films were prepared by rf magnetron sputtering at substrate temperatures between 450C and 750C and analyzed by means of XRD, optical transmittance and Raman spectroscopy.

The films prepared at 450C exhibit a distinct close-range order but no higher-order XRD reflexes. The films prepared below or above 650C grow preferentially in (100)- or (110)-direction, respectively. The position of the XRD-reflexes is closest to those of the hexagonal phase. Raman spectra exhibit peaks of both the hexagonal and cubic structure.

These results are discussed on the basis of a structural model of nanocrystallites comprising the stacking of close-packed planes (111 in the cubic structure) with a high degree of twinning.

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