Dresden 2006 – wissenschaftliches Programm

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DF: Dielektrische Festkörper

DF 3: Poster Session

DF 3.23: Poster

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

Ultrasound Investigations of BaTi_1−xSn_xO₃ Ceramics — •Ulrich Straube¹, Ludwig Geske¹, Ralf Steinhausen¹, Hans Theo Langhammer¹, Horst Beige¹, and Hans-Peter Abicht² — ¹Martin-Luther-Universität Halle-Wittenberg, Fachbereich Physik, Friedemann-Bach-Platz 6, D-06108 Halle/Saale (Germany) — ²Martin-Luther-Universität Halle-Wittenberg, Fachbereich Chemie, Karl-Mothes-Str. 2, D-06120 Halle/Saale (Germany)

BaTi_1−xSn_xO₃ (BTS) ceramics can be interpreted as a system with more or less diffuse phase transition behaviour depending on the Sn content of the material. BTS belongs to the class of BaTiO₃ based environmental-friendly solid solutions, which possesses similar properties like the classical lead-containing relaxors and is becoming an interesting candidate for future applications. Its dielectric and electromechanical resonance properties were already reported in [1]. In the present study the elastic stiffness coefficients were determined by the ultrasound impulse overlap technique at a frequency of 5 MHz allowing the simultaneous determination of sound velocity and attenuation. Elastic properties in a broad temperature range with compositions of x ≤ 0.15 were obtained. The cubic-tetragonal and the tetragonal-orthorhombic phase transitions are accompanied by anomalies of the sound velocities and the ultrasound attenuation. Sound velocities show minima whereas attenuation increases strongly especially near the cubic-tetragonal transition. Effects of the acoustic dispersion of the elastic data of BTS are discussed.

[1] L. Geske, H. Beige, H.-P. Abicht, V. Mueller: Ferroelectrics vol. 314, 97, (2005)