Ponente
Descripción
The physical properties have been investigated in (Bi0.5Na0.5)1–xBaxTiO3 ceramics, where x = 10, 12, 16 at% Ba (BNT–xBT), synthesized via the high-power ultrasound technique. For the production of the samples, several stages have been considered, by using an output power of 1kW with a frequency of 22 kHz for sonication. The stoichiometric mixtures of the starting chemicals, as well as the obtained powders after calcination, were sonicated in ethanol, in order to ensure better homogeneity of the chemical composition. High-power ultrasound has been also applied to a die set when pressing the powder into a compact to homogenize stress distribution in the pressed compact and thereby reduce appearance of cracks, as well as to improve quality of the surface layers. The structural, dielectric and piezoelectric behaviors have been analyzed, and compared with the same compositions obtained by the standard solid-state reaction method.
