• MAGDALENA GROMADA

      Articles written in Bulletin of Materials Science

    • Processing and characterization of screen printing Ba$_{0.5}$Sr$_{0.5}$Co$_{0.8}$Fe$_{0.2}$O$_{3−\delta}$ inks

      MAGDALENA GROMADA DAVIDE GARDINI PIETRO GALIZIA CARMEN GALASSI

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      Oxygen-selective membranes based on thin layers of barium–strontium–cobalt ferrite Ba$_{0.5}Sr$_{0.5}$Co$_{0.8}$Fe$_{0.2}O$_{3−\delta}$ (BSCF) perovskite oxide were manufactured. Five BSCF inks prepared with differentcarriers and milling treatments were rheologically characterized, screen printed on three different porous alumina substrates and sintered at 1050 and 1150$^{\circ}$C. The resulting membranes were characterized. The data collected on the rheological properties of inks (flow curves, thixotropic behaviour, linear viscoelasticity), their processability by screen printing, and the quality of the layers obtained after sintering represents an important starting point to set up the next research activities.

    • Characterization of BaTiO$_3$ piezoelectric perovskite material for multilayer actuators

      MAGDALENA GROMADA MOJTABA BIGLAR TOMASZ TRZEPIECINSKI FELIKS STACHOWICZ

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      In this study, we present the results of the manufacturing of BaTiO$_3$ powder, which is meant for use in stacked-diskmultilayer actuator production. The solid-state technique was used for powder preparation. The properties of bariumtitanate material, at each stage of its fabrication (powder, granulate, sintered material), influencing on its application forthe stacked-disk multilayer actuator were determined. Particularly, the four parameters of BaTiO$_3$ sinter affecting on theusability properties of actuators, not found before in the literature, were estimated. Parameters characterizing the extent ofmaterial sintering, SEM microstructures and electric properties of the fabricated pellets are presented and discussed. Thedilatometric curve was executed using the high temperature dilatometer to determine at which temperature barium titanatepellets and beams should be sintered to receive full dense sinters. Parameters characterizing the extent of material sintering:the apparent density, the apparent porosity and the water absorbability were estimated. Finally, the problem of metal layerdeposition on barium titanate ceramics during actuator fabrication is considered.

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