Piezoelectric studies of epoxy/BiFeO3 composites

Piezoelectric response of epoxy/BFO composites was determined by mounting sample on a plexiglass plate and the pneumatic air gun Zoraki HP-01-2, equipped with a compressed air container, was mounted over a vertical lever with distance of 5 mm to the top of the sample. Depending on the number of pumps, it allows to compress of various air amounts inside and thus changing the airflow pressure. For air stream pressure tests, three pumps were taken, resulting in air pressure of 17.03 bars. The sample was connected to the input of Keysight DSOX 3104T oscilloscope with an impedance of 1 MΩ, which allows for measurement of the output voltage of the sample. Keysight DSOX 3104T oscilloscope was connected to a PC with dedicated software installed. Finger tapping tests were also performed using plexiglass plate and Keysight DSOX 3104T oscilloscope, while for vibration response analysis Dynalabs DYN-PM-20 permanent magnet shaker with different accelerations and oscilloscope were used.