Study the Effect of Temperature and Frequency on Core Shell Degradation Behavior of Ceramic Composite

Abstract

Over the past few decades, most piezoelectric ceramic devices such as filter, actuators, sensors and so on, have been designed from lead-based piezoelectric ceramic materials, such as PZT, because of their excellent piezoelectric properties. But due to environmentally harmful effect of Pb, there is need to synthesize the lead-free ceramic having good properties as compared to PZT. Therefore, lead free ceramic and composite play an important role in environmentally friendly materials. In this study, frequency dependent properties of Bi1/2 Na1/2 TiO3 – SrTiO3 composite were studied. It is shown that the 24ST composite with (ST10) is a relaxor ferroelectric as shown by the frequency dependent dielectric properties with an piezoelectric featured with the presence of a reversible electric field induced phase transformation at room temperature. It is also accompanied by a huge strain that is ascribed to matrix and seed effect originating due to inhomogeneous composition. The 24ST composite makes an attractive lead free candidate as it presents a high normalized d33 * of 980 pm/V at a low electric field of 2.5 kV/mm for frequencies ranging from 0.1 up to 200 Hz. In the past, innovations in actuators and ultrasonic transducers have been the driving force for new developments in piezoelectric ceramics. Currently the main objective is to reduce the triggering field and demolition with frequency for the application of actuators.

Over the past few decades, most piezoelectric ceramic devices such as filter, actuators, sensors and so on, have been designed from lead-based piezoelectric ceramic materials, such as PZT, because of their excellent piezoelectric properties. But due to environmentally harmful effect of Pb, there is need to synthesize the lead-free ceramic having good properties as compared to PZT. Therefore, lead free ceramic and composite play an important role in environmentally friendly materials. In this study, frequency dependent properties of Bi1/2 Na1/2 TiO3 – SrTiO3 composite were studied. It is shown that the 24ST composite with (ST10) is a relaxor ferroelectric as shown by the frequency dependent dielectric properties with an piezoelectric featured with the presence of a reversible electric field induced phase transformation at room temperature. It is also accompanied by a huge strain that is ascribed to matrix and seed effect originating due to inhomogeneous composition. The 24ST composite makes an attractive lead free candidate as it presents a high normalized d33 * of 980 pm/V at a low electric field of 2.5 kV/mm for frequencies ranging from 0.1 up to 200 Hz. In the past, innovations in actuators and ultrasonic transducers have been the driving force for new developments in piezoelectric ceramics. Currently the main objective is to reduce the triggering field and demolition with frequency for the application of actuators.