Analysis of vibration characteristics of piezocomposite based on PMN-PT

In this article, the characteristics of 1-3 piezocomposites based on PMN-PT relaxor single crystals with different percentages of PT were investigated. For this purpose, parameters of electromechanical coupling coefficient, longitudinal velocity and acoustic characteristic impedance were calculated and analyzed with the help of effective parameters model. It was observed that the change of PT percentage has a significant effect on the mentioned quantities. For example, by changing the percentage of PT, the electromechanical coupling coefficient can be increased to more than 90%. In addition, by using the appropriate amount of volume fraction of single crystals, it is possible to greatly reduce the longitudinal velocity, and therefore the characteristic acoustic impedance, as shown by using PMN-0.33PT single crystal in volume fraction. 0.4, a longitudinal velocity of 3300 m/s and an acoustic characteristic impedance of 1.3 MRayl can be achieved, while the coupling coefficient is close to 90%. According to the obtained results, it was seen that the changes in the functional parameters of 1-3 piezocomposite based on PMN-PT single crystals were not linear in relation to the percentage of PT, and necessarily with the decrease or increase in the percentage of PT, the values of electromechanical coupling coefficient, longitudinal velocity and the characteristic acoustic impedance does not decrease or increase, and the optimal point should be found by examining different percentages of PT according to the desired application.