High temperature piezoelectric performance of CaZrO3 modified BiScO3-PbTiO3 ceramics.

This paper has reported a novel ternary system consisting of (1- x - y) BiScO 3 - x PbTiO 3 - y CaZrO 3 (y CZ-BS- x PT). The phase structure, microstructure and electrical parameters of the new piezoelectric material at room temperature were studied in detail. The results showed that d 33 increased significantly with the increase of CZ content. Combined with the results of phase structure, the MPB of 0.02CZ-BS- x PT is located at x = 0.615, which demonstrates optimum piezoelectric performance (d 33 = 470 pC/N， k p = 52.0 %, ε r = 1704). At the same time, the in-situ high-temperature electrical parameters were characterized systematically. It is worth noting that the in-situ electrical parameters are more attractive. When the temperature rises from room temperature to 300 °C, the k t and k p of 0.02CZ-BS-0.615 PT decreases by less than 7 % and the k p reaches the maximum of 60.7 % at 200 °C, and remains 49.8 % even at 300 °C. In addition, the in-situ d 33 test of 0.005CZ-BS-0.63 PT showed that the d 33 of the material increased from room temperature to 424 °C, reaching a maximum of 690 pC/N. From room temperature to 300 °C, the change rate is only 26 %, lower than that of the undoped BS-PT, which is 38.6 %. And the d 33 * reaches a maximum of 994 p.m./V at 200 °C. The improved in-situ piezoelectric properties of y CZ-BS- x PT ternary system makes it a great candidate for high temperature piezoelectric applications. [ABSTRACT FROM AUTHOR]