Piezoelectric properties of SrBi_4O_15 ferroelectric ceramics

摘要

The dynamic piezoelectric response of SrBi_4O_15 ceramics with Aurivillius structure was investigated at high alternating stress, low frequencies(0.01 to 100 Hz), and temperatures from 20 to 200 deg. C. The piezoelectric nonlinearity, observed only at high pressures(> 10 MPa)and elevated temperatures(> 150 deg. C), is interpreted in terms of contributions from non-180°domain walls. At weak fields, the frequency dependence of the longitudinal piezoelectric coefficient was explained in term of Maxwell-Wagner piezoelectric relaxation.