High temperature acoustic effects in relaxors PbMg1/3Nb2/3O3 and PbFe1/2Nb1/2O3

摘要

The longitudinal acoustic wave velocity and attenuation in PbFe1/2Nb1/2O3 and PbMg1/3Nb2/3O3 ceramics have been measured by pulse-echo technique at a frequency of 10 MHz in the temperature range from 200 to 700 K. The anomalies observed in the sound velocity and attenuation behavior versus temperature are correlated with temperature range of relaxor ferroelectric state (PbFe1/2Nb1/2O3) and Burns temperatures.