|About this Abstract
||Materials Science & Technology 2012
||Advances in Dielectric Materials and Electronic Devices
||Temperature Dependence of Ultrasonic Velocity in Lead Zirconate Titanate Ceramics
||Pin Yang, Tony Liu
|On-Site Speaker (Planned)
Ultrasonic velocity for unpoled and poled lead zirconate titanate ceramics were measured by a pulse-echo/through transmission buffer rod technique from sub-ambient to above their Curie temperatures. The elastic moduli were determined from elastic constants that were calculated from acoustic velocities, assuming a transverse isotropic and a cylindrical symmetry for unpoled and poled samples respectively. Results indicated that both longitudinal and shear velocities changed significantly near phase transformation temperatures. In addition all the elastic moduli, including Young’s modulus, shear modulus and bulk modulus reached a local minimum at the phase transformation temperatures with a global minimum at their Curie temperatures. These observations are consistent with the development of a soft phonon mode in the ferroelectric lattice as temperature approaches the phase transformations. These phenomena have important implications to piezoelectric performance in ferroelectric ceramics.