Pronounced nonlinear enhancements in dielectric responses and decreases in phase transformation temperatures were induced under moderate ac fields and high field cycling for La modified lead zirconate titanate (PZT) ceramics. Polarization disordering could be inhibited by introducing acceptor dopants into La modified PZT compositions and by DC bias field. Analysis of the frequency dispersion revealed that the field driven transformation in lower La content PZT is a field assisted activation process, while the transformation in higher La content PZT relaxors is intrinsically a thermal activated process.
|Number of pages||6|
|Journal||Materials Research Society Symposium - Proceedings|
|State||Published - 1998|
|Event||Proceedings of the 1997 MRS Fall Symposium - Boston, MA, USA|
Duration: 2 Dec 1997 → 5 Dec 1997