A comparative study of the influence of both mobile and randomly quenched impurities and their associated defect complexes on ferroelectric phase transformations in lead zirconate titanate ceramics has been performed by dielectric spectroscopy and transmission electron microscopy. These investigations have shown a strong dependence of the structure-property relations on the mobility of impurities and/or defect complexes in the temperature range near and below the phase transformation. Impurities-defects which are mobile until temperatures below the transformation are believed to preferentially locate near domain boundaries, resulting in polarization pinning. For these compositions, no evidence of relaxor ferroelectric behavior was observed. However, for the compositions whose impurities-defects were essentially immobile from temperatures above the ferroelectric phase transformation, relaxor behavior and polar nanodomains were found. Studies of the influence of electrical and thermal histories on properties provided additional insights into the influence of impurity-defect mobility.
|Number of pages||17|
|Issue number||1 -4; 1-2|
|State||Published - 1998|
|Event||Proceedings of the 1997 Williamsburg Workshop on Ferroelectrics - Williamsburg, VA, USA|
Duration: 2 Feb 1997 → 5 Feb 1997