Title :
Incommensuration in “dirty” antiferroelectrics
Author :
Xu, Z. ; Dai, Xunhu ; Viehland, Dwight
Author_Institution :
Dept. of Mater. Sci. & Eng., Illinois Univ., Urbana, IL, USA
Abstract :
Antiferroelectric lanthanum-modified lead zirconate titanate (PLZT) specimens with a La-content of 2 at.% and a Zr/Ti ratio of 95/5 (PLZT 2/95/5) have been investigated by dielectric spectroscopy, Sawyer-Tower polarization (P-E) measurements, and hot-stage transmission electron microscopy (TEM). La “impurities” have been found to induce a 1/x[110] incommensurate structure from the commensurate antiferroelectric orthorhombic (AFE0) PbZrO3 (PZ) structure. The incommensurate structure was found to be stable below the temperature of the dielectric maximum, evolving slowly with decreasing temperature towards the commensurate AFE0 PZ structure. The incommensuration is believed to arise due to a competition between “broken” dipolar (ferroelectric) and sublattice (antiferroelectric) interactions
Keywords :
antiferroelectric materials; commensurate-incommensurate transformations; dielectric polarisation; ferroelectric materials; ferroelectric transitions; lanthanum compounds; lead compounds; piezoceramics; transmission electron microscopy; La-content; PLZT; PbLaZrO3TiO3; Sawyer-Tower polarization; TEM; Zr/Ti ratio; antiferroelectric lanthanum-modified lead zirconate titanate; broken dipolar ferroelectric interactions; commensurate antiferroelectric orthorhombic structure; dielectric maximum; dielectric spectroscopy; dirty antiferroelectrics; hot-stage transmission electron microscopy; impurities; incommensurate structure; incommensuration; sublattice antiferroelectric interactions; Dielectric measurements; Electrochemical impedance spectroscopy; Electron beams; Ferroelectric materials; Hysteresis; Image resolution; Lattices; Optical reflection; Stability; Temperature distribution;
Conference_Titel :
Applications of Ferroelectrics, 1994.ISAF '94., Proceedings of the Ninth IEEE International Symposium on
Conference_Location :
University Park, PA
Print_ISBN :
0-7803-1847-1
DOI :
10.1109/ISAF.1994.522377
