Redistribution of Random Nanoregions in Polarized Relaxor Ferroelectrics

• Published in: Ferroelectrics Vol. 369; no. 1; pp. 179 - 184
• Main Authors: Marqués, M. I., Aragó, C., Barranco, A. Peláiz, Zaldívar, O. Garcia, Piñar, F. Calderón, Lopez-Noda, R.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: London Taylor & Francis Group 01.01.2008; Taylor and Francis
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Dielectric properties of solids and liquids; Dielectric, piezoelectric, ferroelectric and antiferroelectric materials; Dielectrics, piezoelectrics, and ferroelectrics and their properties; Exact sciences and technology; nanoregions; Niobates, titanates, tantalates, pzt ceramics, etc; Permittivity (dielectric function); Physics; polarization; Relaxor; Random field; Frequency dependence; PLZT; nanoregions; Temperature effects; Electric field effects; Poling; polarization; Nanostructures; Relaxor; Permittivity
• ISSN: 0015-0193; 1563-5112
• DOI: 10.1080/00150190802378007

The dielectric permittivity in Pb 0.85 La 0.10 Zr 0.6 Ti 0.4 O 3 (PLZT 10/60/40) relaxor ferroelectrics is studied for different degrees of poling. We find that the half width of the dielectric permittivity and the transition temperature dependence on frequency becomes smaller by increasing the degree of poling. In order to explain such behavior we consider a model, previously used to study uniaxial relaxor ferroelectrics, where the nanoregions inside the sample are redistributed by applying an external electric field. The redistribution consists in a decrease on the dispersion of the random fields affecting to each nanoregion. This decrease on the dispersion decimates both, the broadening of the dielectric peak and the dependence with frequency of the transition temperature.