Macroscopic response and directional disorder dynamics in chemically substituted ferroelectrics

Jacopo Parravicini*, Eugenio Delre, Aharon J. Agranat, Gianbattista Parravicini

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

Using temperature-resolved dielectric spectroscopy in the range 25-320 K we investigate the macroscopic response, phase symmetry, and order/disorder states in bulk ferroelectric K1-yLiyTa1-xNbx (KLTN). Four long-range symmetry phases are identified with their relative transitions. Directional analysis of the order/disorder states using Fröhlich entropy indicates global symmetry breaking along the growth axis and an anisotropic dipolar effective thermodynamic behavior, which ranges from disordered to ordered at the same temperature for different directions in the sample. Results indicate that the macroscopic polarization, driven by nanosized polar regions, follows a microscopic perovskite eight-sites lattice model.

Original languageAmerican English
Article number094203
JournalPhysical Review B
Volume93
Issue number9
DOIs
StatePublished - 21 Mar 2016

Bibliographical note

Publisher Copyright:
© 2016 American Physical Society.

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