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.

Parravicini, J., Delre, E., Agranat, A., Parravicini, G. (2016). Macroscopic response and directional disorder dynamics in chemically substituted ferroelectrics. PHYSICAL REVIEW. B, 93(9) [10.1103/PhysRevB.93.094203].

Macroscopic response and directional disorder dynamics in chemically substituted ferroelectrics

Parravicini, Jacopo
Primo
;
2016

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.
Articolo in rivista - Articolo scientifico
Condensed Matter Physics; Electronic, Optical and Magnetic Materials
English
2016
93
9
094203
open
Parravicini, J., Delre, E., Agranat, A., Parravicini, G. (2016). Macroscopic response and directional disorder dynamics in chemically substituted ferroelectrics. PHYSICAL REVIEW. B, 93(9) [10.1103/PhysRevB.93.094203].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/122529
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