Macroscopic response and directional disorder dynamics in chemically substituted ferroelectrics.

Citation:

Jacopo Parravicini, Eugenio DelRe, Aharon J Agranat, and Gianbattista Parravicini. 2016. “Macroscopic response and directional disorder dynamics in chemically substituted ferroelectrics..” Physical Review B: Condensed Matter & Materials Physics, 93, 9, Pp. 1 - 1.

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. [ABSTRACT FROM AUTHOR]Copyright of Physical Review B: Condensed Matter & Materials Physics is the property of American Physical Society and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Notes:

Accession Number: 117488397; Parravicini, Jacopo 1,2; Email Address: jacopo.parravicini@roma1.infn.it DelRe, Eugenio 1 Agranat, Aharon J. 3 Parravicini, Gianbattista 4,5; Affiliation: 1: Dipartimento di Fisica, "Sapienza" Università di Roma, 00185 Roma, Italy 2: Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca, 20125 Milano, Italy 3: Applied Physics Department, Hebrew University of Jerusalem, 91904, Israel 4: Dipartmento di Fisica, Università di Pavia, 27100 Pavia, Ita 5: IPCF-CNR, "Sapienza" Università di Roma, 00185 Roma, Italy; Source Info: Mar2016, Vol. 93 Issue 9, p1; Subject Term: PHYSICS periodicals; Subject Term: FERROELECTRIC crystals; Subject Term: BROKEN symmetry (Physics); Subject Term: LATTICE models (Statistical physics); Subject Term: FERROELECTRIC materials; People: PARRAVICINI, Jacopo; People: DELRE, Eugenio; People: AGRANAT, Aharon J.; People: PARRAVICINI, Gianbattista; Number of Pages: 1p; Document Type: Article