Using temperature-resolved dielectric spectroscopy in the range of 75-320 K we have inspected the solid-like and liquid-like arrangements of nanometric dipoles (polar nanoregions) embedded in sodium-enriched potassium-tantalate-niobate (KNTN), a chemically-substituted complex perovskite crystal hosting inherent substitutional disorder. The study of order versus direction is carried out using Fröhlich entropy measurements and indicates the presence of four long-range symmetry phases, two of which are found to display profoundly anisotropic features. Exotic phases are found for which the dipoles at one fixed temperature manifest a liquid reorientational response along one crystal axis and a solid-like behavior along another axis. The macroscopic anisotropy observed in the sequence of different phases is found to match a microscopic order-disorder sequence typical of nominally pure perovskites. Moreover, experimental demonstration of the onset of a frozen state above transitions is provided.
Parravicini, J., DelRe, E., Agranat, A., & Parravicini, G. (2017). Liquid-solid directional composites and anisotropic dipolar phases of polar nanoregions in disordered perovskites. NANOSCALE, 9(27), 9572-9580.
Citazione: | Parravicini, J., DelRe, E., Agranat, A., & Parravicini, G. (2017). Liquid-solid directional composites and anisotropic dipolar phases of polar nanoregions in disordered perovskites. NANOSCALE, 9(27), 9572-9580. |
Tipo: | Articolo in rivista - Articolo scientifico |
Carattere della pubblicazione: | Scientifica |
Presenza di un coautore afferente ad Istituzioni straniere: | Si |
Titolo: | Liquid-solid directional composites and anisotropic dipolar phases of polar nanoregions in disordered perovskites |
Autori: | Parravicini, J; DelRe, E; Agranat, A; Parravicini, G |
Autori: | |
Data di pubblicazione: | 2017 |
Lingua: | English |
Rivista: | NANOSCALE |
Digital Object Identifier (DOI): | http://dx.doi.org/10.1039/c6nr09817g |
Appare nelle tipologie: | 01 - Articolo su rivista |
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