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Liquid-solid directional composites and anisotropic dipolar phases of polar nanoregions in disordered perovskite

Abstract

Using temperature-resolved dielectric spectroscopy in the range 75-320 K we inspect 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 a nominally pure perovskites. Moreover, experimental demonstration of the onset of a frozen state above transitions is provided.

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Publication details

The article was received on 21 Dec 2016, accepted on 03 Jun 2017 and first published on 05 Jun 2017


Article type: Paper
DOI: 10.1039/C6NR09817G
Citation: Nanoscale, 2017, Accepted Manuscript
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    Liquid-solid directional composites and anisotropic dipolar phases of polar nanoregions in disordered perovskite

    J. Parravicini, E. Del Re, A. J. Agranat and G. Parravicini, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C6NR09817G

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