Percolation of polar nanoregions: A dynamic approach to the ferroelectric phase transition

S. E. Lerner; P. Ben Ishai; A. J. Agranat; Y. Feldman

doi:10.1016/j.jnoncrysol.2007.02.075

Percolation of polar nanoregions: A dynamic approach to the ferroelectric phase transition

S. E. Lerner, P. Ben Ishai, A. J. Agranat, Y. Feldman

Research output: Contribution to journal › Article › peer-review

19 Scopus citations

Abstract

The percolative nature of the ferroelectric phase transition in a potassium tantalate niobate (KTN) crystal is studied using time domain dielectric spectroscopy. A relaxation process linked to the off-center niobium ions is observed. The dynamic nature of this relaxation shows well defined temperature regimes in which it progresses from independent (Arrhenius) to cooperative (Vogel-Fulcher-Tammann) behavior. A recursive fractal model was applied in order to interpret the data obtained from the dielectric measurements. The structural parameters, ν and μ, derived from the correlation functions, enable the investigation of the onset of the phase transition in terms of the fractal dimensions of the polarization excitation.

Original language	English
Pages (from-to)	4422-4427
Number of pages	6
Journal	Journal of Non-Crystalline Solids
Volume	353
Issue number	47-51
DOIs	https://doi.org/10.1016/j.jnoncrysol.2007.02.075
State	Published - 1 Dec 2007
Externally published	Yes

Keywords

Calorimetry
Dielectric properties, relaxation, electric modulus
Ferroelectric
Percolation

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10.1016/j.jnoncrysol.2007.02.075

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title = "Percolation of polar nanoregions: A dynamic approach to the ferroelectric phase transition",

abstract = "The percolative nature of the ferroelectric phase transition in a potassium tantalate niobate (KTN) crystal is studied using time domain dielectric spectroscopy. A relaxation process linked to the off-center niobium ions is observed. The dynamic nature of this relaxation shows well defined temperature regimes in which it progresses from independent (Arrhenius) to cooperative (Vogel-Fulcher-Tammann) behavior. A recursive fractal model was applied in order to interpret the data obtained from the dielectric measurements. The structural parameters, ν and μ, derived from the correlation functions, enable the investigation of the onset of the phase transition in terms of the fractal dimensions of the polarization excitation.",

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T2 - A dynamic approach to the ferroelectric phase transition

AU - Lerner, S. E.

AU - Ben Ishai, P.

AU - Agranat, A. J.

AU - Feldman, Y.

PY - 2007/12/1

Y1 - 2007/12/1

N2 - The percolative nature of the ferroelectric phase transition in a potassium tantalate niobate (KTN) crystal is studied using time domain dielectric spectroscopy. A relaxation process linked to the off-center niobium ions is observed. The dynamic nature of this relaxation shows well defined temperature regimes in which it progresses from independent (Arrhenius) to cooperative (Vogel-Fulcher-Tammann) behavior. A recursive fractal model was applied in order to interpret the data obtained from the dielectric measurements. The structural parameters, ν and μ, derived from the correlation functions, enable the investigation of the onset of the phase transition in terms of the fractal dimensions of the polarization excitation.

AB - The percolative nature of the ferroelectric phase transition in a potassium tantalate niobate (KTN) crystal is studied using time domain dielectric spectroscopy. A relaxation process linked to the off-center niobium ions is observed. The dynamic nature of this relaxation shows well defined temperature regimes in which it progresses from independent (Arrhenius) to cooperative (Vogel-Fulcher-Tammann) behavior. A recursive fractal model was applied in order to interpret the data obtained from the dielectric measurements. The structural parameters, ν and μ, derived from the correlation functions, enable the investigation of the onset of the phase transition in terms of the fractal dimensions of the polarization excitation.

KW - Calorimetry

KW - Dielectric properties, relaxation, electric modulus

KW - Ferroelectric

KW - Percolation

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Percolation of polar nanoregions: A dynamic approach to the ferroelectric phase transition

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