Glass-forming liquid kinetics manifested in a KTN: Cu crystal

P. Ben Ishai; C. E.M. De Oliveira; Y. Ryabov; Yu Feldman; A. J. Agranat

doi:10.1103/PhysRevB.70.132104

Glass-forming liquid kinetics manifested in a KTN: Cu crystal

P. Ben Ishai^*, C. E.M. De Oliveira, Y. Ryabov, Yu Feldman, A. J. Agranat

^*Corresponding author for this work

Department of Applied Physics

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

49 Scopus citations

Abstract

The relaxation processes in pure and copper-doped potassium tantalate niobate (KTN) were investigated by dielectric spectroscopy over a wide frequency and temperature range. In the copper-doped KTN above the ferroelectric phase transition temperature, a relaxation process was observed to behave according to the Vogel-Fulcher-Tammann model. This process was not observed in the pure KTN crystal. Following the Adam-Gibbs theory of glass-forming liquids, this behavior was attributed to a cooperative rearrangement of dipolar clusters that are formed by off-center niobium ions around the copper impurity ions. This interpretation was substantiated by the observed difference in the configurational entropy between Cu-doped KTN and pure KTN crystals derived from differential scanning calorimetry measurements.

Original language	English
Article number	132104
Pages (from-to)	132104-1-132104-4
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	70
Issue number	13
DOIs	https://doi.org/10.1103/PhysRevB.70.132104
State	Published - Oct 2004

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title = "Glass-forming liquid kinetics manifested in a KTN: Cu crystal",

abstract = "The relaxation processes in pure and copper-doped potassium tantalate niobate (KTN) were investigated by dielectric spectroscopy over a wide frequency and temperature range. In the copper-doped KTN above the ferroelectric phase transition temperature, a relaxation process was observed to behave according to the Vogel-Fulcher-Tammann model. This process was not observed in the pure KTN crystal. Following the Adam-Gibbs theory of glass-forming liquids, this behavior was attributed to a cooperative rearrangement of dipolar clusters that are formed by off-center niobium ions around the copper impurity ions. This interpretation was substantiated by the observed difference in the configurational entropy between Cu-doped KTN and pure KTN crystals derived from differential scanning calorimetry measurements.",

author = "{Ben Ishai}, P. and {De Oliveira}, {C. E.M.} and Y. Ryabov and Yu Feldman and Agranat, {A. J.}",

year = "2004",

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T1 - Glass-forming liquid kinetics manifested in a KTN

T2 - Cu crystal

AU - Ben Ishai, P.

AU - De Oliveira, C. E.M.

AU - Ryabov, Y.

AU - Feldman, Yu

AU - Agranat, A. J.

PY - 2004/10

Y1 - 2004/10

N2 - The relaxation processes in pure and copper-doped potassium tantalate niobate (KTN) were investigated by dielectric spectroscopy over a wide frequency and temperature range. In the copper-doped KTN above the ferroelectric phase transition temperature, a relaxation process was observed to behave according to the Vogel-Fulcher-Tammann model. This process was not observed in the pure KTN crystal. Following the Adam-Gibbs theory of glass-forming liquids, this behavior was attributed to a cooperative rearrangement of dipolar clusters that are formed by off-center niobium ions around the copper impurity ions. This interpretation was substantiated by the observed difference in the configurational entropy between Cu-doped KTN and pure KTN crystals derived from differential scanning calorimetry measurements.

AB - The relaxation processes in pure and copper-doped potassium tantalate niobate (KTN) were investigated by dielectric spectroscopy over a wide frequency and temperature range. In the copper-doped KTN above the ferroelectric phase transition temperature, a relaxation process was observed to behave according to the Vogel-Fulcher-Tammann model. This process was not observed in the pure KTN crystal. Following the Adam-Gibbs theory of glass-forming liquids, this behavior was attributed to a cooperative rearrangement of dipolar clusters that are formed by off-center niobium ions around the copper impurity ions. This interpretation was substantiated by the observed difference in the configurational entropy between Cu-doped KTN and pure KTN crystals derived from differential scanning calorimetry measurements.

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Glass-forming liquid kinetics manifested in a KTN: Cu crystal

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