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

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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 languageEnglish
Article number132104
Pages (from-to)132104-1-132104-4
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number13
StatePublished - Oct 2004
Externally publishedYes


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