Confinement kinetics in a KTN:Cu crystal: Experiment and theory

Received 25 October 2005; revised manuscript received 3 January 2006; published 7 March 2006A dielectric relaxation process with nonmonotonic temperature dependence was observed in KTN:Cu at theferroelectric phase. The kinetics of this process were interpreted in terms of the free volume model. It is arguedthat in this system the small Cu