A complex impedance spectroscopy study was made of 0.91Pb(Zn1/3Nb2/3)O3-0.09PbTiO3 single crystals at 25 to 525C, and frequencies of 1kHz to 1MHz. The alternating-current conductivity was computed from the impedance data and the activation energy for conduction at different frequencies was determined. Frequency explicit plots of imaginary components of impedance exhibited Debye-like peak shapes. Cole-Cole diagrams were observed in the high temperature regime. Temperature dependent conductivity measurement and Cole-Cole plots fairly establish the existence of quenched random defects in this system.

Investigation of Intrinsic Defect Structure in 0.91Pb(Zn1/3Nb2/3)O3-0.09PbTiO3 Single Crystal through AC Conductivity. A.R.James, S.Priya, K.Uchino, K.Srinivas, V.V.Kiran: Japanese Journal of Applied Physics - 1, 2002, 41[8], 5272-6