A solid solution of 8mol% of scandia-stabilized cubic-zirconia (8ScSZ) was

prepared by co-precipitation technique. The synthesized powder has an average

crystallite size 40nm, surface area of 8.49m2/g, and agglomerated particle size of

150nm. The activation energy of 8ScSZ was calculated from impedance loss

spectra; electrical modulus spectra were in the range of 0.90 to 1.30eV. The

frequency and temperature-dependent conductivities and impedances were

measured at 50Hz to 1MHz and 300 to 900K, respectively. Complex impedance

spectra, complex modulus formalism and complex conductivity spectra were

carefully analyzed in order to separate the grain, grain boundary and electrode–

electrolyte effects. Analysis of ac impedance data using complex impedance

indicates a typical negative temperature coefficient of resistance behaviour of the

materials. The intrinsic conductivity was mainly due to hopping of mobile ions

among the available localized site. Relaxation time obtained from complex

conductivity spectra were matched well with the impedance loss and modulus loss

spectra. Impedance analysis suggested the presence of temperature-dependent

electrical relaxation process in the material.

Ionic Conductivity and Electrical Relaxation of Nanocrystalline Scandia-Stabilized

c-Zirconia Using Complex Impedance Analysis. A.Kumar, I.Manna: Physica B,

2008, 403[13-16], 2298-305