Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1813083 | Physica B: Condensed Matter | 2008 | 8 Pages |
Abstract
A solid solution of 8Â mol% of scandia-stabilized cubic-zirconia (8ScSZ) has been prepared by co-precipitation technique. The synthesized powder has an average crystallite size â¼40Â nm, surface area of 8.49Â m2/g, and agglomerated particle size of 150Â nm. The activation energy of 8ScSZ has been calculated from impedance loss spectra; electrical modulus spectra are in the range of 0.90-1.30Â eV. The frequency and temperature-dependent conductivities and impedance were measured in range of 50Â Hz-1Â MHz and 300-900Â K, respectively. Complex impedance spectra, complex modulus formalism and complex conductivity spectra have been 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 (NTCR) behavior of the materials. The intrinsic conductivity is mainly due to hopping of mobile ions among the available localized site. Relaxation time obtained from complex conductivity spectra are matched well with the impedance loss and modulus loss spectra. Impedance analysis suggests the presence of temperature-dependent electrical relaxation process in the material.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Ashok Kumar, I. Manna,