Abstract
The powder of Zr0:92Y0:08O2 (YSZ), Ce0:9Gd0:1O2i‐ (GDC) and Sm0:15Ce0:85O2i‐ (SDC) compounds from the company Fuel Cell Materials were used for sintering of ceramic samples in air at temperature T = 1673 K. The surface of the prepared ceramics was studied by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). Results of the performed XPS investigations revealed that cerium exists as Ce 3+ and Ce 4+ in both the Ce0:9Gd0:1O2i‐ and Sm0:15Ce0:85O2i‐ ceramics. XPS spectra of O 1s of all the investigated materials demonstrated two peaks corresponding to oxygen O(1) in crystal lattice and to adsorbed oxygen O(2). Measurements of complex impedance, electric conductivity, dielectric permittivity, and tan ‐ of dielectric losses were carried out in frequency range 10 6 n1.2¢10 9 Hz at temperatures ranging from 300 K to 700 K. Relaxation dispersion of the electric parameters has been found for all the compounds. The dispersion is caused by the oxygen vacancy (VO †† ) transport in grains of the ceramic samples.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
