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The powder of Zr0:92Y0:08O2 (YSZ), Ce0:9Gd0:1O2¡- (GDC) and Sm0:15Ce0:85O2¡- (SDC) compounds from the com- pany 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). Re- sults of the performed XPS investigations revealed that cerium exists as Ce 3+ and Ce 4+ in both the Ce0:9Gd0:1O2¡- and Sm0:15Ce0:85O2¡- 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, di- electric permittivity, and tan - of dielectric losses were carried out in frequency range 10 6 ñ1.2¢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.

Peculiarities of ionic transport of oxygen vacancy conducting superionic ceramics