Peculiarities of ionic transport of oxygen vacancy conducting superionic ceramics
| Autor: | V. Kazlauskienė, A.F. Orliukas, A. Petraitis, Darius Milčius, Giedrius Laukaitis, J. Dudonis, Tomas Šalkus, J. Miškinis, A. Kežionis |
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| Rok vydání: | 2009 |
| Předmět: |
Materials science
Scanning electron microscope Analytical chemistry General Physics and Astronomy chemistry.chemical_element Ionic bonding Cerium X-ray photoelectron spectroscopy chemistry Electrical resistivity and conductivity visual_art visual_art.visual_art_medium Dielectric loss Ceramic Yttria-stabilized zirconia |
| Zdroj: | Lithuanian Journal of Physics. 49:317-322 |
| ISSN: | 1648-8504 |
| DOI: | 10.3952/lithjphys.49310 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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