| 1. |
Demchenko Iraida N.♦, Nikiforow K.♦, Chernyshova M.♦, Melikhov Y., Syryanyy Y.♦, Korsunska N.♦, Khomenkova L.♦, Brodnikovskyi Y.♦, Brodnikovskyi D.♦, X-ray Photoelectron Spectroscopy Analysis of Scandia-Ceria-Stabilized Zirconia Composites with Different Transport Properties,
Materials, ISSN: 1996-1944, DOI: 10.3390/ma16165504, Vol.16, No.16, pp.5504-1-12, 2023 Abstract:
This work aims to study a possible modification in the electronic structure of scandia-ceria-stabilized zirconia (10Sc1CeSZ) ceramics sintered at different temperatures. In addition to using X-ray diffraction (XRD), scanning electron microscopy (SEM) and impedance spectroscopy to investigate the structural and electrical properties, we employed X-ray photoelectron spectroscopy (XPS) to determine the chemical state information of the atoms involved, along with compositional analysis. As expected, a significant increase in grain ionic conductivity with the sintering temperature was present. This increase was accompanied by a decrease in the porosity of the samples, an increase in the grain size, and a transformation from the rhombohedral to the cubic phase. The phase transformation was detected not only using XRD, but also using XPS and, for this type of ceramic, XPS detected this transformation for the first time. In addition to the changes in the structural characteristics, the increase in the ionic conductivity was accompanied by a modification in the electronic structure of the ceramic surface. The XPS results showed that the surface of the ceramic sintered at the lower temperature of 1100 °C had a higher amount of Zr–OH bonds than the surface of the ceramic sintered at the higher temperature of 1400 °C. The existence of these Zr–OH bonds was confirmed using Fourier-transform infrared spectroscopy (FTIR). From this result, taken together with the difference between the oxygen/zirconium ratios in these ceramics, also identified using XPS, we conclude that there were fewer oxygen vacancies in the ceramic sintered at the lower temperature. It is argued that these two factors, together with the changes in the structural characteristics, have a direct influence on the conductive properties of the studied ceramics sintered at different temperatures.
Keywords:
XPS, zirconia, scandia-ceria-stabilized zirconia, ScCSZ, SOFC Affiliations:
| Demchenko Iraida N. | - | Institute of Physics, Polish Academy of Sciences (PL) | | Nikiforow K. | - | other affiliation | | Chernyshova M. | - | Institute of Plasma Physics and Laser Microfusion (PL) | | Melikhov Y. | - | IPPT PAN | | Syryanyy Y. | - | Institute of Physics, Polish Academy of Sciences (PL) | | Korsunska N. | - | other affiliation | | Khomenkova L. | - | other affiliation | | Brodnikovskyi Y. | - | other affiliation | | Brodnikovskyi D. | - | other affiliation |
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| 2. |
Wilczewski S.♦, Skórczewska K.♦, Tomaszewska J.♦, Osial M., Dąbrowska A.♦, Nikiforow K.♦, Jenczyk P., Grzywacz H., Graphene Modification by Curcuminoids as an Effective Method to Improve the Dispersion and Stability of PVC/Graphene Nanocomposites,
Molecules, ISSN: 1420-3049, DOI: 10.3390/molecules28083383, Vol.28, No.8, pp.1-25, 2023Keywords:
graphene, curcuminoids, poly(vinyl chloride), nanocomposites stability, polymer films Affiliations:
| Wilczewski S. | - | other affiliation | | Skórczewska K. | - | other affiliation | | Tomaszewska J. | - | other affiliation | | Osial M. | - | IPPT PAN | | Dąbrowska A. | - | University of Warsaw (PL) | | Nikiforow K. | - | other affiliation | | Jenczyk P. | - | IPPT PAN | | Grzywacz H. | - | IPPT PAN |
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