Cu-Related Paramagnetic Centers in Cu- and (Cu,Y)-Doped ZrO2 Nanopowders
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Date
2025
Authors
Nosenko, Valentyna
Vorona, Igor
Trachevskyi, Viacheslav
Zagorodniy, Yuriy
Okulov, Sergey
Isaieva, Oksana
Yukhymchuk, Volodymyr
Kulinich, Sergei
Borkovska, Lyudmyla
Khomenkova, Larysa
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Abstract
In this work, we studied Cu-doped and (Cu,Y)-codoped ZrO2 nanopowders produced through a coprecipitation approach to identify the nature of Cu-related bulk and surface paramagnetic centers. We conducted EPR, NMR, and Raman scattering studies on Cu- and (Cu,Y)-doped ZrO2 powders calcined at different temperatures. At low calcination temperatures (400 ◦C) and low Cu loading (0.1–1.0 mol.% of CuO), the EPR signal was found to be attributed to surface-related Cu-H2O complexes. For powders with higher Cu content (up to 8.0 mol.% of CuO), the superparamagnetic signal associated with the formation of copper clusters was observed. At higher calcination temperatures, the destruction of Cu-related surface complexes promotes the incorporation of Cu2+ ions into the bulk of ZrO2 nanocrystals at Zr positions. Co-doping ZrO2 with Cu and Y was observed to facilitate the incorporation of Cu2+ ions into cation sites at lower calcination temperatures when compared with Cu-doped ZrO2.
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Keywords
zirconia, doping, copper, EPR, NMR, Raman, paramagnetic centers, article
Citation
Cu-Related Paramagnetic Centers in Cu- and (Cu,Y)-Doped ZrO2 Nanopowders / Valentyna Nosenko, Igor Vorona, Volodymyr Trachevsky, Yuriy Zagorodniy, Sergey Okulov, Oksana Isaieva, Volodymyr Yukhymchuk, Sergei A. Kulinich, Lyudmyla Borkovska, Larysa Khomenkova // Materials. - 2025. - Vol. 18, Issue 3. - Art. no. 605. - https://doi.org/10.3390/ma18030605