Nosenko, ValentynaVorona, IgorTrachevskyi, ViacheslavZagorodniy, YuriyOkulov, SergeyIsaieva, OksanaYukhymchuk, VolodymyrKulinich, SergeiBorkovska, LyudmylaKhomenkova, Larysa2025-03-132025-03-132025Cu-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/ma180306051996-1944https://doi.org/10.3390/ma18030605https://ekmair.ukma.edu.ua/handle/123456789/33934In 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.enzirconiadopingcopperEPRNMRRamanparamagnetic centersarticleArticle