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Nanostructure and magnetic anomaly of mechanosynthesized Ce$_{1-x}$Y$_{x}$O$_{2-δ}$ (x ≤ 0.3) solid solutions

Fabián, Martin 1; Menzel, Dirk; Yermakov, Anatoly Ye; Kolev, Hristo; Kaňuchová, Mária; Shi, Jianmin; Kováč, Jaroslav, Jr.; Kostova, Nina; Da Silva, Klebson L.; Senna, Mamoru 1; Harničárová, Marta; Valíček, Jan; Hahn, Horst 1; Šepelák, Vladimír 1
1 Institut für Nanotechnologie (INT), Karlsruher Institut für Technologie (KIT)

Abstract:

Electromagnetic properties of complex oxide solid solutions containing Ce and Y attract increasing interests due to their high application potential. Their properties are known to be dependent on many factors including grain size and crystal defects. Here we focus on unique features of nanocrystalline Ce$_{1-x}$Y$_{x}$O$_{2-δ}$ (x ≤ 0.3) solid solutions prepared via a mechanosynthesis. Mechanically activated CeO$_{2-δ}$ and mechanosynthesized Ce$_{1-x}$Y$_{x}$O$_{2-δ}$ exhibit room-temperature ferromagnetism. The saturation magnetization reaches maximum for the Ce$_{0.9}$Y$_{0.1}$O$_{2-δ}$ solid solution. XPS and Raman spectra show that Ce$^{Zahl}$4+s are partially reduced to Ce$^{3+}$, with simultaneous introduction of oxygen vacancies accumulated on surface of the solid solutions. An analysis of the experimental magnetization data and the determination of both the spin state and the concentration of magnetic carriers revealed that a small part of the Ce$^{3+}$ spins (<1%) is responsible for the magnetic state of the Ce$_{1-x}$Y$_{x}$O$_{2-δ}$ system. Existence of clusters with a short-range antiferromagnetic order is also suspected.


Postprint §
DOI: 10.5445/IR/1000134680
Veröffentlicht am 01.02.2022
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 01.2021
Sprache Englisch
Identifikator ISSN: 0022-3697
KITopen-ID: 1000134680
HGF-Programm 43.31.01 (POF IV, LK 01) Multifunctionality Molecular Design & Material Architecture
Erschienen in Journal of physics and chemistry of solids
Verlag Elsevier
Band 148
Seiten Art.-Nr.: 109673
Nachgewiesen in Dimensions
Scopus
Web of Science
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