EPR study of ceria nanoparticles containing different concentration of Ce3+ ions

被引：30
|
作者：
Rakhmatullin, R. M. [1 ]
Semashko, V. V. [1 ]
Korableva, S. L. [1 ]
Kiiamov, A. G. [1 ,2 ]
Rodionov, A. A. [1 ]
Tschaggelar, R. [3 ]
van Bokhoven, J. A. [4 ,5 ]
Paun, C. [4 ,5 ]
机构：
[1] Kazan Fed Univ, Inst Phys, Kazan 420008, Russia
[2] Kazan Fed Univ, Ctr Quantum Technol, Kazan 420008, Russia
[3] Swiss Fed Inst Technol, Inst Phys Chem, CH-8093 Zurich, Switzerland
[4] Swiss Fed Inst Technol, Inst Chem & Bioengn, CH-8093 Zurich, Switzerland
[5] Lab Catalysis & Sustainable Chem PSI, Villigen, Switzerland
来源：
MATERIALS CHEMISTRY AND PHYSICS | 2018年 / 219卷
关键词：
Nanoparticles; Ceria; Electron paramagnetic resonance; Room temperature ferromagnetism; Spin-lattice relaxation; ELECTRON-PARAMAGNETIC-RESONANCE; SPIN-RESONANCE; CEO2; NANOPARTICLES; LATTICE EXPANSION; NANOCRYSTALLINE CERIA; OXIDE NANOPARTICLES; ROOM-TEMPERATURE; THERMAL-ANALYSIS; VALENCY STATES; DOPED CEO2;
D O I：
10.1016/j.matchemphys.2018.08.028
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The electron paramagnetic resonance of Ce3+ ions in ceria is a rather controversial issue. In this report we analyze the EPR line with g similar to 1.97 in the absorption spectra of ceria powders, which has been assigned in many studies to Ce3+ ions. Such an assignment is not in agreement with the experimental data nor with the theory of spin-lattice relaxation of rare earth ions in solids. Our statement is supported by our experimental results based on EPR spectroscopy of nanocrystalline ceria, synthesized in various ways, as well as by magnetization measurements of as-prepared and vacuum-annealed ceria nanoparticles. The possible model of the paramagnetic center, which is assigned to the EPR line with g similar to 1.97 in ceria, is an electron trapped near the surface Ce3+/Ce4+ redox pair.
引用
收藏
页码：251 / 257
页数：7
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