Crystalline and magnetic properties of CoO nanoparticles locally investigated by using radioactive indium tracer
Autor: | Cleidilane Sena Costa, B. Bosch-Santos, L. F. D. Pereira, Artur W. Carbonari, Fernando Bacci Effenberger, Renata V. Santos, Anastasia Burimova, B.S. Correa, Gabriel A. Cabrera-Pasca, Rafael S. Freitas, Larissa Otubo |
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Rok vydání: | 2021 |
Předmět: |
Multidisciplinary
Materials science Science Analytical chemistry Nucleation Nanoparticle chemistry.chemical_element Article Nanocrystalline material chemistry Magnetic properties and materials Transmission electron microscopy Nanoparticles Medicine Surface layer Cobalt oxide Hyperfine structure Indium |
Zdroj: | Scientific Reports, Vol 11, Iss 1, Pp 1-13 (2021) Scientific Reports |
ISSN: | 2045-2322 |
Popis: | We herein report a comprehensive investigation on the magnetic, structural, and electric properties of CoO nanoparticles with different sizes by local inspection through hyperfine interactions measured in a wide range of temperatures (10–670 K) by using radioactive $$^{111}$$ 111 In($$^{111}$$ 111 Cd) tracers with the perturbed angular correlations technique. Small cobalt oxide nanoparticles with the characteristic size of 6.5 nm have been prepared by the wet chemical route that turned out to be essential to incorporate radioactivity tracers during nucleation and growth of the particles. Nanocrystalline samples with 22.1 nm size were obtained by thermal treatments under low pressure of helium at 670 K. The hyperfine data were correlated with X-ray diffraction, ZFC–FC magnetic measurements, and transmission electron microscopy to describe the structure, magnetic properties, size, and shape of samples. An analysis of the temperature evolution of hyperfine parameters revealed that the structural distortion and the magnetic disorder in the core and on the surface layer play an important role in the magnetic behavior of CoO nanoparticles. |
Databáze: | OpenAIRE |
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