Synthesis and atomic scale characterization of Er2O3 nanoparticles
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2018
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Nanotechnology
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In the investigation reported in this paper a modified thermal decomposition method was
developed to produce very small Er2O3 nanoparticles (NPs). Particles structure, shape and size
were characterized by x-ray diffraction and transmission electron microscopy which showed that
the synthesis by thermal decomposition under O2 atmosphere produced very small and
monodisperse NPs, allowing the investigation of finite-size and surface effects. Results of
magnetization measurements showed that the smallest particles present the highest values of
susceptibility that decrease as particle size increases. Specific heat measurements indicate that
the sample with the smallest NPs (diameter ∼5 nm) has a Néel temperature of 0.54 K. The local
structure of particles was investigated by measurements of hyperfine interactions with perturbed
angular correlation spectroscopy using 111Cd as probe nuclei replacing the cationic sites. Results
showed that the relative population of sites 8b increases in both the core and surface layer of
particles.
Como referenciar
CORREA, EDUARDO L.; BOSCH-SANTOS, BRIANNA; FREITAS, RAFAEL S.; POTIENS, MARIA da P.A.; SAIKI, MITIKO; CARBONARI, ARTUR W. Synthesis and atomic scale characterization of Er2O3 nanoparticles: enhancement of magnetic properties and changes in the local structure. Nanotechnology, v. 29, n. 20, 2018. DOI: 10.1088/1361-6528/aab3f8. Disponível em: http://repositorio.ipen.br/handle/123456789/29064. Acesso em: 23 May 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.