Synthesis, processing, and electron paramagnetic resonance response of Y1.98Eu0.02O3 micro rods
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2018
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International Journal of Modern Physics: Conference Series
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Resumo
Innovating dosimetric materials, which includes design and development of new dosimetric
materials based on rare earth oxides, is challenging. Yttrium oxide (Y2O3) is one of the most
important sesquioxides and presents crystal characteristics that enable doping with rare earth ions,
making it a promising material for radiation dosimetry. This paper reports on the development and
measurement of Electron Paramagnetic Resonance (EPR) signal response for Y1.98Eu0.02O3 micro
rods that have undergone facile low-pressure hydrothermal synthesis and bio-prototyping. Assynthesized
powders with narrow sub-micrometer particle size distribution with d50 of 584 nm
exhibited a reactive surface, which led to the formation of stable aqueous suspensions by
controlling the surface charge density of particles through alkaline pH adjustment. Ceramic
samples with dense microstructure were formed by sintering at 1600 ºC for 4h at ambient
atmosphere. Y1.98Eu0.02O3 micro rods were irradiated using a 60Co source with doses from 1 to
100 kGy, and EPR spectra were measured at room temperature in X-band microwave frequencies.
Sintered samples exhibited linearity of the main EPR signal response from 10 Gy to 10 kGy.
Supralinearity was observed for higher doses, which is possibly ascribed to formation of more
defects. Using europium as a dopant enhanced the EPR signal of yttrium rods remarkably, due to
4f–4f transitions of the Eu3+ ion. These innovative findings make europium-doped yttrium oxide a
promising material for radiation dosimetry.
Como referenciar
SANTOS, S.C.; RODRIGUES JUNIOR, O.; CAMPOS, L.L. Synthesis, processing, and electron paramagnetic resonance response of Y1.98Eu0.02O3 micro rods. International Journal of Modern Physics: Conference Series, v. 48, p. 1860112-1 - 1860112-8, 2018. DOI: 10.1142/S2010194518601126. Disponível em: http://repositorio.ipen.br/handle/123456789/29433. Acesso em: 19 Apr 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.