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γ-radiation-induced centers in irradiated perovskite SrCeO3 and their role in thermally stimulated reactions: Fluorescence, thermally stimulated luminescence, electron paramagnetic resonance and shielding studies.

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Title: γ-radiation-induced centers in irradiated perovskite SrCeO3 and their role in thermally stimulated reactions: Fluorescence, thermally stimulated luminescence, electron paramagnetic resonance and shielding studies.
Authors: Singh, Vijay1 (AUTHOR) vijayjiin2006@yahoo.com, Watanabe, S.2 (AUTHOR), Rao, T.K. Gundu2 (AUTHOR), Singh, V.P.3 (AUTHOR), Cano, Nilo F.4 (AUTHOR)
Source: Ceramics International. Dec2024:Part B, Vol. 50 Issue 23, p50648-50656. 9p.
Subjects: Mass attenuation coefficients, Electron paramagnetic resonance, X-ray powder diffraction, Radioactive wastes, Thermoluminescence
Abstract: One promising host for actinide radioactive wastes is orthorhombic perovskite-type oxide. Perovskite SrCeO 3 ceramic was synthesized by nitrate-fuel combustion, which includes the organic fuel glycine. Powder X-ray diffraction was utilized to determine the structural features, and γ-radiation-induced changes and shielding properties were investigated in perovskite SrCeO 3. In a mixed-phase sample, a bright sky-blue luminescence was observed, and two thermoluminescence (TL) peaks were seen in irradiated SrCeO 3 ceramic. Electron paramagnetic resonance (EPR) spectrum in γ-irradiated SrCeO 3 ceramic had contributions from five defect centers. Center I having an isotropic g -value equal to 2.0283, is ascribed to an O− ion, while center II with an axial g -tensor with principal values g || = 2.0224 and g ⊥ = 2.0068 is determined as an O 2 − ion. O− ion relates to the TL peak at 215 °C. Center III with a g -value equal to 2.0009 is identified as an F+ center and is related to the 185 °C TL peak. The defect center associated with center IV is also identified as an F+ center. An additional defect center in the higher field region of the spectrum is assigned to an F+ center, and the center results from an F-center (oxygen vacancy with two electrons). The mass attenuation coefficients, effective atomic numbers, and half-value layer thicknesses concerning shielding property effectiveness were computed and it was found that the perovskite SrCeO 3 ceramic provided superior γ-shielding properties. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:One promising host for actinide radioactive wastes is orthorhombic perovskite-type oxide. Perovskite SrCeO 3 ceramic was synthesized by nitrate-fuel combustion, which includes the organic fuel glycine. Powder X-ray diffraction was utilized to determine the structural features, and γ-radiation-induced changes and shielding properties were investigated in perovskite SrCeO 3. In a mixed-phase sample, a bright sky-blue luminescence was observed, and two thermoluminescence (TL) peaks were seen in irradiated SrCeO 3 ceramic. Electron paramagnetic resonance (EPR) spectrum in γ-irradiated SrCeO 3 ceramic had contributions from five defect centers. Center I having an isotropic g -value equal to 2.0283, is ascribed to an O− ion, while center II with an axial g -tensor with principal values g || = 2.0224 and g ⊥ = 2.0068 is determined as an O 2 − ion. O− ion relates to the TL peak at 215 °C. Center III with a g -value equal to 2.0009 is identified as an F+ center and is related to the 185 °C TL peak. The defect center associated with center IV is also identified as an F+ center. An additional defect center in the higher field region of the spectrum is assigned to an F+ center, and the center results from an F-center (oxygen vacancy with two electrons). The mass attenuation coefficients, effective atomic numbers, and half-value layer thicknesses concerning shielding property effectiveness were computed and it was found that the perovskite SrCeO 3 ceramic provided superior γ-shielding properties. [ABSTRACT FROM AUTHOR]
ISSN:02728842
DOI:10.1016/j.ceramint.2024.09.409