辐照包晶 SrCeO3 中的γ 辐射诱导中心及其在热刺激反应中的作用:荧光、热刺激发光、电子顺磁共振和屏蔽研究

IF 5.1 2区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS
Vijay Singh , S. Watanabe , T.K. Gundu Rao , V.P. Singh , Nilo F. Cano
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引用次数: 0

摘要

正长晶包晶型氧化物是锕系元素放射性废物的一个有前途的宿主。利用硝酸盐燃料(包括有机燃料甘氨酸)燃烧合成了包晶 SrCeO3 陶瓷。利用粉末 X 射线衍射确定了其结构特征,并研究了γ 辐射诱导的包晶 SrCeO3 变化和屏蔽性能。在混合相样品中观察到明亮的天蓝色发光,在辐照 SrCeO3 陶瓷中观察到两个热致发光(TL)峰。γ-辐照 SrCeO3 陶瓷中的电子顺磁共振(EPR)谱来自五个缺陷中心。中心 I 的各向同性 g 值等于 2.0283,归因于 O- 离子,而中心 II 的轴向 g 张量主值 g|| = 2.0224 和 g⊥ = 2.0068 被确定为 O2- 离子。O- 离子与 215 °C 时的 TL 峰有关。中心 III 的 g 值等于 2.0009,被确定为 F+ 中心,与 185 °C 的 TL 峰有关。与中心 IV 相关的缺陷中心也被确定为 F+ 中心。光谱高场区的另一个缺陷中心被确定为 F+ 中心,该中心来自 F 中心(具有两个电子的氧空位)。计算了有关屏蔽性能有效性的质量衰减系数、有效原子序数和半值层厚度,发现包晶体 SrCeO3 陶瓷具有优异的 γ 屏蔽性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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
One promising host for actinide radioactive wastes is orthorhombic perovskite-type oxide. Perovskite SrCeO3 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 SrCeO3. In a mixed-phase sample, a bright sky-blue luminescence was observed, and two thermoluminescence (TL) peaks were seen in irradiated SrCeO3 ceramic. Electron paramagnetic resonance (EPR) spectrum in γ-irradiated SrCeO3 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 O2 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 SrCeO3 ceramic provided superior γ-shielding properties.
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来源期刊
Ceramics International
Ceramics International 工程技术-材料科学:硅酸盐
CiteScore
9.40
自引率
15.40%
发文量
4558
审稿时长
25 days
期刊介绍: Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.
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