Effect of cationic substitution in the oxidative decontamination processes of nickel chromium ferrites

IF 3.3 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Progress in Nuclear Energy Pub Date : 2024-07-26 DOI:10.1016/j.pnucene.2024.105360

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引用次数: 0

Abstract

Addition of Zn²⁺ and Mg²⁺ ions to the coolant water is followed in boiling and pressurized water reactors to control the radiation field. These cation additions modify the composition of double-layered spinel nickel chromium ferrite oxide films formed on stainless steel. The primary objective of this paper is to offer a systematic perspective for comprehending the dissolution behaviour of non-stoichiometric oxides upon Zn²⁺ and Mg²⁺ addition. In this regard single-phased nickel chromium ferrites were synthesized and characterized by various techniques. The crystal morphology and band gap changed with an increase in lattice dimensions upon incremental substitution of Ni. The oxidative dissolution rates increased with increasing Mg²⁺ or Zn²⁺ in the Ni–Cr–Fe–O lattice with a maximum at x = 0.6. Magnesium-substituted nickel ferrites showed a higher dissolution kinetics compared to their zinc-substituted counterparts. The dissolution behavior and kinetics are explained on the basis of cation redistribution in the octahedral or tetrahedral sites of the spinel lattice. The Laser Raman Spectroscopic (LRS) analysis corroborated the X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) observations. These results will provide an insight into the mechanism of radioactivity removal kinetics for developing effective dose rate reduction practices for nuclear plants.

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阳离子取代对镍铬铁氧体氧化去污过程的影响

沸水反应堆和加压水反应堆在冷却水中添加 Zn2+ 和 Mg2+ 离子，以控制辐射场。这些阳离子的添加改变了在不锈钢上形成的双层尖晶石镍铬铁氧体薄膜的成分。本文的主要目的是提供一个系统的视角，以理解添加 Zn2+ 和 Mg2+ 时非化学计量氧化物的溶解行为。为此，采用各种技术合成了单相镍铬铁氧体并对其进行了表征。随着镍替代量的增加，晶体形态和带隙随着晶格尺寸的增加而发生变化。氧化溶解速率随着 Ni-Cr-Fe-O 晶格中 Mg2+ 或 Zn2+ 的增加而增加，在 x = 0.6 时达到最大值。与锌取代的镍铁晶相比，镁取代的镍铁晶显示出更高的溶解动力学。这种溶解行为和动力学是根据尖晶石晶格八面体或四面体位点中阳离子的重新分布来解释的。激光拉曼光谱（LRS）分析证实了 X 射线衍射（XRD）和 X 射线光电子能谱（XPS）的观察结果。这些结果将有助于深入了解放射性清除动力学机制，从而为核电厂制定有效的剂量率降低措施。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Progress in Nuclear Energy 工程技术-核科学技术

CiteScore

5.30

自引率

14.80%

发文量

331

审稿时长

3.5 months

期刊介绍： Progress in Nuclear Energy is an international review journal covering all aspects of nuclear science and engineering. In keeping with the maturity of nuclear power, articles on safety, siting and environmental problems are encouraged, as are those associated with economics and fuel management. However, basic physics and engineering will remain an important aspect of the editorial policy. Articles published are either of a review nature or present new material in more depth. They are aimed at researchers and technically-oriented managers working in the nuclear energy field. Please note the following: 1) PNE seeks high quality research papers which are medium to long in length. Short research papers should be submitted to the journal Annals in Nuclear Energy. 2) PNE reserves the right to reject papers which are based solely on routine application of computer codes used to produce reactor designs or explain existing reactor phenomena. Such papers, although worthy, are best left as laboratory reports whereas Progress in Nuclear Energy seeks papers of originality, which are archival in nature, in the fields of mathematical and experimental nuclear technology, including fission, fusion (blanket physics, radiation damage), safety, materials aspects, economics, etc. 3) Review papers, which may occasionally be invited, are particularly sought by the journal in these fields.