The influence of RuO2 crystal morphology on the conductivity of glass melts during vitrification process

IF 3.2 2区工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Nuclear Materials Pub Date : 2025-07-28 DOI:10.1016/j.jnucmat.2025.156068

Xilei Duan , Qiang Zhang , Xueyang Liu , Zhenghua Qian , Kui Zhang , Guanyu Zhu , Xiaofeng Liu , Zhanglian Xu , Yanbo Qiao

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Abstract

In this work, we investigate the effects of acicular and granular RuO₂ crystals on the conductivity of nuclear glass melts. Acicular RuO₂ (RuO₂#a) and granular RuO₂ (RuO₂#g) were prepared by molten salt synthesis (MSS). RuO₂#a appears as acicular crystals up to several tens of micrometers in length, while RuO₂#g appears as clusters of nanoparticles. Both crystals have the same elemental compositions and cell structures. RuO₂#a is more effective in forming a continuous conduction network within the nuclear glass, leading to a greater improvement in the conductivity of nuclear waste glass melts. Electrochemical impedance spectroscopy (EIS) analysis shows that the base glass and the low RuO₂ nuclear waste glass behave as ionic conductors, while the high RuO₂ waste glass (x>0.4 vol%) exhibits metal-like conduction below the glass transition temperature (T_g). The critical volume fractions (X_c) calculated using the generalized effective medium (GEM) equation are 0.1 vol% for RuO₂#a and 0.65 vol% for RuO₂#g. While both acicular and granular RuO₂ crystals improve the electrical conductivity of the nuclear glass melts, the RuO₂#a crystals have a significantly greater effect.

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在玻璃化过程中，若氧晶体形态对玻璃熔体电导率的影响

在这项工作中，我们研究了针状和粒状RuO2晶体对核玻璃熔体电导率的影响。采用熔盐合成（MSS）法制备了针状RuO2 （RuO2#a）和粒状RuO2 （RuO2#g）。ruo_2 #a以针状晶体的形式出现，其长度可达几十微米，而ruo_2 #g则以纳米粒子簇的形式出现。两种晶体具有相同的元素组成和细胞结构。若o2 #a能更有效地在核玻璃内部形成连续的导通网络，从而使核废料玻璃熔体的导电性得到更大的改善。电化学阻抗谱（EIS）分析表明，基玻璃和低RuO2的核废料玻璃表现为离子导体，而高RuO2的核废料玻璃（x>0.4 vol%）在玻璃化转变温度（Tg）以下表现为类金属导电。用广义有效介质（GEM）方程计算的临界体积分数（Xc）对于ruo_2 #a为0.1 vol%，对于ruo_2 #g为0.65 vol%。针状和粒状RuO2晶体均能提高核玻璃熔体的导电性，但RuO2#a晶体的作用更大。

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

Journal of Nuclear Materials 工程技术-材料科学：综合

CiteScore

5.70

自引率

25.80%

发文量

601

审稿时长

63 days

期刊介绍： The Journal of Nuclear Materials publishes high quality papers in materials research for nuclear applications, primarily fission reactors, fusion reactors, and similar environments including radiation areas of charged particle accelerators. Both original research and critical review papers covering experimental, theoretical, and computational aspects of either fundamental or applied nature are welcome. The breadth of the field is such that a wide range of processes and properties in the field of materials science and engineering is of interest to the readership, spanning atom-scale processes, microstructures, thermodynamics, mechanical properties, physical properties, and corrosion, for example. Topics covered by JNM Fission reactor materials, including fuels, cladding, core structures, pressure vessels, coolant interactions with materials, moderator and control components, fission product behavior. Materials aspects of the entire fuel cycle. Materials aspects of the actinides and their compounds. Performance of nuclear waste materials; materials aspects of the immobilization of wastes. Fusion reactor materials, including first walls, blankets, insulators and magnets. Neutron and charged particle radiation effects in materials, including defects, transmutations, microstructures, phase changes and macroscopic properties. Interaction of plasmas, ion beams, electron beams and electromagnetic radiation with materials relevant to nuclear systems.