Structure-thermal properties relationship of borosilicate glasses containing MoO3

IF 2.8 2区工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Nuclear Materials Pub Date : 2025-04-28 DOI:10.1016/j.jnucmat.2025.155857

Xingquan Zhang , Yifan Xiong , Sijia Yu , Jingyu Yuan , Kui Zheng , Zhu Cui , Yongchang Zhu , Jichuan Huo

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引用次数: 0

Abstract

The effect of MoO₃ incorporation on structure and thermal properties (e.g., thermal diffusivity, heat capacity, and thermal conductivity) of a borosilicate glass with a composition of 59.76 SiO₂–14.46B₂O₃–2.90 Al₂O₃–11.46 Na₂O-11.42 CaO (mol%) was investigated systematically. MoO₃ incorporation induced phase separation and crystallization of CaMoO₄ and Na₂MoO₄ in borosilicate glass. CaMoO₄ phases with grain size of about 200 nm in diameter were homogenously dispersed in the glass matrix, while, Na₂MoO₄ as a second phase formed on the surface. In addition, MoO₃ incorporation resulted in re-polymerization of the glass network. These structural changes have obvious influence on thermal properties. MoO₃ additions up to 6 wt% decreased thermal diffusivity by 7.5 %, heat capacity by 27.8 % and thermal conductivity by 30.2 %. Correlations between the structure, microstructure and thermal properties were proposed. It is speculated that the decrease of thermal conductivity mainly results from the decrease of mean free path of phonons caused by interface scattering. The understanding of the linkages between structure, microstructure, and thermal properties should provide insights for the design of borosilicate glass compositions for vitrification of MoO₃-rich high-level waste.

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含MoO3硼硅酸盐玻璃的结构-热性能关系

系统地研究了MoO3掺入对组成为59.76 SiO2-14.46B2O3-2.90 Al2O3-11.46 na20 -11.42 CaO （mol%）的硼硅酸盐玻璃的结构和热性能（如热扩散系数、热容和导热系数）的影响。MoO3掺入诱导CaMoO4和Na2MoO4在硼硅酸盐玻璃中的相分离和结晶。晶粒直径约为200 nm的CaMoO4相均匀分散在玻璃基体中，而Na2MoO4作为第二相在表面形成。此外，MoO3的加入导致了玻璃网络的再聚合。这些结构变化对材料的热性能有明显影响。MoO3添加量达到6wt %时，热扩散率降低7.5%，热容降低27.8%，热导率降低30.2%。提出了结构、显微组织与热性能之间的关系。推测热导率的降低主要是由于界面散射导致声子平均自由程的减小。了解结构、微观结构和热性能之间的联系，将为设计用于富moo3高放废物玻璃化的硼硅酸盐玻璃组合物提供见解。

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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.