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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Effect of BaO addition on the structural aspects and thermophysical properties of sodium borosilicate glasses
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Effect of BaO addition on the structural aspects and thermophysical properties of sodium borosilicate glasses

机译：BaO添加对硼硅酸钠玻璃结构和热物理性能的影响

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摘要

Sodium borosilicate glasses containing different amounts of BaO were prepared by a conventional melt quench method and characterized for their structural aspects b y Si-29, B-11 NMR and IR spectroscopy. From Si-29 MAS NMR studies, it has been inferred that these glasses consist of Q(2) and Q(3) structural units of silicon and that the addition of BaO results in the marginal conversion of Q(3) to Q(2) struc tural units. There is no direct interaction between Ba2+ ions and boron structural units, as revealed by the identical values of the relative concentration of BO3 and BO4 structural units and quadrupolar coupling constant values for the BO3 structural units. The identical values of glass transition temperature and vibrational frequencies corresponding to Si-O-Si/Si-O-B and B-O linkages of all the samples further support this. As the borosilicate network is unaffected, the systematic increase in the values of thermal expansion coefficient with increase in BaO content has been attributed to the increase in the relative concentration of less rigid Ba-O linkages compared to the more rigid Si-O and B-O linkages in the glass. Such studies will be useful for the development of matrices for the management of nuclear waste generated during the reprocessing of the spent fuel from thoria based reactors. (C) 2007 Elsevier B.V. All rights reserved.
机译：通过常规的熔融淬火方法制备了包含不同量的BaO的硼硅酸钠玻璃，并通过Si-29，B-11 NMR和IR光谱对其结构进行了表征。从Si-29 MAS NMR研究中可以推断出，这些玻璃由硅的Q（2）和Q（3）结构单元组成，BaO的添加导致Q（3）到Q（2）的边际转化）结构单元。 Ba2 +离子与硼结构单元之间没有直接相互作用，这由BO3和BO4结构单元的相对浓度的相同值以及BO3结构单元的四极耦合常数值所揭示。与所有样品的Si-O-Si / Si-O-B和B-O键对应的玻璃化转变温度和振动频率的相同值进一步支持了这一点。由于硼硅酸盐网络不受影响，随着BaO含量的增加，热膨胀系数值的系统性增加归因于刚性较低的Ba-O键与刚性较高的Si-O和BO键相比的相对浓度增加在玻璃杯中。这样的研究对于开发用于处理基于的反应堆的乏燃料的后处理过程中产生的核废料的矩阵将是有用的。 （C）2007 Elsevier B.V.保留所有权利。

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