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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 >Non-stoichiometric non-bridging oxygens and five-coordinated aluminum in alkaline earth aluminosilicate glasses: Effect of modifier cation size
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Non-stoichiometric non-bridging oxygens and five-coordinated aluminum in alkaline earth aluminosilicate glasses: Effect of modifier cation size

机译：碱土金属铝硅酸盐玻璃中的非化学计量非桥连氧和五配位铝：改性剂阳离子尺寸的影响

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摘要

Both non-bridging oxygen (NBO) and high-coordinated aluminum (commonly ~VAl at atmospheric pressure) are believed to play important roles in the thermodynamic and transport properties of aluminosilicate melts but their changes with composition are not well understood, particularly in compositions that are charge-balanced or contain excess alumina. Here we present high-resolution ~(27)Al and ~(17)O MAS NMR data on barium aluminosilicate glasses, similar to previously studied calcium and potassium aluminosilicate glasses, allowing us to separate the effect of cation size versus cation charge. The NBO content decreases with increasing Al content but shows no significant difference compared to similar calcium aluminosilicate glasses. As there is a significant difference between similar potassium and calcium aluminosilicate glasses, this indicates that cation charge may be the important parameter in determining the amount of NBO present on the charge-balanced join. The VAl content increases with increasing Al content but is significantly lower than similar calcium aluminosilicate glasses. This data, together with the data from potassium and calcium aluminosilicate glasses, agrees with the well-known effect of increasing high coordinated aluminum with higher cation field. In contrast, the lack of changes observed in the non-stoichiometric NBO content despite the changes in the ~VAl content provides additional evidence to suggest that the formation of NBO and ~VAl is not linked.
机译：非桥连氧（NBO）和高配位铝（通常在大气压下为〜VAl）被认为在铝硅酸盐熔体的热力学和传输性能中起着重要作用，但它们对组成的变化尚不十分了解，特别是在电荷平衡或含有过量的氧化铝。在这里，我们提供了钡铝硅酸盐玻璃上的高分辨率〜（27）Al和〜（17）O MAS NMR数据，类似于先前研究的钙和钾铝硅酸盐玻璃，使我们能够区分阳离子大小与阳离子电荷的影响。 NBO含量随Al含量的增加而降低，但与类似的硅铝酸钙玻璃相比，无明显差异。由于类似的钾铝硅酸钙玻璃和钙铝硅酸钙玻璃之间存在显着差异，这表明阳离子电荷可能是确定电荷平衡连接上存在的NBO量的重要参数。 VAl含量随Al含量的增加而增加，但明显低于类似的铝硅酸钙玻璃。该数据与铝硅酸钾玻璃钙和钙的数据一起，与众所周知的增加高配位铝和更高阳离子场的效果相一致。相比之下，尽管〜VA1含量发生变化，但非化学计量NBO含量仍未观察到变化，这提供了其他证据表明NBO和〜VA1的形成没有联系。

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