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首页> 外文期刊>The American mineralogist >Non-bridging oxygen and high-coordinated aluminum in metaluminous and peraluminous calcium and potassium aluminosilicate glasses: High-resolution ~(17)O and ~(27)Al MAS NMR results
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Non-bridging oxygen and high-coordinated aluminum in metaluminous and peraluminous calcium and potassium aluminosilicate glasses: High-resolution ~(17)O and ~(27)Al MAS NMR results

机译：钙铝硅酸盐和钙铝硅酸盐玻璃中的不桥接氧和高配位铝：高分辨率〜（17）O和〜（27）Al MAS NMR结果

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摘要

Change in configuration and structure with composition are important components of thermodynamic and transport properties of most aluminosilicate melts, but the complex interactions, particularly in metaluminous and peraluminous compositions, are not yet well understood. In this paper, we present high-resolution ~(27)Al and 17O MAS and 3QMAS NMR data on several calcium and potassium aluminosilicate glasses prepared at several SiO_2 isopleths, ranging from peralkaline to peraluminous compositions. In all calcium aluminosilicate glasses, the ~VAl content increases with increasing Al content, while the NBO content decreases (in one series, below the limit of detection), consistent with other recent NMR studies of calcium aluminosilicate glasses. An increase in ~VAl content per total Al is also observed as the glass approaches the calcia-silica binary. In the potassium aluminosilicate glasses, NBO is directly quantified for the first time in metaluminous and peraluminous compositions; ~VAl is below the detection limit. We discuss possible mechanisms for the incorporation of alumina into the melt structure and show how changes in the ~VAl content as a function of composition may be used to eliminate mechanisms that do not fit the observed data. We also explore reactions, which show the difficulty of explaining the NBO present on the metaluminous join with only the observed ~VAl, implying the necessity of multiple reactions producing NBO in such compositions.
机译：构型和结构随组成的变化是大多数铝硅酸盐熔体的热力学和传输性能的重要组成部分，但复杂的相互作用，尤其是在金属和高铝组成中，尚未得到很好的理解。在本文中，我们提供了在数个SiO_2等度下制备的几种钙铝酸钾和钾铝硅酸盐玻璃的高分辨率〜（27）Al和17O MAS和3QMAS NMR数据，范围从高碱性到高铝组成。在所有铝硅酸钙玻璃中，〜Al含量随Al含量的增加而增加，而NBO含量降低（一系列，低于检出限），这与最近对铝硅酸钙玻璃的其他NMR研究一致。随着玻璃接近氧化钙-二氧化硅二元，还观察到每总Al中〜VA1含量的增加。在铝硅酸钾玻璃中，NBO首次直接定量在金属和高铝成分中; 〜VA1低于检测极限。我们讨论了将氧化铝掺入熔体结构的可能机理，并显示了〜VA1含量随组成的变化如何可用于消除不符合所观察数据的机理。我们还探索了反应，这表明难以仅用观察到的〜VAl来解释存在于金属连接上的NBO，这意味着在此类组合物中必须进行多次反应才能产生NBO。

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