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首页> 外文期刊>Materials Chemistry and Physics >A High-energy X-ray Diffraction, ~(31)p And ~(11)b Solid-state Nmr Study Of The Structure Of Aged Sodium Borophosphate Glasses
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A High-energy X-ray Diffraction, ~(31)p And ~(11)b Solid-state Nmr Study Of The Structure Of Aged Sodium Borophosphate Glasses

机译：高能X射线衍射，老化的硼磷酸盐玻璃结构的〜（31）p和〜（11）b固态Nmr研究

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摘要

The structure of aged melt-quenched sodium borophosphate glasses of composition (P_2O_5)_(40)(B_2O_3)_x(Na_2O)_(60-x) (with x in the range 10-40) has been studied by high-energy X-ray diffraction (HEXRD), ~(31)P and ~(11)B magic angle spinning (MAS) NMR. Similar to the fresh samples, both P-O—P and P—O—B linkages are found to be present in these glasses. All three techniques show that the cross-linking between borate and phosphate units increases with boron oxide content. Distinctively upon aging, the glass is found to hydrolyze causing the network to degrade. At the same time, crystalline phases are now also observed. XRD and DTA show that the samples have a higher tendency towards crystallization with increasing boron oxide content upon exposed to moisture.~(31)P and ~(11)B MAS NMR results are in agreement with these findings. TGA data show that samples with higher boron oxide content take up more moisture upon aging, suggesting that crystallization may be associated with glass hydrolysis. HEXRD results also suggest that sodium ions are preferentially associated with borate units with increasing boron oxide content.
机译：通过高能X研究了组成为（P_2O_5）_（40）（B_2O_3）_x（Na_2O）_（60-x）（x的范围为10-40）的老化的熔融淬火硼磷酸钠玻璃的结构。射线衍射（HEXRD），〜（31）P和〜（11）B幻角旋转（MAS）NMR。类似于新鲜样品，发现这些玻璃中同时存在P-OP和P-OB键。所有这三种技术均表明，硼酸根和磷酸根单元之间的交联随氧化硼含量的增加而增加。特别地，在老化时，发现玻璃水解导致网络降解。同时，现在也观察到结晶相。 XRD和DTA表明样品在暴露于湿气中时随着氧化硼含量的增加而具有更高的结晶趋势。〜（31）P和〜（11）B MAS NMR结果与这些发现相符。 TGA数据表明，氧化硼含量较高的样品在老化时会吸收更多的水分，这表明结晶可能与玻璃水解有关。 HEXRD结果还表明，随着氧化硼含量的增加，钠离子优先与硼酸盐单元相关。

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