The effect of the average ionic potential ξ = Ze/r of the network modifier cations on crack initiation resistance (CR) and Young's modulus E has been measured for a series of alkaline‐earth aluminoborosilicate glasses with the compositions 60SiO₂–10Al₂O₃–10B₂O₃–(20−x)M₍₂₎O–xM’O (0 ≤ x ≤ 20; M, M’ = Mg, Ca, Sr, Ba, Na). Systematic trends indicating an increase of CR with increasing ionic potential, ξ, have been correlated with structural properties deduced from the NMR interaction parameters in ²⁹Si, ²⁷Al, ²³Na, and ¹¹B solid state NMR. ²⁷Al NMR spectra indicate that the aluminum atoms in these glasses are essentially all four‐coordinated, however, the average quadrupolar coupling constant <C_Q> extracted from lineshape analysis increases linearly with increasing average ion potential computed from the cation composition. A similar linear correlation is observed for the average ²⁹Si chemical shift, whereas the fraction of four‐coordinate boron decreases linearly with increasing ξ. Altogether the results indicate that in pure alkaline‐earth boroaluminosilicate glasses the crack resistance/E‐modulus trade‐off can be tailored by the alkaline‐earth oxide inventory. In contrast, the situation looks more complicated in glasses containing both Na₂O and the alkaline‐earth oxides MgO, CaO, SrO, and BaO. For 60SiO₂–10Al₂O₃–10B₂O₃–10MgO–10Na₂O glass, the NMR parameters, interpreted in the context of their correlations with ionic potentials, are consistent with a partial network former role of the MgO component, enhancing crack resistance. Altogether the presence of MgO in aluminoborosilicate glasses helps overcome the trade‐off issue between high crack resistance and high elasticity modulus present in borosilicate glasses, thereby offering additional opportunities for the design of glasses that are both very rigid and very crack resistant.

中文翻译：

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固体核磁共振研究耐裂纹碱土铝硼硅酸盐玻璃的结构性质关系

对于一系列组成为60SiO ₂ –10Al ₂ O ₃的碱土铝硼硅酸盐玻璃，已经测量了网络改性剂阳离子的平均离子电势ξ  =  Ze / r对抗裂纹萌生性（CR）和杨氏模量E的影响。 -10B ₂ ö ₃ - （20- X）M _（2） O- X M'O（0≤  X  ≤20; M，M” =镁，钙，锶，钡，钠）。系统趋势表明CR升高离子电势ξ的增加与²⁹ Si，²⁷ Al，²³ Na和¹¹ B固态NMR中NMR相互作用参数推导的结构性质相关。²⁷ Al NMR光谱表明，这些玻璃中的铝原子基本上都是四配位的，但是，从线形分析中提取的平均四极耦合常数<C _Q >随着从阳离子组成计算的平均离子电势的增加而线性增加。对于平均²⁹ Si化学位移，观察到相似的线性相关性，而四坐标硼的分数随ξ的增加呈线性下降。总的来说，结果表明，在纯碱土金属硼铝硅酸盐玻璃中，抗裂性/ E模量的折衷可以通过碱土金属氧化物库存量来调整。相反，在同时含有Na ₂ O和碱土金属氧化物MgO，CaO，SrO和BaO的玻璃中，情况看起来更加复杂。适用于60SiO ₂ –10Al ₂ O ₃ –10B ₂ O ₃ –10MgO–10Na ₂在玻璃中，NMR参数在其与离子电势的相关性上下文中得以解释，与MgO组分的部分网络形成者作用相一致，从而提高了抗裂性。铝硼硅酸盐玻璃中总共存在MgO有助于克服硼硅酸盐玻璃中高抗裂性和高弹性模量之间的权衡问题，从而为设计既刚性又抗裂性高的玻璃提供了更多机会。