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Composition-structure-property relationships in boroaluminosilicate glasses

机译:硼铝硅酸盐玻璃的组成-结构-性质关系

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摘要

The complicated structural speciation in boroaluminosilicate glasses leads to a mixed network former effect yielding nonlinear variation in many macroscopic properties as a function of chemical composition. Here we study the composition-structure-property relationships in a series of sodium boroaluminosilicate glasses from peralkaline to peraluminous compositions by substituting Al _2O _3 for SiO _2. Our results reveal a pronounced change in all the measured physical properties (density, elastic moduli, hardness, glass transition temperature, and liquid fragility) around [Al _2O _3]-[Na _2O] = 0. The structural origin of this change is elucidated through nuclear magnetic resonance analyses and topological considerations. Furthermore, we find that addition of 1 mol% Fe _2O _3 exerts a complicated impact on the measured properties.
机译:硼铝硅酸盐玻璃中复杂的结构形态导致混合网络形成效应,从而产生许多宏观性质随化学成分变化的非线性变化。在这里,我们用Al _2O _3代替SiO _2研究了一系列从高碱性到高铝成分的硼铝硅酸钠玻璃的组成-结构-性能关系。我们的结果表明,在[Al _2O _3]-[Na _2O] = 0周围,所有测得的物理性质(密度,弹性模量,硬度,玻璃化转变温度和液体脆性)都有明显变化。阐明了这种变化的结构来源通过核磁共振分析和拓扑考虑。此外,我们发现添加1 mol%的Fe _2O _3对测量的性能产生复杂的影响。

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