Lithium and sodium aluminosilicates are important glass‐forming systems for commercial glass‐ceramics, as well as being important model systems for ion transport in battery studies. In addition, uncontrolled crystallization of LiAlSiO₄ (eucryptite) in high‐Li₂O compositions, analogous to the more well‐known problem of NaAlSiO₄ (nepheline) crystallization, can cause concerns for long‐term chemical durability in nuclear waste glasses. To study the relationships between glass structure and crystallization, nine glasses were synthesized in the Li_xNa_1‐xAlSiO₄ series, from x = 0 to x = 1. Raman spectra, nuclear magnetic resonance (NMR) spectroscopy (Li‐7, Na‐23, Al‐27, Si‐29), and X‐ray diffraction were used to study the quenched and heat‐treated glasses. It was found that different LiAlSiO₄ and NaAlSiO₄ crystal phases crystallize from the glass depending on the Li/Na ratio. Raman and NMR spectra of quenched glasses suggest similar structures regardless of alkali substitution. Li‐7 and Na‐23 NMR spectra of the glass‐ceramics near the endmember compositions show evidence of several differentiable sites distinct from known Li_xNa_1‐xAlSiO₄ crystalline phases, suggesting that these measurements can reveal subtle chemical environment differences in mixed‐alkali systems, similar to what has been observed for zeolites.

中文翻译：

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沿霞石（NaAlSiO4）-锂霞石（LiAlSiO4）连接的玻璃中结晶的结构依赖性

铝硅酸锂和铝硅酸钠是用于商用玻璃陶瓷的重要玻璃成型系统，也是电池研究中离子迁移的重要模型系统。此外，与更广为人知的NaAlSiO ₄（霞石）结晶问题类似，高Li ₂ O成分中LiAlSiO ₄（锂霞石）的不受控制的结晶也会引起核废料玻璃的长期化学耐久性问题。为了研究玻璃结构与结晶之间的关系，从x = 0到x合成了9个Li _x Na _{1 x} AlSiO ₄系列玻璃。= 1.拉曼光谱，核磁共振（NMR）光谱（Li-7，Na-23，Al-27，Si-29）和X射线衍射用于研究淬火和热处理的玻璃。已经发现，取决于Li / Na比，不同的LiAlSiO ₄和NaAlSiO ₄晶相从玻璃中结晶出来。淬灭玻璃的拉曼光谱和NMR光谱表明类似的结构，而与碱取代无关。端部成分附近的玻璃陶瓷的Li-7和Na-23 NMR光谱显示了与已知的Li _x Na _{1‐ x} AlSiO ₄有所不同的几个可区分位点的证据 结晶相，表明这些测量结果可以揭示混合碱系统中细微的化学环境差异，类似于对沸石的观察结果。