Ion‐exchangeable, transparent spinel glass‐ceramics are presented and discussed here for the first time. To retain transparency with increasing crystallinity, spinel glass‐ceramics must have uniform crystallization of small (~9 nm) crystallites, not large spherulitic structures comprised of small crystallites. To obtain such a uniform microstructure, the amount of total nucleating agents (ZrO₂ + TiO₂) in the precursor glass composition must be greater than 5 mol%. With small changes in composition and significant differences in microstructure, the demarcation between transparent and opaque glass‐ceramics is distinct as is the decrease in K diffusivity during ion‐exchange from the transparent (14.7 microns²/h) to the opaque (11.2 microns²/h) compositions. Understanding how to retain transparency during ceramming and increase diffusivity during chemical strengthening is critical in designing materials for many real‐world applications.

中文翻译：

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组成和微观结构对离子交换尖晶石玻璃陶瓷透明性和扩散性的影响

首次在此展示和讨论离子可交换的透明尖晶石玻璃陶瓷。为了在增加结晶度的同时保持透明度，尖晶石玻璃陶瓷必须具有均匀的小（〜9 nm）微晶结晶，而不是由小微晶构成的大球形结构。为了获得这种均匀的微观结构，前体玻璃组合物中总成核剂（ZrO ₂  + TiO ₂）的量必须大于5mol％。由于成分的微小变化和微观结构的显着差异，透明和不透明玻璃陶瓷之间的分界是明显的，从透明（14.7微米² / h）到不透明（11.2微米²）的离子交换过程中K扩散系数的降低也很明显。/ h）组成。在设计用于许多实际应用的材料时，了解在陶瓷化过程中如何保持透明性以及在化学强化过程中​​如何提高扩散性至关重要。