Copper ⇌ Alkali Ion Exchange of Alkali Aluminosillcate Glasses in Copper‐Containing Molten Salt: I, Monovalent Copper Salt, CuCl

Cu+⇌ R+ (R = Li, Na, and K) ion exchange experiments were conducted for 20R2O·10Al2O3·70SiO2 glasses in molten CuCl at 550°C in air and nitrogen atmospheres. The depth profiles of the copper incorporated into glasses were determined with an electron microprobe X-ray analyzer. The total amount of diffusing copper, Mt, strongly depended on the type of alkali ion in the glass and the ion-exchange atmosphere; i.e., Mt increased with increasing cationic size in the order Li < Na < K and Mt was greater in air than in nitrogen. The Cu ⇌ R+ ion exchange kinetics are discussed in detail.

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