Influence of ion exchange on liquid–liquid phase separation in alkali borosilicate glasses: effect of ion-exchange-induced metastable glass homogenization

• Published in: Journal of non-crystalline solids Vol. 270; no. 1; pp. 154 - 162
• Main Authors: Karapetyan, G.O., Loboda, V.V., Tagantsev, D.K.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.05.2000; Elsevier
• Subjects: Condensed matter: structure, mechanical and thermal properties; Equations of state, phase equilibria, and phase transitions; Exact sciences and technology; Physics; Solubility, segregation, and mixing; phase separation; I210; A140; P120; Inorganic compounds; Metastable phases; Quaternary systems; Phase separation; Liquid phase; Ion exchange; Experimental study; Borosilicate glass; Lithium compounds; Sodium compounds
• ISSN: 0022-3093; 1873-4812
• DOI: 10.1016/S0022-3093(00)00069-7

Experimental results of studying the metastable liquid–liquid phase separation and homogenization induced by ion exchange in (15- x)Li 2O · xNa 2O · 35B 2O 3 · 50SiO 2 glass-forming system are presented. Both a homogeneous under-surface layer in a phase-separated glass and a phase-separated under-surface layer in a homogeneous glass have been formed by an ion exchange technique. The Li-for-Na ion exchange in the glass with x=15 led to phase-separated layers while the Na-for-Li ion exchange in the phase-separated glass with x=5 led to the homogeneous vitreous layers. These effects and the conditions that produce them are discussed from the viewpoint of phase equilibria in the system involved.