Abstract
Abstract Utilizing the difference in the size of the immiscibility regions with alkali ions, phase separation was induced at the surface of 70SiO2·15B2O3·15Na2O (mol %) glass by ion exchange in which Na+ ions were replaced by Li+ ions in molten LiNO3 salt at 400 °C. The heat treatment after the ion exchange made the phase separation proceed and formed phases which can be dissolved by acid treatment. Through the ion-exchange-induced phase separation, we prepared monolithic glasses, in which only the surface region is porous and the rest is homogeneous and transparent.
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