Spinodal Decomposition in a K2O‐Al2O3‐CaO‐SiO2 Glass

Abstract
Diffuse interfaces are observed in the interconnected structure of a phase‐separated K2O‐Al2O3‐CaO‐SiO2 glass. With continued electron irradiation in the scanning transmission electron microscope, the interfaces are observed to sharpen with little attendant change in phase morphology, indicating that the as‐cooled microstructure is formed through spinodal decomposition.