Glass-ceramics (GC) were discovered by S. D. Stookey approximately 65 years ago.¹ GC research and technology can now be considered a mature field described by over 10,000 scientific articles and 5,000 patents, although many other GC may still be discovered, and a plethora of issues pertaining to their development and production remain to be solved.^1–4

Deubener et al.⁵ (2018) recently described GCs thus: “Glass-ceramics are inorganic, non-metallic materials prepared by controlled crystallization of glasses via different processing methods. They contain at least one type of functional crystalline phase and a residual glass. The volume fraction crystallized may vary from ppm to almost 100%.” GCs can be produced by sintering with concurrent surface crystallization of crushed glass powders or more traditionally by catalyzed internal crystallization of monolithic glass articles.^1–5