Vitrification's a process of converting a material into a glass-like amorphous solid that's free from any crystalline structure, either by the quick removal or addition of heat, or by mixing with an additive. Solidification of a vitreous solid occurs at the glass transition temperature (which's lower than melting temperature, Tm, due to supercooling). When the starting material's solid, vitrification usually involves heating the substances to very high temperatures. Many ceramics are produced in… (More on Vitrification)