Analysis of Chemical and Phase Transformations during the Synthesis of Glass Ceramics based on Bismuth-Barium-Borate Glass and Er : YAG

An original combination of thermal activation with exposure to a strong non-uniform electric field transforms a multicomponent solution into a precursor. The transformation of an aerosol into a finished mixture eliminates the stage of gel formation, its lengthy drying and subsequent polluting grinding, providing the molecular level of mixing of various components inherent in the sol-gel method. Using the method of synchronous thermal analysis (STA), the phase, chemical and other thermal manifestations of 1) the bismuth-barium borate part of the charge (0.2Bi2O3-0.6B2O3-0.2BaO), 2) the charge of (Er0.5Y0.5)AG components, and 3) the charge precursor, which initially combines all the necessary components of glass-ceramics, were studied. The Gibbs energy minimization method was used to determine the conditions for the formation of crystalline phases of garnet and yttrium borate, identified by X-ray phase analysis (XRD) data in glass ceramic samples formed at different temperatures from an ultrafine charge.