Hot pressing preparation of Y2Ti2O7-based glass-ceramics as potential waste forms for actinide immobilization

A series of Y2Ti2O7 glass-ceramic which is the main crystal phase is pyrochlore for actinide immobilization were synthesized by a new method combining oxide pre-crystallization and hot pressing. Y2Ti2O7 was evenly distributed in the glass medium, increasing the temperature promoted the rapid growth of Y2Ti2O7 grains, and increasing the pressure was conducive to maintaining the uniformity of Y2Ti2O7 grains. Driven by a pressure, the glass component filled the gap well between the Y2Ti2O7 grains, and the glass-ceramic obtained a compactness close to the theoretical density, so that it had an excellent microstructure and served the immobilization of actinide better.