Structural Response of Lithium Disilicate in Glass Crystallization

The Li2O·SiO2 related glass systems have attracted extensive theoretical and experimental investigations for several decades. There are three different crystallization sequences commonly reported in lithium disilicate glasses although their contributing factors are unclear. Moreover, the effect of concurrent precipitation of crystalline phases during glass crystallization is rarely reported from a microscopic perspective. In this work, we observed the structural response of lithium disilicate (Li2Si2O5) to other crystalline phases, as probed in different types of lithium disilicate glasses by in situ synchrotron X-ray powder diffraction. The evolution of crystallographic structure of Li2Si2O5 along its c axis showed a silica-controlled fashion, viz., its evolution trend reverses whenever a crystalline silica phase precipitates. Besides, the evolution characteristics of the c axis of Li2Si2O5 at the nucleation stage differ if the crystallization sequence changes. These findings may initiate a novel crystal...

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