Structural Response of Lithium Disilicate in Glass Crystallization

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• 作者：Saifang Huang ; Zhaohui Huang ; Wei Gao ; Peng Cao
• 刊名：Crystal Growth & Design
• 出版年：2014
• 出版时间：October 1, 2014
• 年：2014
• 卷：14
• 期：10
• 页码：5144-5151
• 全文大小：640K
• ISSN：1528-7505

文摘

The Li₂O路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 crystallographic approach for analyzing the intrinsic mechanisms of reaction, nucleation, or crystallization in systems involving crystalline phases.