Reduction‐Induced Inward Diffusion and Crystal Growth on the Surfaces of Iron‐Bearing Silicate Glasses |
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| Authors: | Shujiang Liu Haizheng Tao Yanfei Zhang Yuanzheng Yue |
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| Affiliation: | 1. Key Laboratory of Processing and Testing Technology of Glass & Functional Ceramics of Shandong Province, Qilu University of Technology, Jinan, China;2. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Hubei, China |
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| Abstract: | We investigate the sodium inward diffusion (i.e., sodium diffusion from surface toward interior) in iron containing alkaline‐earth silicate glasses under reducing conditions around Tg and the induced surface crystallization. The surface crystallization is caused by formation of a silicate‐gel layer first and then the growth of silica crystals on the glass surface. The type of alkaline‐earth cations has a strong impact on both the glass transition and the surface crystallization. In the Mg‐containing glass, a quartz layer forms on the glass surface. This could be attributed to the fact that Mg2+ ions have stronger bonds to oxygen and lower coordination number (4–5) than Ca2+, Sr2+, and Ba2+ ions. In contrast, a cristobalite layer forms in Ca‐, Sr‐, and Ba‐containing glasses. |
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