Thermal history driven molecular structure transitions in alumino‐borosilicate glass,Journal of the American Ceramic Society

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Thermal history driven molecular structure transitions in alumino‐borosilicate glass
Journal of the American Ceramic Society ( IF 3.5 ) Pub Date : 2018-03-31 , DOI: 10.1111/jace.15553
Ji-Yeon Baek ₁ , Seung-Ho Shin ₂ , Seon-Hyo Kim ₁ , Jung-Wook Cho ₂

Affiliation

The glass network structure governs various thermos‐physical properties such as viscosity, thermal, and electrical conductivities, and crystallization kinetics. We investigated the effect of temperature on structural changes in a Na₂O‐CaO‐Al₂O₃‐SiO₂‐B₂O₃ glass system using ²⁷Al MAS NMR spectroscopy. Around the glass transition temperature, most of aluminate structures exist as AlO₄, acting as a glass former. When the temperature is above the melt crystallization temperature, the AlO₄ structure is drastically decreased and glass structures are mainly composed of AlO₅ and AlO₆, acting as glass modifiers. Thermodynamic assessment based on Gibbs energy minimization was used to confirm the dependency of aluminate structure's amphoteric characteristic on temperature by calculating the site fraction of aluminate molecular structures at different temperatures. Temperature‐induced aluminate structural variation can also influence silicate and borate structural changes, which have been confirmed by the ²⁹Si and ¹¹B NMR spectra.

中文翻译：

热历史驱动铝硼硅酸盐玻璃中的分子结构转变

玻璃网络结构控制着各种热物理性质，例如粘度，热和电导率以及结晶动力学。我们使用²⁷ Al MAS NMR光谱研究了温度对Na ₂ O-CaO-Al ₂ O ₃ -SiO ₂ -B ₂ O ₃玻璃系统中结构变化的影响。在玻璃化转变温度附近，大多数铝酸盐结构以AlO _4的形式存在，起着玻璃形成剂的作用。当温度高于熔融结晶温度时，AlO ₄结构急剧下降，玻璃结构主要由AlO ₅和AlO组成₆，用作玻璃改性剂。通过计算不同温度下铝酸盐分子结构的位点分数，采用基于吉布斯能量最小化的热力学评估方法确定铝酸盐结构两性特征对温度的依赖性。温度引起的铝酸盐结构变化也会影响硅酸盐和硼酸盐的结构变化，这一点已通过²⁹ Si和¹¹ B NMR光谱得到证实。

更新日期：2018-03-31

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