ABSTRACT The effect of BaO on the structure and properties of bismuth-based low-melting sealing glasses (Bi2O3–B2O3–ZnO–SiO2–Al2O3–BaO) were investigated by FTIR, 27Al NMR and DSC. The results showed that when BaO content was less than or equal to 3 wt-%, BaO provided (O2–) free oxide ions, which made [AlO6] transform into [AlO4] and made [BO3] transform into [BO4]. The increase of [AlO4] and [BO4] enhanced the network structure and decreased the thermal expansion coefficient of glass-ceramic. But when BaO was more than 3 wt-%, a large amount of Ba2+ , considered as an external body of network, entered the gap of glass network and weakened the existing bridge oxygen vibration in the glass structure and increased the thermal expansion coefficient. Besides, the crystallisation ability of glasses would be promoted by increasing the heat treatment temperature or the BaO content. The formation of BaAl2Si2O8 crystal would improve the acidity resistance of the glass-ceramic to a certain extent.

中文翻译：

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BaO对铋基低熔点玻璃结构和性能的影响

摘要 通过 FTIR、27Al NMR 和 DSC 研究了 BaO 对铋基低熔点密封玻璃 (Bi2O3–B2O3–ZnO–SiO2–Al2O3–BaO) 结构和性能的影响。结果表明，当BaO含量小于或等于3wt-%时，BaO提供(O2-)游离氧离子，使[AlO6]转化为[AlO4]，使[BO3]转化为[BO4]。[AlO4]和[BO4]的增加增强了微晶玻璃的网络结构并降低了热膨胀系数。但当 BaO 含量超过 3 wt-% 时，大量被视为网络外部体的 Ba2+ 进入玻璃网络间隙，削弱了玻璃结构中现有的桥氧振动，增加了热膨胀系数。除了，提高热处理温度或提高 BaO 含量可以提高玻璃的结晶能力。BaAl2Si2O8晶体的形成在一定程度上提高了微晶玻璃的耐酸性。