Effect of Cation Field Strength on Structure and High-temperature Properties of BaO-SiO2-Ln2O3 Glass-ceramic
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Abstract
阳离子场强对 BaO-SiO 2 -Ln 2 O 3 微晶玻璃 结构及高温性能影响 杨艳国 1,2 , 任海深 1 , 何代华 2 , 林慧兴 1,2 (1.中国科学院 上海硅酸盐研究所, 上海 200050; 2. 上海理工大学 材料与化学学院, 上海 200093) 摘 要: SiO 2 -BaO 基微晶玻璃以其膨胀系数高、耐高性能优异而成为耐高密封领域研究的热点, 但稀土氧化物对该 类封接玻璃改性的影响研究尚不多见。本工作研究不同高阳离子场强(Cation field strength, CFS)的稀土氧化物取代 传统碱土氧化物 BaO 对新型富稀土-SiO 2 -BaO-Ln 2 O 3 (SBLn, Ln=La、Sm、Er、Yb)系列玻璃的网络结构、结晶行 为、微观结构和高温性能的影响。随着稀土阳离子场强由 2.82(La 3+ )增大到 3.98(Yb 3+ ), SBLn 玻璃的玻璃转变温度 (T g )、析晶起始温度(T x )、析晶峰值温度(T p )均逐渐增加, 说明高稀土阳离子场强有利于提高 SBLn 玻璃的热稳定性。 四类富稀土 SBLn 玻璃的结晶相均由 BaSiO 3 和 BaSi 2 O 5 相组成, 随稀土阳离子场强增大, BaSiO 3 相减少、BaSi 2 O 5 相增多, 稀土元素只存在于玻璃相中, 不参与晶相析出。随着稀土阳离子场强增加, SBLn 微晶玻璃的热膨胀系数 (Coefficient of thermal expansion, CTE)由 12.52×10
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Research context
OpenAlex topics: Nuclear materials and radiation effects · Microwave Dielectric Ceramics Synthesis · Advancements in Solid Oxide Fuel Cells
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