Alkali and alkaline earth zinc and lead borate glasses: Sintering and crystallization

Q1 Physics and Astronomy Journal of Non-Crystalline Solids: X Pub Date : 2022-09-01 DOI:10.1016/j.nocx.2022.100116

Lina Heuser, Marianne Nofz, Ralf Müller

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引用次数: 1

Abstract

Glasses in the systems Me₂O-ZnO-B₂O₃ with Me = Li, Na, K, Rb (MeZB), Na₂O-ZnO-CuO-B₂O₃ (NZCuB), CaO-ZnO-B₂O₃ (CaZB), and Li₂O-PbO-B₂O₃ (LPbB) as a reference, were studied by differential thermal analysis, dilatometry, rotational viscometry, and heating microscopy. A decrease of viscosity and sintering range was found with decreasing number of fourfold coordinated boron. The viscosity of the alkali zinc borate glasses varies only slightly. LPbB and CaZB stand out by their reduced and increased viscosities, respectively. Sodium, potassium, and calcium zinc borate glasses possess a fragility above 76. All glasses were sintered to full density before crystallization. Mostly binary zinc borate phases govern crystallization. A ternary crystalline phase was detected only in the potassium containing sample. The Weinberg glass stability parameter ranges between 0.07 and 0.12. This is caused by the presence of several crystalline phases and varying melting points of even the same crystalline phase in different glass matrices.

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碱和碱土硼酸锌铅玻璃:烧结和结晶

以Me = Li、Na、K、Rb (MeZB)、na20 - zno - cuo - b2o3 (NZCuB)、CaO-ZnO-B2O3 (CaZB)和li20 - pbo - b2o3 (LPbB)体系为参照，采用差热分析、膨胀法、旋转粘度法和加热显微镜研究了me20 - zno - b2o3体系中的玻璃。随着四重配位硼数量的减少，黏度和烧结范围减小。碱硼酸锌玻璃的粘度变化不大。lbb和CaZB分别以降低和增加粘度而脱颖而出。钠、钾和钙锌硼酸盐玻璃的脆性在76以上。所有的玻璃在结晶前都被烧结到满密度。主要由硼酸锌二元相控制结晶。三元晶相仅在含钾样品中检测到。温伯格玻璃的稳定性参数在0.07 ~ 0.12之间。这是由于在不同的玻璃基质中存在不同的结晶相和不同的熔点造成的，即使是同一结晶相。

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