Effect of B2O3 on Structure and Properties of CaO–MgO–B2O3–Al2O3–SiO2 Glasses
Effect of B2O3 on Structure and Properties of CaO–MgO–B2O3–Al2O3–SiO2 Glasses
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DOI：
10.1007/s10904-015-0164-y
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发表时间：
2015-01
影响因子：
4
通讯作者：
Sanxi Huang;Sheng Li;Fengnian Wu;Y. Yue
中科院分区：
文献类型：
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作者：
Sanxi Huang;Sheng Li;Fengnian Wu;Y. Yue
通过熔融-淬冷法在1,450 ℃下3小时制备x在5-30摩尔%之间的各种x的xB 2 O 3-（1-x）（60 SiO 2 - 15 Al 2 O 3 - 15 MgO-10 CaO）玻璃。红外光谱数据表明，用B2 O3取代其它组分，使[BO 4]四面体和硼氧环的数量增加，[AlO 4]四面体的数量逐渐减少。当B2 O3的浓度较低（≤20 mol%）时，玻璃化转变温度（Tg）、晶化温度（Tc）和热稳定性（Tg T）升高，玻璃网络结构增强。然而，进一步增加B_2O_3的浓度（> 20mol%）会降低Tg、Tc和Tg。利用梯度升温炉对G6玻璃进行了测试，并通过偏光显微镜观察了重熔样品和晶化相的显微结构破坏情况。随着B2 O3含量的增加，介电常数（εr）和损耗（tanδ）福尔斯降低，这与阳离子极化率和浓度的降低有关，沿着玻璃网络刚性增加。
xB2O3-(1 − x) (60SiO2–15Al2O3–15MgO–10CaO) glasses with various x around 5–30 mol% at the step of 5 mol% are prepared by the melting-quenching method at 1,450 °C for 3 h. The IR data indicate that replacing other components by B2O3levels up the amount of [BO4] tetrahedron and boron-oxygen rings, forcing [AlO4] tetrahedron to drop gradually. The glass transition temperature (Tg), crystallization temperature (Tc) and thermal stability (∆T) rise when B2O3is present in lower concentrations (≤20 mol%); accordingly the glass network enhances. However, further increase in concentration of B2O3(>20 mol%) reduces the Tg, Tcand ∆T. We utilize temperature-gradient furnace to measure the G6 glass, while the re-melt sample and crystallized phase are observed from polarizing microscope destroying microstructure. As B2O3content move up, falls in dielectric constant (εr) and loss (tanδ) can be associated with drop of cations polarizability as well as concentration, along with glass network rigidity ascending.