玻璃生产工艺及深加工玻璃制品简介

玻璃一般是由石英砂、纯碱、长石、石灰石等为主要原料经熔溶成形，冷却，固化而成的非晶体无机材料。按其化学成份分为：硅酸盐玻璃、磷酸盐玻璃、硼酸盐玻璃、铝酸盐玻璃等，最为常用的是硅酸盐玻璃。主要是由硅酸盐矿物、氧化物等经加热、熔融、冷却而形成的一种无定形的固态材料。     

Luminescence enhancement of BaMgSiO4：Eu^2＋ by adding borate as flux

The luminescence of EU^2＋ in BaMgSiO4 with BaB2O4 as flux was studied. The emission spectrum of the phosphor consisted of two bands, peaking at about 398 nm and 515 nm, which were attributed to the emissions from different Eu^2＋ sites in the lattice. When the BaB2O4 flux was applied, the intensity of the 398 nm emission was not clearly affected, but the intensity of the 515 nm emission was enhanced by about ten times. Gaussian fitting showed that the emission band at around 515 nm could actually be resolved into two bands with peak wavelengths of 499 nm and 521 nm, respectively. The assignments of the emission bands to the cation sites were carried out according to the values of bond valence. The overlapping of the 398 nm emission band on the excitation band of 515 nm emission implied that energy transfer could occur from the luminescent center related to the 398 nm emission to the center related to the 515 nm emission, and the energy transfer process remarkably enhanced the intensity of the 515 nm emission band. The phosphor had strong excitation at around 350-400 nm and emitted a bright green luminescence. Thus it could have applications as a green component in solid-state lighting devices assembled by near-UV Light Emitting Diodes （LED） combined with tricolor phosphors.     

多金属硼酸盐的研究进展

多金属硼酸盐一直是材料化学家关注的热点领域.从多金属硼酸盐的阳离子的归属进行了分类,综述了多金属硼酸盐的研究情况,同时对多金属硼酸盐的研究进行了展望.     

离子液体在Phosphor—aldol反应中的应用

主要介绍1-丁基-3-甲基咪唑氟硼酸盐离子液体作为反应溶剂,用于Phosphor-aldol反应.与有机溶剂作介质的反应条件相比,离子液体中的反应条件相对温和,一般情况下反应可在常温、常压下进行,在反应速率、转化率和选择性上与有机溶剂相近.同时,离子液体能循环利用,节约了资源,倡导了绿色化学的理念.     

Effect of Nd~(3+) on spectroscopic properties of lithium borate glasses

The spectroscopic properties of lithium borate glasses as a function of Nd3＋ ions concentration were reported.Optical absorption spectra of these glasses showed a number of absorption bands in ultra violet and visible region.Optical absorption edge was found to shift towards the longer wavelength（red shift） with increase in Nd2O3.Luminescence spectra revealed three major bands at 902, 1063 and 1334 nm which was due to 4F3/2→4I9/2, 11/2 ＆13/2 transitions of Nd3＋ ions.Luminescence intensity was maximum for 1 mol.% Nd2O3 and further increase in Nd2O3 resulted in luminescence quenching.The luminescence quenching behavior at higher concentration of Nd2O3 was attributed to the Nd3＋-Nd3＋ interaction in the glass matrix.An absorption and emission property of these glasses suggested that these glasses could be useful for 1.06 μm infrared laser applications.     

硼酸盐活化效应对碳酸钾溶液吸收CO_2的影响

活化碳酸钾溶液吸收法是实现燃煤电厂烟气中CO2大规模捕集的颇具潜力的减排技术之一。文中采用停流光谱–pH指示剂技术和气液接触式湿壁柱实验装置考察了硼酸盐对CO2水合的活化效应及其对碳酸钾溶液吸收CO2的影响。研究结果表明:硼酸盐可以活化CO2转化为HCO3?,其活化机制类似于碳酸酐酶催化CO2水合机制;在碳酸钾溶液中加入硼酸盐可以明显提高CO2在溶液中的富集速率和吸收过程的增强因子。考虑离子强度的影响,在液膜控制条件下,文中建立的基于液相硼活化机制的模型可以很好的预测硼酸盐活化的碳酸钾法对CO2的实际吸收效果,为工艺过程设计和操作条件优化提供借鉴参考。     

Na_3Ba_2B_6O_(12)F晶体的生长及电子结构计算

在Ba_2B_5O_9Cl-NaF体系中,采用高温溶液法生长出了尺寸为7mm×5mm×3mm的透明Na_3Ba_2B_6O_(12)F晶体,并对其进行了X射线衍射(XRD)图谱和红外光谱分析;晶体的电子能带结构和态密度的理论计算结果说明Na_3Ba_2B_6O_(12)F化合物的间接带隙大小为4.646eV,吸收系数计算结果表明其紫外吸收边为4.654eV。