稀土掺杂硼铝硅酸盐玻璃形成和析晶性能

Thermal Stability of Boroaluminosilicate Glass with Rare Earth Doping

首先考察了稀土氧化物和氧化钡共掺入Al2O3-B2O3-SiO2玻璃的形成区范围、稀土氧化物掺入量对玻璃形成区的影响,然后利用差热分析手段分析了不同组分稀土氧化物对玻璃热稳定性的影响,最后采用XRD和TEM/EDS对在玻璃放热峰初始温度Tx附近热处理的玻璃样品进行了分析.结果表明,当稀土掺入量逐渐增加时,玻璃形成区范围先扩大后缩小.在Tx热处理温度附近,玻璃的失透主要由分相造成,稀土离子大量富集在富硼铝相中,热处理温度越高,玻璃的分相越明显;当继续在900℃下进行处理后,XRD谱图中出现了明显的析晶峰,通过分析比较认为主要析晶产物可能为类NdAl2.07(B4O10)O0.6结构的SmAl2.07(B4O10)O0.6晶体.

The glass-forming range of rare earth oxide and BaO co-doped Al2O3-B2O3-SiO2 system was explored, and the effect of the rare earth oxide content on glass-forming region was examined firstly. Then the effect of the rare earth oxides content on the glass thermo-stability was analyzed through differential thermal analysis technique. Finally, the glass after heat-treatment near Tx （the temperature at the beginning of exothermic peak formation） formation temperature was analyzed using XRD and TEM/EDS analyses. The results showed that the region of glass-forming range expanded firstly, and then shrank when the rare earth content increased gradually. The glass lacking of transparence after heat treatment near Tx was due to the phase separation, and the rare earth ions mainly distributed in the boron-aluminum rich phase, the higher the glass heat-treatment temperature, the more seriously the glass phase separation occurred. When the glass was heat-treated at a high temperature of 900℃, the diffraction peaks of crystal were very obvious in the XRD spectrum. Through comparing and analyzing, the main crystalline phase might be determined as SmAl2.07（B4O10）O0.6 with the same structure as NdAl2.07（B4O10）O0.6.