玻璃反应烧结制备NZP微晶玻璃中钨的作用及高温X射线衍射研究

TUNGSTEN INFLUENCE AND HIGH TEMPERATURE X-RAY DIFFRACTION STUDY OF GLASS REACTION SINTERING OF NZP GLASS CERAMIC

NZP型晶体结构由于使用了其它大量的金属离子替代结构中的金属离子,因而具有了热膨胀的可调性和离子导电性。然而,因制备过程中需要保持高温很长时间,所以NZP很难制备出整块材料。针对磷酸盐玻璃使用玻璃反应烧结工艺,在一种低温替代路线中获得含有钨、锡的NZP结晶相。使用微波加热以及传统的熔炼和铸造技术,制备了一种含有适量NaPO3-SnO-WO3化合物的玻璃。用绿色的弹丸在烧结反应温度下分别经历不同的时间段进行固化,然后通过射线衍射(XRD)和差热(DTA)分析。结果显示氧化钨必须与SnO具有相同的比例才能获得不含有任何次晶相的纯NZP相。

NZP crystal structure has the adjustability of thermal expansion and ionic conductivity due to the use of a large number of other metal ions instead of metal ions in the structure.However,NZP is difficult to prepare monolithic materials because of the need to keep high temperature for a long time.In this paper,the glass reaction sintering process is used to obtain the crystalline phase of NZP containing W and Sn in a low temperature alternative route.A kind of glass containing appropriate amount of NaPO3-SnO-WO3 compound is prepared by microwave heating and traditional melting and casting technology.The green pellets are solidified in different time periods at sintering reaction temperature,and then analyzed by XRD and DTA.The results show that tungsten oxide should have the same proportion with SnO to obtain pure NZP phase without any sub crystal phase.