Na_2O-B_2O_3-SiO_2-SnO_2系统的分相与析晶  

Phase Separation and Crystallization of Na_2O-B_2O_3-SiO_2-SnO_2 System

作　　者：张文丽[1] 金建国[1] 张晓丽[1] 

机构地区：[1]河北理工大学材料学院

出　　处：《无机材料学报》2005年第1期205-209,共5页Journal of Inorganic Materials

基　　金：河北省自然科学基金(502270)

摘　　要：对Na2O-B2O3-SiO2-SnO2四元系统的分相与析晶进行了探讨.通过对不同组成点在热处理、化学处理各阶段的试样进行能谱分析、XRD分析及SEM分析,确认了SnO2分布在分相结构中的富硼碱相中;在该系统中SnO2晶体的析出有赖于分相过程;分相结构尺度限制了SnO2的析晶尺寸.试验结果表明,通过控制分相结构得到了负载于多孔富硅载体的纳米尺寸的SnO2材料.该材料具有较高的CO氧化催化活性。Phase separation and crystallization of Na2O-B2O3-SiO2-SnO2 system were discussed. Samples of different component points in every stage of thermal treatment and chemistry dealing were analysed by EDAX, XRD and SEM. The results show that SnO2 distributes in boron-alkali-rich phase separation area; the growth of SnO2 crystal in the system depends on phase separation process; the crystallization size of SnO2 is restrained by the scale of the phase separation structure. The nanometer-SnO2 material, loaded on silicon-rich porous carrier, can be obtained by controlling phase separation structure. This material has a good ability in CO catalyst activity.

关 键 词：Na2O-B2O3-SiO2-SnO2系 纳米SNO2 析晶 分相 

分 类 号：TQ174[化学工程—陶瓷工业]