In2O3-10SnO2陶瓷中In4Sn3O12与富Sn析出相特征

摘要

ITO ceramics were prepared using co-precipitation powders which contained 10% SnO2.The samples were sintered at 1600℃for different time in oxygen atmosphere. The phase composition, element distribution and microstructure of ceramics were studied by XRD, EPMA, TEM and SEM. The results show that nanosized Sn-rich phase with body-centered cubic structure precipitatesin In2O3:Sn grains. Meanwhile, In4Sn3O12grains form at triple junctions of In2O3:Sn grains, and precipitate-free zones appear around In2O3:Sn grain boundaries. The sizes and distancesof Sn-rich precipitates in In2O3:Sn grains decrease gradually from grain center to grain boundary. Furthermore, the sizes of In4Sn3O12grains and Sn-rich precipitates as well as the width of precipitate-free zones increase with extension of the holding time.%以SnO2质量分数为10%的共沉淀ITO粉为原料，在1600℃氧气氛下烧结制备ITO陶瓷，采用X线衍射、电子探针、透射电子显微镜、扫描电子显微镜对其物相组成、元素分布和微观结构进行研究。研究结果表明：在In2O3：Sn晶粒内析出纳米尺寸的体心立方结构的富Sn相，晶粒边缘内侧出现低Sn浓度的无析出带，其三晶交界处生成In4Sn3O12晶粒；In2O3：Sn晶内富Sn析出相按照从晶粒中部到晶界边缘尺寸逐渐减小、排布由疏到密的的规律分布；随着保温时间的延长，In4Sn3O12晶粒尺寸、In2O3：Sn晶内的富Sn析出相尺寸和无析出带宽度增大。