摘要
为了研究和表征氧化锆固溶粉体的本征特性,利用化学共沉淀方法制备一系列ZrO2-TiO2-Y2O3三元体系的固溶体纳米粉。通过X射线衍射、透射电镜分析和比表面积测量确定固溶粉体为单一四方相结构,晶粒尺寸在10~25nm。固溶纳米粉体随TiO2固溶量增加,晶格常数中a值下降,c值上升,c/a值呈上升趋势。由于纳米粉体表面效应的不饱和性,可使t-ZrO2纳米粉中固溶摩尔分数为40%的TiO2,烧结后,固溶掺杂的摩尔分数为20%TiO2的瓷体中已出现ZrTiO4相。
The properties of zirconia solid solution powders were characterized with a series of ZrO2TiO2Y2O3 nanosized powders synthesized by chemical coprecipitation. XRD (XRay Diffraction) showed that powders were tetragonal solid solutions. The average particle size was 10~25 nm as determined by TEM (Transmission Electron Microscope) and BET specific surface area measurements. With increasing TiO2 content, the lattice parameter a decreased while c increased and as a result, c/a increased. The molar fraction x of TiO2 in tZrO2 was up to 40%, because of the surface effect in the nanosized powders. The ZrTiO4 phase was observed in the ceramic materials after sintering for a solid solution x(TiO2) content of 20%.
出处
《清华大学学报(自然科学版)》
EI
CAS
CSCD
北大核心
2003年第6期758-761,共4页
Journal of Tsinghua University(Science and Technology)
基金
国家自然科学基金资助项目(59972014)