摘要
采用改进的高分子凝胶法在较低温度下合成了铈锆氧化物固溶体Ce1-xZrxO2.当0≤x≤0.6时,固溶体为立方相结构;当0.7≤x≤0.9时,固溶体具有四方相结构;当x=1.0时,产物由四方相和单斜相组成.透射电镜分析结果显示,产物的粒径在10～20nm之间;粉末X射线衍射(XRD)实验与计算结果表明,晶胞体积随x的增大呈线性减小;差示扫描量热法(DSC)和XRD测试结果说明,在0≤x≤0.9,温度为323～1273K的范围时,产物的相结构保持不变.
The solid solution Ce_(1-x)Zr_xO_2 were successfully synthesized by a modified polymer-network gel process at low temperature. In the ranges of 0≤x≤0.6 and 0.7≤x≤0.9, the solid solutions posses a cubic and a tetragonal phase structure respectively. As for x=1.0, the product is composed of tetragonal and monoclinic phases. The analysis with transmission electron microscopy (TEM) shows that the mean grain size of the solid solutions is within 10-20 nm. The calculated results indicate that the unit cell volume present a linear contraction with the increase of Zr contents. It can be inferred from the results of differential scanning calorimetry (DSC) and XRD that within the scope of 0≤x≤0.9, the crystal symmetry of Ce_(1-x)Zr_xO_2 remains stable between 323 K and 1 273 K.
出处
《北京理工大学学报》
EI
CAS
CSCD
北大核心
2005年第1期82-86,共5页
Transactions of Beijing Institute of Technology
基金
国家"八六三"计划项目(2002AA245091)
关键词
氧化铈
氧化锆
储氧材料
高分子凝胶法
ceria
zirconia
oxygen storage material
polymer-network gel
