摘要
在0.2<x<0.8的范围内,用传统方法合成的铈锆氧化物固溶体Ce1-xZrxO2通常由混合物构成。采用改进的高分子凝胶法在较低温度下合成了具有单相结构的Ce1-xZrxO2。该方法对于合成亚稳相的复合氧化物是独特而有效的。用X射线粉末衍射仪及透射电镜对粉末的结构和形貌进行分析测试。研究结果显示:产物的粒径在10～20nm之间;晶胞体积随x的增大呈线性减小;在固溶体的立方相结构中,Zr4+取代Ce4+进入晶格,晶格中还存在一定的应力。
The solid solution Ce_(1-x)Zr_(x)O_(2) synthesized by conventional methods, in the range of 0.2<x<0.8, is usually composed of mixed phases. A series of Ce_(1-x)Zr_(x)O_(2) (x = 0—0.8) with single phase structure were successfully prepared at lower temperature by a modified polymer-network gel process. This synthetic route is unique and effective for the synthesis of mixed metal oxides, particularly those with metastable phase structures. The phase structure, morphology and grain size of the powders were measured by means of X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results show that the mean grain size of the products is within 10—20 nm and the unit cell volume presents a linear contraction with the increase of x value. Ce^(4+) is substituted for Zr^(4+ )in the lattice site while some stress still remains in it in cubic structure of solid solution Ce_(1-x)Zr_xO_2.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2004年第4期502-506,共5页
Journal of The Chinese Ceramic Society
