Ce_(1-x)Gd_xO_(2-x/2)的溶胶-凝胶法合成及其性质  

Sol-gel Synthesis and Properties of Ce_(1-x)Gd_xO_(2-x/2) Solid Solutions

作　　者：蒋凯[1] 彭程[1] 李五聚[1] 王琳[2] 王鸿燕[2] 梁宏伟[2] 孟健[2] 

机构地区：[1]河南师范大学化学与环境科学学院,河南省高等学校环境科学与工程重点实验室,新乡453002 [2]中国科学院长春应用化学研究所稀土化学与物理开放实验室,长春130022

出　　处：《高等学校化学学报》2001年第8期1279-1282,共4页Chemical Journal of Chinese Universities

基　　金：国家重点基础研究发展规划项目 (批准号 :GB19980 6 1316 );国家自然科学基金 (批准号 :2 98310 10 ;5 980 2 0 11);河南省杰出青年基金;河南省自然科学基金 (批准号 :0 0 40 30 30 0

摘　　要：利用溶胶 -凝胶法合成了 Ce1-x Gdx O2 -x/ 2 ( x=0 .1～ 0 .6)系列固体电解质 ,系统地研究了其结构、热膨胀系数和导电性 .XRD结果表明 ,1 60℃即完全形成立方萤石结构 .由于溶胶 -凝胶法合成的物质粒度均匀 ,颗粒小 ,故在较低温度 ( 1 30 0℃ )时即可形成高致密样品 ,此温度明显低于传统的高温固相法烧结温度( 1 60 0～ 1 65 0℃ ) .高温 X射线衍射测得 Ce0 .8Gd0 .2 O1.9的热膨胀系数为 8.1 2 5× 1 0 -6K-1.阻抗谱表明 ,溶胶 -凝胶法合成可减少或消除固体电解质的晶界电阻 ,60 0℃时 Ce0 .8Gd0 .2 O1.9的电导率为 5 .2 6× 1 0 -3S/cm,活化能 Ea=0 .82 e V.A series of solid electrolytes Ce 1- x Gd x O 2- x /2 ( x =0~0.6) was prepared by sol gel method. The structure, thermal expansion coefficient and electrical properties of the solid solutions were systematically studied. XRD data showed that a complete cubic fluorite structure was formed at 160 ℃. The purity of the product prepared by the sol gel method is higher, the grain size is uniformly smaller. They were easily sintered into highly dense ceramic pellets at 1 300 ℃. The sintering temperature was significantly lower than that by traditionally high temperature solid phase reaction method. The thermal expansion coefficient of Ce 0.8 Gd 0.2 O 1.9 , determined from high temperature XRD data, is 8.125×10 -6 K -1 . Impedance spectra analyses showed that the grain boundary resistance of the solid electrolyte prepared by sol gel method was reduced or even eliminated. The conductivity of Ce 0.8 Gd 0.2 O 1.9 is 5.26×10 -3 S/cm at 600 ℃. The activation energy ( E a) is 0.82 eV.

关 键 词：固体电解质 溶胶-凝胶法 氧离子导体 合成 二氧化铈 电导率 阻抗谱 氧化镉 

分 类 号：TM24[一般工业技术—材料科学与工程]