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采用水热法合成了系列双掺杂的萤石结构 Ce1 - x Lnx Ca0 .2 O1 .8- 0 .4x固溶体 ,并研究了 3种稀土离子对固溶体导电性的影响 ,发现掺杂离子半径接近 Ce4+时 ,体系电导率增大而活化能降低 .同时发现水热合成的Ce1 - x Lnx Ca0 .2 O1 .8- 0 .4x样品的平均粒度按着掺入离子 Y3+ ,Gd3+ ,La3+ 的顺序逐渐减小 ,分别为 32 ,2 0和1 5 nm.这种变化是由于 Y3+ 半径比 La3+ 和 Gd3+ 更接近 Ce4+ ,因而在水热合成过程中 ,掺 Y3+ 的体系更有利于晶粒的生长 ,得到的晶体粒度较大
A series of double-doped fluorite Ce1 - x Lnx Ca0 .2 O1 .8 - 0.4x solid solutions were synthesized by hydrothermal method. The effects of three kinds of rare earth ions on the conductivity of the solid solution were also investigated. The results show that the doping ion radius is close to Ce4 +, the conductivity of the system increased while the activation energy decreased.At the same time, it was found that the average particle size of hydrothermally synthesized Ce1 - x Lnx Ca0 .2 O1 .8 - 0.4x samples gradually increased in the order of doping ions Y3 +, Gd3 + and La3 + Are 32, 20 and 15 nm, respectively, due to the fact that the Y3 + radius is closer to Ce4 + than La3 + and Gd3 +, and therefore the Y3 + -doped system is more conducive to the grain growth during the hydrothermal synthesis. Larger crystal size