BaCe_(1-x)RE_xO_(3-0.5x)的溶胶 - 凝胶法合成及离子导电性

Synthesis and Ionic Conductivity of BaCe 1- x RE x O 3-0.5 x Prepared by Sol-gel Method

用溶胶－凝胶法合成了系列钙钛矿结构的ＢａＣｅ１－ｘＲＥｘＯ３－０．５ｘ（ＲＥ＝Ｌａ，Ｎｄ，Ｓｍ，Ｅｕ，Ｇｄ，Ｄｙ，Ｈｏ，Ｅｒ和Ｙ）复合氧化物，通过ＸＲＤ和热分析对样品结构及生成过程进行了研究．测定了不同温度下样品的交流阻抗谱，讨论了稀土离子掺杂对ＢａＣｅＯ３电性质的影响．溶胶－凝胶法比固相反应法合成温度降低了６００～８００℃，稀土掺杂使ＢａＣｅＯ３离子导电率提高了１０～４０倍．

A series of perovskite complex oxides BaCe 1- x RE x O 3-0.5 x (RE=La,Nd,Sm,Eu,Gd,Dy,Ho,Er and Y) were synthesized by sol gel method. The structure and synthetic process were studied by XRD, TGA and DTA. The ionic conductivities were measured at diffe rent temperature by ac impedance method. The effects of RE 3+ dopant on the conductivities of BaCeO 3 were discussed. The synthetic temperature by sol gel method was 600￣800 ℃ lower than that by traditional ceramic method. The ionic conductivities of BaCeO 3 doped with RE 3+ were 10￣40 times as much as that of pure BaCeO 3.