不同烧结条件下Li_5La_3Nb_2O_(12)中锂离子扩散的研究  

The Investigation of Lithium Ion Diffusion in Li_5La_3Nb_2O_(12) under Different Sintering Conditions

作　　者：王伟国[1] 方前锋[2] 高云霞[2] 郝刚领[1] 马文强[1] 李卫东[1] 

机构地区：[1]延安大学物理与电子信息学院,延安716000 [2]中国科学院固体物理研究所材料物理重点实验室,合肥230031

出　　处：《科学技术与工程》2011年第21期5021-5024,共4页Science Technology and Engineering

基　　金：陕西省自然科学基金(2010JQ6007);陕西省教育厅科研项目(2010JK917;11JK0828)资助

摘　　要：通过介电损耗谱分析研究了不同烧结条件下锂离子导体Li5La3Nb2O12中锂离子的扩散。在介电损耗谱中观察到一个明显的弛豫峰,通过非线性拟合的方法得到了其弛豫参数,烧结温度为1 123 K的Li5La3Nb2O12样品弛豫参数:激活能E=0.54 eV,指前因子τ0=0.9×10-14 s;烧结温度为1 173 K的Li5La3Nb2O12样品的弛豫参数为激活能E=0.4 eV,指前因子τ0=2.7×10-12 s。后者锂离子扩散激活能小于前者,更适合于锂离子的扩散。结合晶体结构分析可得,该弛豫峰来自于锂离子在不同八面体(48 g)之间的扩散。The lithium ion diffusion in Li5La3Nb2O12 under the condition of different sintering temperature was investigated by the dielectric loss spectrum.A significant relaxation peak was observed.The relaxation parameters were obtained by non-linear fitting method.The relaxation parameters of the Li5La3Nb2O12 sample under the sintering temperature of 1 123 K are E=0.54 eV and τ0=0.9×10-14 s.The relaxation parameters of the Li5La3Nb2O12 sample under the sintering temperature of 1 173 K are E=0.4 eV and τ0=2.7×10-12 s.The lithium ion diffusion activation energy of the later sample is lower than that of the former sample.Combined with the analysis of the Li5La3Nb2O12 crystalline structure,the relaxation peak is associated with the lithium ion diffusion between different octahedral sites（48 g48 g）.

关 键 词：锂离子导体 烧结温度 锂离子扩散 Li5La3Nb2O12 

分 类 号：TM215[一般工业技术—材料科学与工程]