【摘要】 以LiTi2(PO4)3为基,用分析纯原料经高温固相反应(850、900、950℃)制得锂快离子导体材料Li1.4A l0.1Mg0.1Ti1.8Si0.1P2.9O12(以下简称TM1)和Li1.8A l0.1Mg0.3Ti1.6Si0.1P2.9O12(以下简称TM2)。用交流阻抗技术测定了合成物的电导率。反应温度为850、900和950℃合成的TM1在298 K测定的电导率分别为1.05×10-4S/cm,1.11×10-4S/cm,1.31×10-4S/cm;同样条件下合成的TM2的电导率分别为7.41×10-5S/cm,7.81×10-5S/cm,8.11×10-5S/cm。以上数据表明,TM1和TM2的离子电导率随着合成温度的升高而增大。在373、473、573和673 K测定的离子电导率也呈上述趋势。反应温度为950℃的合成物的电导率最高,反应温度为850℃的合成物的离子电导率最低,因此,TM1和TM2的最佳合成温度为950℃。T≥100℃时,TM2的离子电导率比TM1的大。X射线衍射分析结果表明,TM1和TM2在不同的反应温度(850、900、950℃)下均得到空间群为R3c的合成物。更多还原

【Abstract】 Pure analytic reagents were used to prepare new lithium fast ion conductors Li_1.4Al_0.1Mg_0.1Ti_1.8Si_0.1P_2.9O₁₂（TM1） and Li_1.8Al_0.1Mg_0.3Ti_1.6Si_0.1P_2.9O₁₂（TM2） by high temperature（850,900 and 950 ℃） solid phase reaction.The ionic conductivities of TM1 and TM2 were measured by AC impedance method at 298 K.The conductivities of TM1 synthesized at 850,900 and 950 ℃ are 1.05×10^-4 S/cm,1.11×10^-4 S/cm and 1.31×10^-4 S/cm,and those of TM2 are 7.41×10^-5 S/cm,7.81×10^-5 S/cm and 8.11×10^-5 S/cm,respectively.The data indicate that the conductivities of TM1and TM2 rise with the reaction temperature.The conductivities measured at 373,473,573 and 673 K have the same trend:the conductor synthesized at 950 ℃ has the highest conductivity,while that synthesized at 850 ℃ has the lowest conductivity.The temperature of 950 ℃ is fit for preparing TM1and TM2.At T≥100 ℃,the conductivities of TM2 are bigger than those of TM1.X-ray powder diffraction shows that a Lisicon phase with space group exists in the conductors which were prepared at different high temperatures.更多还原