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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。
Using LiTi2 (PO4) 3 as the base, lithium fast ion conductor material Li1.4A l0.1Mg0.1Ti1.8Si0.1P2.9O12 (hereinafter referred to as TM1) and Li1.8A l0.1Mg0.3Ti1.6Si0.1P2.9O12 (hereinafter referred to as TM2). The conductivity of the composites was measured by AC impedance technique. The conductivity of TM1 synthesized at 850, 900 and 950 ℃ measured at 298 K were 1.05 × 10-4 S / cm, 1.11 × 10-4 S / cm and 1.31 × 10-4 S / cm, respectively. Under the same conditions, The conductivity of TM2 was 7.41 × 10-5S / cm, 7.81 × 10-5S / cm and 8.11 × 10-5S / cm, respectively. The above data show that, TM1 and TM2 ion conductivity increases with the synthesis temperature. The ionic conductivity measured at 373, 473, 573 and 673 K also showed the above tendency. The composition with the reaction temperature of 950 ° C had the highest conductivity and the composition with the reaction temperature of 850 ° C had the lowest ionic conductivity. Therefore, the optimum synthesis temperature of TM1 and TM2 was 950 ° C. When T ≧ 100 ° C, the ionic conductivity of TM2 is larger than that of TM1. X-ray diffraction analysis results show that TM1 and TM2 have the space group R3c at different reaction temperatures (850, 900, 950 ℃).