Formation and Characterization of Li0.24+2xLa0.59-xMxTiO3-LaPO4 (M=K, Na) System
来源期刊：JOURNAL OF RARE EARTHS2005年第4期
论文作者：Wang Wenji Liu Huiyong
Key words：fast ionic conductor; perovskite; rare earths;
Abstract: Li0.24+2xLa0.59-xMxTiO3-LaPO4 (M=K, Na) fast ionic conductor was synthesized by high temperature solid state reaction. A.C. Impedance measurements show that the compositions of system have better conductivities in low doping content of Na+ and K+, as the doping content increases, the conductivity goes down in Na+ doping system. But in doping K+ system, the conductivity goes down and then goes up with the increasing content of K+. The activation energies of different doped ions are about 20 kJ·mol-1 in the temperature range of 25～400 ℃. X-ray powder diffraction shows that the doped Na+ and K+ would not affect the structure of compositions in the system. The main phase is Li0.24+2xLa0.59-xMxTiO3 perovskite solid solution, LaPO4 as a second phase also can be found. With increasing the content of M (x＞0.04), unknown phase appears. IR measurement also indicates that the structure of compositions in the system would not be affected by doping alkali ion.
Wang Wenji1，Liu Huiyong1
(1.Department of Chemistry, Fuzhou University, Fuzhou 350002, China)
Abstract:Li0.24+2xLa0.59-xMxTiO3-LaPO4 (M=K, Na) fast ionic conductor was synthesized by high temperature solid state reaction. A.C. Impedance measurements show that the compositions of system have better conductivities in low doping content of Na+ and K+, as the doping content increases, the conductivity goes down in Na+ doping system. But in doping K+ system, the conductivity goes down and then goes up with the increasing content of K+. The activation energies of different doped ions are about 20 kJ·mol-1 in the temperature range of 25～400 ℃. X-ray powder diffraction shows that the doped Na+ and K+ would not affect the structure of compositions in the system. The main phase is Li0.24+2xLa0.59-xMxTiO3 perovskite solid solution, LaPO4 as a second phase also can be found. With increasing the content of M (x＞0.04), unknown phase appears. IR measurement also indicates that the structure of compositions in the system would not be affected by doping alkali ion.
Key words:fast ionic conductor; perovskite; rare earths;
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