Effect of Sr2+ on Properties of Li0.2375+xLa0.5875-xSrxTiO3-LaPO4 System
来源期刊：JOURNAL OF RARE EARTHS2004年第2期
论文作者：蔡增良 王文继 李荣华 刘慧勇
Key words：inorganic chemistry; fast ionic conductor; perovskite; Sr2+ dopping; rare earths;
Abstract: Li0.2375+xLa0.5875-xSrxTiO3-LaPO4 fast ionic conductor was synthesized by high temperature solid state reaction.A.C.impedance measurements show that the system has higher conductivity in low doping content of Sr2+,but the conductivity goes down from 5.78×10-5 to 3.11×10-7 S*cm-1 with increasing the content of Sr2+.The activation energy is about 20 kJ*mol-1 in the temperature range of 25～400 ℃.X-ray powder diffraction shows that the doping Sr2+ would not affect the structure of compositions in the system.The main phase is Li0.2375+xLa0.5875-xSrxTiO3 perovskite solid solution,LaPO4 as a second phase can also be found.With increasing the content of Sr2+(x>0.05),another phase SrTiO3 appears.IR measurement also indicates that the structure of compositions in the system would not be affected by Sr2+ doping.The decomposition voltage of Li0.2375+xLa0.5875-xSrxTiO3-LaPO4 remain unchanged(1.5 V).
蔡增良1，王文继1，李荣华1，刘慧勇1
(1.Department of Chemistry,Fuzhou University,Fuzhou 350002,China)
Abstract:Li0.2375+xLa0.5875-xSrxTiO3-LaPO4 fast ionic conductor was synthesized by high temperature solid state reaction.A.C.impedance measurements show that the system has higher conductivity in low doping content of Sr2+,but the conductivity goes down from 5.78×10-5 to 3.11×10-7 S*cm-1 with increasing the content of Sr2+.The activation energy is about 20 kJ*mol-1 in the temperature range of 25～400 ℃.X-ray powder diffraction shows that the doping Sr2+ would not affect the structure of compositions in the system.The main phase is Li0.2375+xLa0.5875-xSrxTiO3 perovskite solid solution,LaPO4 as a second phase can also be found.With increasing the content of Sr2+(x>0.05),another phase SrTiO3 appears.IR measurement also indicates that the structure of compositions in the system would not be affected by Sr2+ doping.The decomposition voltage of Li0.2375+xLa0.5875-xSrxTiO3-LaPO4 remain unchanged(1.5 V).
Key words:inorganic chemistry; fast ionic conductor; perovskite; Sr2+ dopping; rare earths;
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