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Investigation of the free volume and ionic conducting mechanism of poly(ethylene oxide)-LiClO_4 polymeric electrolyte by positron annihilating lifetime spectroscopy
引用本文:龚静,宫振丽,闫晓丽,高舒,张忠良,王波. Investigation of the free volume and ionic conducting mechanism of poly(ethylene oxide)-LiClO_4 polymeric electrolyte by positron annihilating lifetime spectroscopy[J]. 中国物理 B, 2012, 21(10): 107803-107803. DOI: 10.1088/1674-1056/21/10/107803
作者姓名:龚静  宫振丽  闫晓丽  高舒  张忠良  王波
作者单位:School of Physics and Key Laboratory of Nuclear Solid State Physics, Wuhan University, Wuhan 430072, China
基金项目:Project supported by the National Natural Science Foundation of China (Grant No. 11175134)
摘    要:The positron annihilation lifetime and ionic conductivity are each measured as a function of organophilic rectorite(OREC) content and temperature in a range from 160 K to 300 K.According to the variation of ortho-positronium(o-Ps) lifetime with temperature,the glassy transition temperature is determined.The continuous maximum entropy lifetime(MELT) analysis clearly shows that the OREC and temperature have important effects on o-Ps lifetime and free volume distribution.The experimental results show that the temperature dependence of ionic conductivity obeys the Vogel-Tammann-Fulcher(VTF) and Williams-Landel-Ferry(WLF) equations,implying a free-volume transport mechanism.A linear least-squares procedure is used to evaluate the apparent activation energy related to the ionic transport in the VTF equation and several important parameters in the WLF equation.It is worthwhile to notice that a direct linear relationship between the ionic conductivity and free volume fraction is established using the WLF equation based on the free volume theory for nanocomposite electrolyte,which indicates that the segmental chain migration and ionic migration and diffusion could be explained by the free volume theory.

关 键 词:自由体积理论  离子导电性  寿命谱  高分子电解质  正电子湮灭  导电机理  玻璃化转变温度  正电子湮没寿命
收稿时间:2012-03-04

Investigation of the free volume and ionic conducting mechanism of poly(ethylene oxide)-LiClO4 polymeric electrolyte by positron annihilating lifetime spectroscopy
Gong Jing,Gong Zhen-Li,Yan Xiao-Li,Gao Shu,Zhang Zhong-Liang,Wang Bo. Investigation of the free volume and ionic conducting mechanism of poly(ethylene oxide)-LiClO4 polymeric electrolyte by positron annihilating lifetime spectroscopy[J]. Chinese Physics B, 2012, 21(10): 107803-107803. DOI: 10.1088/1674-1056/21/10/107803
Authors:Gong Jing  Gong Zhen-Li  Yan Xiao-Li  Gao Shu  Zhang Zhong-Liang  Wang Bo
Affiliation:School of Physics and Key Laboratory of Nuclear Solid State Physics, Wuhan University, Wuhan 430072, China
Abstract:The positron annihilation lifetime and ionic conductivity are each measured as a function of organophilic rectorite (OREC) content and temperature in a range from 160 K to 300 K. According to the variation of ortho-positronium (o-Ps) lifetime with temperature, the glassy transition temperature is determined. The continuous maximum entropy lifetime (MELT) analysis clearly shows that the OREC and temperature have important effects on o-Ps lifetime and free volume distribution. The experimental results show that the temperature dependence of ionic conductivity obeys the Vogel-Tammann-Fulcher (VTF) and Williams-Landel-Ferry (WLF) equations, implying a free-volume transport mechanism. A linear least-squares procedure is used to evaluate the apparent activation energy related to the ionic transport in the VTF equation and several important parameters in the WLF equation. It is worthwhile to notice that a direct linear relationship between the ionic conductivity and free volume fraction is established using the WLF equation based on the free volume theory for nanocomposite electrolyte, which indicates that the segmental chain migration and ionic migration and diffusion could be explained by the free volume theory.
Keywords:positron  free volume  polymeric electrolyte  ionic conduction
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