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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Structural and electrical characterisation of Li2O : TiO2 : SnO2 : P2O5 electrolyte glass
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Structural and electrical characterisation of Li2O : TiO2 : SnO2 : P2O5 electrolyte glass

机译：Li2O：TiO2：SnO2：P2O5电解质玻璃的结构和电学特性。

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摘要

Glasses of general formula 50Li(2)O : xSnO(2) : (10 - x)TiO2 : 40P(2)O(5) (0.0 less than or equal to x less than or equal to 10) were investigated by differential scanning calorimetry, X-ray diffraction and ac impedance, P-31 solid-state NMR and IR spectroscopies. Three isotropic resonances can be identified in the P-31 NMR spectra, which have been assigned to various phosphate species. Analysis of the ratios of integrated intensities in the P-31 spectra leads to models for the Ti and Sn coordination environments. Both TiO2 and SnO2 are found to be predominantly network forming with Ti and Sn proposed to be in five- and four-coordinate environments respectively. Analysis of ac impedance spectra collected at low temperatures reveals two forms of permittivity dispersion, viz: high frequency conductivity dispersion and Cole-Cole type relaxation, of permittivity. The activation energy of the relaxation frequency of the permittivity dispersion is equal to that of the dc conductivity, which is consistent with cooperative motion of lithium ions. The results also suggest that the observed increase in conductivity with temperature appears to be mainly due to an increase in mobility rather than increase in carrier concentration.
机译：通过差示扫描研究了通式为50Li（2）O：xSnO（2）：（10-x）TiO2：40P（2）O（5）（0.0小于或等于x小于或等于10）的玻璃量热法，X射线衍射和交流阻抗，P-31固态NMR和IR光谱。在P-31 NMR光谱中可以识别出三个各向同性的共振，这些共振已分配给各种磷酸盐。对P-31光谱中积分强度比的分析得出了Ti和Sn配位环境的模型。发现TiO2和SnO2都是主要的网络形成，而Ti和Sn分别建议在五坐标和四坐标环境中使用。对在低温下收集的交流阻抗谱的分析显示出两种形式的介电常数弥散，即：高频电导率弥散和介电常数的Cole-Cole型弛豫。介电常数分散体的弛豫频率的活化能等于直流电导率的活化能，这与锂离子的协同运动一致。结果还表明，观察到的电导率随温度的升高似乎主要是由于迁移率的提高而不是载流子浓度的提高。

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