Li ion mobility in TeO<sub>2</sub>---LiO<sub>0.5</sub>---LiX (X = F, Cl) glasses determined by Li NMR and impedance spectroscopy期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Li ion mobility in TeO₂---LiO_0.5---LiX (X = F, Cl) glasses determined by Li NMR and impedance spectroscopy

Authors:	J M Rau S Rossignol B Tanguy M A Paris J M Rojo J Sanz

Institution:	^a Institut de Chimie de la Matière Condensée de Bordeaux, Château Brivazac, Av. du Docteur A. Schweitzer, 33608, Pessac, Cedex, France ^b Instituto de Ciencla de Materiales, CSIC, c/Serrano 115 dpdo, 28006, Madrid, Spain

Abstract:	NMR and impedance spectroscopies have been used to study the Li⁺ ion mobility in the TeO₂---LiO_0.5---LiX (X = F, Cl) glasses. Activation energies determined from the temperature dependence of dc conductivity data decrease as the lithium or halogen content increases. Activation energies deduced from the analysis of the ac conductivity data in the complex modulus formalism and corresponding to the true one-particle energy barrier of ionic motion according to the coupling model, have been compared to those deduced from NMR data (T₁⁻¹ relaxation time): a good agreement is obtained. Finally, the influence of the glass composition and ion distribution on Li⁺ ion mobility has been discussed.

Keywords:	Glass Impedance spectroscopy Ionic conductivity-lithium NMR Tellurium oxide
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