Electrical and optical investigations in Te-Ge-Ag and Te-Ge-AgI chalcogenide glasses

JOURNAL OF ALLOYS AND COMPOUNDS

卷:639

Article

Cui, S.^1,2  Le Coq, D.¹  Boussard-Pledel, C.¹  Bureau, B.¹ 

[1] Univ Rennes 1, Inst Chem Sci Rennes, Glass & Ceram Lab, UMR CNRS 6226, F-35042 Rennes, France

[2] Zhejiang Univ, Dept Mat Sci & Engn, Hangzhou 310027, Peoples R China

关键词: Chalcogenide glasses;    Electrical conductivity;    Impedance spectroscopy;   

DOI  :  10.1016/j.jallcom.2015.03.138

来源: Elsevier

【 摘 要 】

(GeTe4)(100) Ag-x(x) and (GeTe4)(100) (x)(AgI)(x) glasses were prepared by a melting-quenching method. The glass electrical conductivity was investigated by both electrochemical impedance spectroscopy at different temperatures from 283 K to 333 K and four-probe method at room temperature (293 K). Meanwhile, as a major factor determining the electrical conductivity of a solid, optical band gap was also studied. By comparing the electrical conductivity values and glass optical band gap evolution, it was found that (GeTe4)(100) Ag-x(x) glasses are mainly electronic conductive. On the other hand, the electrical conductivities of (GeTe4)(100) (x)(AgI)(x) glasses firstly show a monotonic decrease by increasing AgI up to 15 mol.%, and then an increase when the AgI content is higher than 15 mol.%. The activation energy E-a and the pre-exponential factor r0 show apparent turning point when AgI content is 15 mol.%, signifying a conductivity mechanism change. In this paper, correlations between the conductivity and hypothetical structures in (GeTe4)(100) Ag-x(x) and (GeTe4)(100) (x)(AgI)(x) glasses are done and the importance of the Ag role is underlined. (C) 2015 Elsevier B. V. All rights reserved.

【 授权许可】

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