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

Abstract

International audience(GeTe4)​100-​xAgx and (GeTe4)​100-​x(AgI)​x glasses were prepd. by a melting-​quenching method. The glass elec. cond. was investigated by both electrochem. impedance spectroscopy at different temps. from 283 K to 333 K and four-​probe method at room temp. (293 K)​. Meanwhile, as a major factor detg. the elec. cond. of a solid, optical band gap was also studied. By comparing the elec. cond. values and glass optical band gap evolution, it was found that (GeTe4)​100-​xAgx glasses are mainly electronic conductive. On the other hand, the elec. 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 Ea and the pre-​exponential factor σ0 show apparent turning point when AgI content is 15 mol.​%, signifying a cond. mechanism change. In this paper, correlations between the cond. and hypothetical structures in (GeTe4)​100-​xAgx and (GeTe4)​100-​x(AgI)​x glasses are done and the importance of the Ag role is underlined

GeS2–Ga2S3–LiCl Glass System: Electrical Conductivity and Structural Considerations

“…This specificity can be related to the isotropic properties and no grain boundaries in glasses, explaining the higher conductivity values generally observed than in their crystal counterparts . Electrical conductivity in alkali chalcogenide glasses has also been intensively investigated during last decades in different glassy systems . Due to their specific electrical conductivity properties, these ones can be suitable to be used as solid‐state electrolytes, which are attracting for their safety and reliability .…”

“…2 Electrical conductivity in alkali chalcogenide glasses has also been intensively investigated during last decades in different glassy systems. [3][4][5][6][7][8][9][10] Due to their specific electrical conductivity properties, these ones can be suitable to be used as solid-state electrolytes, which are attracting for their safety and reliability. 11,12 More specifically, sulfurand lithium-based systems are great of interest because of their low electronic contribution to the electrical conductivity as, for example, in glasses such as Li 2 S-SiS 2 , GeS 2 , P 2 S 5 , B 2 S 3 , or AsS 3. drawback, the GeS 2 -Ga 2 S 3 matrix has been chosen as a glass host because GeS 2 is one of the more thermally stable chalcogenide glass former and because Ga 2 S 3 , integrated as a glass intermediate, uses to extend the glass-forming range.…”

Optical properties of Ag- and AgI-doped Ge–Ga–Te far-infrared chalcogenide glasses

“…Elemental Ag and I show positive and negative effects on the glasses, respectively. Consequently, by combining two elements together, such as AgI, the effect on the glasses is determined by I atoms [19]. The function relationship between absorption coefficient α(ω) and optical band gap Eopt is given by Tauc equation [20]:…”

Effect of heat treatment on AgI‐rich chalcogenide glasses with enhanced ionic conductivity

“…This approach improves the thermo‐mechanical properties, particularly thermal expansion, thermal shock sensitivity, and resistance to crack propagation of chalcogenide glasses . Notably, microcrystals of AgI contained chalcogenide glass‐ceramic have become a focus research because of their potential application in solid‐state batteries, in which Ag + ions exhibit high ionic conductivity exceeding 10 −3 S/cm at room temperature. Superionic conductor α‐AgI has a high ionic conductivity of 1 S/cm when it is thermodynamically stable above 147°C.…”