Investigation of the substitution of mercury by silver in Ag2S-HgS-GeS2 glasses: Macroscopic, electrical and vibrational properties

IF 3.2 3区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS
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Abstract

The evolution of structure and physical properties was investigated in the (Ag2S)x(HgS)50-x(GeS2)50 system. It was found that the density increases with increasing silver sulfide. The DSC data show a non-monotonic change of the glass transition temperature, Tg, from 243 °C (x = 0) to 301 °C (x = 50) with the minimum at 231 °C for x = 10 sample. The dual structure of HgS, which consists of the presence of dimorphic tetrahedral and chain forms of HgS, is found to be responsible for the non-monotonic change of the Tg. An increase in silver content leads to a significant enhancement of ionic conductivity from ∼10−14 S.cm−1 (x = 0) to ∼10−3 S.cm−1 (x = 50). The gradual structural evaluation is evidenced by the disappearance of the main Raman feature at ≈300 cm−1 related to the Hg-S stretching and the emergence of two contributions for silver-rich glasses at ≈370 cm−1 and at ≈400 cm−1.

关于 Ag2S-HgS-GeS2 玻璃中银取代汞的研究:宏观、电学和振动特性
研究了 (Ag2S)x(HgS)50-x(GeS2)50 体系中结构和物理性质的演变。研究发现,密度随着硫化银的增加而增加。DSC 数据显示,玻璃化转变温度 Tg 从 243 ℃(x = 0)到 301 ℃(x = 50)呈非单调变化,x = 10 样品的最低温度为 231 ℃。研究发现,HgS 的双重结构是造成 Tg 非单调变化的原因,这种结构包括 HgS 的二态四面体和链状结构。银含量的增加导致离子电导率从 ∼10-14 S.cm-1 (x = 0) 显著提高到 ∼10-3 S.cm-1 (x = 50)。与 Hg-S 伸展有关的 ≈300 cm-1 处的主要拉曼特征消失了,而在 ≈370 cm-1 和 ≈400 cm-1 处出现了富银玻璃的两个贡献,这证明了对结构的逐步评估。
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来源期刊
Journal of Non-crystalline Solids
Journal of Non-crystalline Solids 工程技术-材料科学:硅酸盐
CiteScore
6.50
自引率
11.40%
发文量
576
审稿时长
35 days
期刊介绍: The Journal of Non-Crystalline Solids publishes review articles, research papers, and Letters to the Editor on amorphous and glassy materials, including inorganic, organic, polymeric, hybrid and metallic systems. Papers on partially glassy materials, such as glass-ceramics and glass-matrix composites, and papers involving the liquid state are also included in so far as the properties of the liquid are relevant for the formation of the solid. In all cases the papers must demonstrate both novelty and importance to the field, by way of significant advances in understanding or application of non-crystalline solids; in the case of Letters, a compelling case must also be made for expedited handling.
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