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arXiv 1505.00331cond-mat.dis-nn
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GexSe1-x硫系玻璃结构(α)弛豫时间反常的演化

Evolution of structural (α) relaxation-time anomalies in GexSe1-x Chalcogenide glasses

Deepak Sharma, Sujatha Sampath, A. M. Awasthi

摘要:

我们检查焓松弛整个硫系玻璃系列GexSe 1-x,制备在附近的组合物,使用传统的熔融淬火技术。我们估计的时间尺度τ(Tg)的动力学玻璃化转变温度附近,使用从MDSC(调制差示扫描量热法)测量获得的非反向热流数据在很宽的组成范围(2.1 { \lessthanequalto } r { \lessthanequalto } 2.8,r = 2x+2)。反常的弛豫特征时间τg(r)被认为是连续Ge掺杂聚合硒链中遇到的刚性转变的标志。

英文摘要:

We examine enthalpy relaxation across the chalcogenide glass series GexSe1-x, prepared over close-by compositions using conventional melt-quenching technique. We estimate the timescale τ(Tg) characterizing enthalpic relaxation near the kinetic glass transition temperature, using the non-reversing heat-flow data obtained from MDSC (modulated differential scanning calorimetry) measurements over a wide range of compositions (2.1 {\lessthanequalto} r {\lessthanequalto} 2.8, r = 2x+2). Anomalies in the enthalpy-relaxation characteristic-times τg(r) are identified as marking rigidity-transitions encountered in successive Ge-doping of polymeric selenium chains.

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