Rheology of supercooled Se-Te chain liquids: Role of Te as an interchain cross-linker

Rheology of supercooled Se-Te chain liquids: Role of Te as an interchain cross-linker
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过冷 Se-Te 链液体的流变学:Te 作为链间交联剂的作用

DOI:
10.1016/j.jnoncrysol.2019.119764
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发表时间:
2020
影响因子:
3.5
通讯作者:
Sen, Sabyasachi
Sen, Sabyasachi
中科院分区:
材料科学2区
文献类型:
--
作者:
Yuan, Bing;Aitken, Bruce;Sen, Sabyasachi

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用振荡平行板流变仪研究了过冷SexTe 100-x(70 ≤x≤ 95)液体的剪切松弛行为。缓慢的键断/更新动力学和快速的链段运动,共存于Se的弛豫时间尺度的差异单调递减,逐步加入Te,直到只有一个弛豫过程可以确定在Se 70 Te 30液体。这种弛豫动力学的演变模拟了Ge/As-Se液体的流变行为,当传统的链交联剂如Ge/As被添加到Se中时。这一发现表明Te原子通过相邻[Se,Te] n链之间的次级成键相互作用充当伪交联剂。这种链间的相互作用导致SexTe 100 − x液体在过冷区域中组成链的运动自由度降低。然而,这些液体的超液相线粘度的组成不变性表明,链间相互作用的约束可以在高温下解除。
The shear relaxation behavior of supercooled SexTe100-x(70 ≤x≤ 95) liquids are studied using oscillatory parallel plate rheometry. The difference in the relaxation timescales of the slow bond scission/renewal dynamics and the fast segmental chain motion that coexist in Se decreases monotonically with progressive addition of Te, until only one relaxation process can be identified in the Se70Te30liquid. This evolution of the relaxation dynamics mimics the rheological behavior of Ge/As-Se liquids, when traditional chain crosslinkers such as Ge/As is added to Se. This finding suggests that the Te atoms serve as pseudo-crosslinkers via secondary bonding interactions between adjacent [Se,Te]nchains. This interchain interaction results in a lowering of the motional degrees of freedom of the constituent chains in SexTe100−xliquids in the supercooled region. However, the compositional invariance of the superliquidus viscosity of these liquids suggests that the interchain interaction constraint can be lifted at high temperatures.
使用压力辅助熔体填充技术分析 As2Se3、Se 和 Se95Te5 硫族化物熔体的粘度数据
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