Size-dependent vitrification in hybrid glasses at micro-meter scale

IF 6.4 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY
Hui-Ru Zhang, Qun Yang, Zi-Luo Fang, Wei-Xiong Zhang, Zheng Yin, Ming-Hua Zeng, Hai-Bin Yu
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Abstract

Hybrid glasses are a novel class of glass formers that possess unique coordination bonds. Size effects on vitrification have been observed in other glassy materials such as metallic glasses and polymers, but their impact on hybrid glasses has yet to be explored. In this study, we examine the size-dependent vitrification behavior of hybrid glasses using fast scanning calorimetry across a broad range of heating and cooling rates. Our results are similar to that observed in polymer and metallic glasses, the glass transition temperature (Tg) is not significantly influenced by sample size at the micro-meter scale at cooling rates larger than or equal to 30 K/s. Furthermore, the vitrification enthalpy displays a clear dependence on sample size, with smaller samples exhibiting a larger overshoot enthalpy, which is attributed to a reduction of fictive temperature values (Tf) with size. These features originate from the network structure and flexibility of coordination bonding. Our findings suggest that the vitrification enthalpy is more fundamental than the temperature in size effects and that the low enthalpy state of smaller hybrid glass samples has implications for their functional properties.

微米尺度杂交玻璃的尺寸依赖玻璃化
杂化玻璃是一类具有独特配位键的新型玻璃形成物。尺寸对玻璃化的影响已经在其他玻璃材料如金属玻璃和聚合物中观察到,但它们对混合玻璃的影响还有待探索。在这项研究中,我们使用快速扫描量热法在广泛的加热和冷却速率范围内检查了混合玻璃的尺寸依赖的玻璃化行为。我们的结果与在聚合物和金属玻璃中观察到的结果相似,在大于或等于30 K/s的冷却速率下,玻璃化转变温度(Tg)在微米尺度上不受样品尺寸的显著影响。此外,玻璃化焓明显依赖于样品大小,较小的样品表现出较大的超调焓,这归因于有效温量值(Tf)随尺寸的减小。这些特点源于网络结构和配位键合的灵活性。我们的研究结果表明,玻璃化焓比温度在尺寸效应中更重要,较小的杂化玻璃样品的低焓状态对其功能特性有影响。
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来源期刊
Science China Physics, Mechanics & Astronomy
Science China Physics, Mechanics & Astronomy PHYSICS, MULTIDISCIPLINARY-
CiteScore
10.30
自引率
6.20%
发文量
4047
审稿时长
3 months
期刊介绍: Science China Physics, Mechanics & Astronomy, an academic journal cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China, and published by Science China Press, is committed to publishing high-quality, original results in both basic and applied research. Science China Physics, Mechanics & Astronomy, is published in both print and electronic forms. It is indexed by Science Citation Index. Categories of articles: Reviews summarize representative results and achievements in a particular topic or an area, comment on the current state of research, and advise on the research directions. The author’s own opinion and related discussion is requested. Research papers report on important original results in all areas of physics, mechanics and astronomy. Brief reports present short reports in a timely manner of the latest important results.
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