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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >The Boson peak in structural and orientational glasses of simple alcohols: specific heat at low temperatures
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The Boson peak in structural and orientational glasses of simple alcohols: specific heat at low temperatures

机译：简单醇的结构玻璃和定向玻璃中的玻色子峰：低温下的比热

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We review in this work specific-heat experiments, that we have been conducted on different hydrogen-bonded glasses during recent years. Specifically, we have measured the low-temperature specific-heat C-p for a set of glassy alcohols: normal and fully deuterated ethanol, 1- and 2-propanol, and glycerol. Ethanol exhibits a very interesting polymorphism presenting three different solid phases at low temperature: a fully ordered (monoclinic) crystal, an orientationally disordered (cubic) crystal or 'orientational glass', and the ordinary structural glass. By measuring and comparing the low-temperature specific heat of the three phases, in the 'Boson peak' range 2-10 K as well as in the tunneling-states range below 1 K, we are able to provide a quantitative confirmation that 'glassy behavior' is not an exclusive property of amorphous solids. On the other hand, propanol is the simplest monoalcohol with two different stereoisomers (1- and 2-propanol); this allows us to study directly the influence of the spatial rearrangement of atoms on the universal properties of glasses. We have measured the specific heat of both isomers, finding a noteworthy quantitative difference between them. Finally, low-temperature specific-heat data of glassy glycerol have also been obtained. Here we propose a simple method based upon the soft-potential model to analyze low-temperature specific-heat measurements, and we use this method for a quantitative comparison of all these data from glassy alcohols and as a stringent test of several universal correlations and scaling laws suggested in the literature. In particular, we find that the interstitialcy model for the Boson peak [Phys. Rev. Lett. 68 (1992) 9741 gives a very good account of the temperature T-max at which the maximum in C-p/T-3 occurs. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 42]
机译：在这项工作的比热实验中，我们回顾了近年来在不同的氢键玻璃上进行的实验。具体来说，我们已经测量了一组玻璃态醇的低温比热C-p：正和完全氘代的乙醇，1-和2-丙醇以及甘油。乙醇表现出非常有趣的多态性，在低温下呈现三种不同的固相：完全有序的（单斜晶）晶体，取向无序的（立方）晶体或“定向玻璃”和普通的结构玻璃。通过测量和比较三相的低温比热，在“玻色子峰”范围为2-10 K以及在隧穿态范围为1 K以下，我们能够提供定量的确认，即“玻璃态行为”不是非晶态固体的排他性。另一方面，丙醇是最简单的一元醇，具有两种不同的立体异构体（1-和2-丙醇）。这使我们可以直接研究原子的空间重排对玻璃通用性能的影响。我们测量了两种异构体的比热，发现它们之间存在显着的定量差异。最后，还获得了玻璃状甘油的低温比热数据。在这里，我们提出了一种基于软势模型的简单方法来分析低温比热测量，并且我们使用该方法对玻璃态醇中的所有这些数据进行定量比较，并作为几种通用相关性和标度的严格测试文献中建议的法律。特别是，我们发现玻色子峰的填隙模型[Phys。莱特牧师68（1992）9741很好地说明了C-p / T-3出现最大值时的温度T-max。 （C）2002 Elsevier Science B.V.保留所有权利。 [参考：42]

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