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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 >Dipolar and orientational glass formation in two-dimensional films of CO mixtures
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Dipolar and orientational glass formation in two-dimensional films of CO mixtures

机译：CO混合物二维薄膜中的偶极和定向玻璃形成

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Heat-capacity and dielectric measurements have been performed to study orientational and dipolar order and disorder phenomena in submonolayer films of CO and binary mixtures of CO physisorbed on graphite and boron nitride (BN). With both methods transitions to quadrupolar and dipolar ordered low-temperature phases have been found for pure CO. Calorimetric measurements revealed that the dipolar transition of CO on graphite belongs to the universality class of the two-dimensional (2D) Ising model. It will be shown that in dilute mixtures of CO with CH4 molecules a dramatic suppression of this phase transition occurs. This effect turned out to be much stronger than that previously observed in (CO)(1-x)(N-2)(x) and (CO)(1-x)(Ar)(x) mixtures, which could be successfully described by the random-field theory. From dielectric experiments first information on the dynamics of CO and (CO)(1-x)(Ar)(x) films was gained and activation energies and attempt frequencies for reorientation processes of CO determined. Both employed methods consistently indicate that at impurity concentrations beyond 6-7% dipolar and orientational glass states are formed. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 39]
机译：已经进行了热容量和介电测量，以研究CO的亚单层膜以及物理吸附在石墨和氮化硼（BN）上的CO的二元混合物的取向和偶极有序和无序现象。通过这两种方法，已经发现纯CO转变为四极和偶极有序的低温相。量热测量显示，石墨上CO的偶极转变属于二维（2D）Ising模型的通用性类别。将会显示出，在CO与CH4分子的稀混合物中，会显着抑制这种相变。事实证明，此效果比以前在（CO）（1-x）（N-2）（x）和（CO）（1-x）（Ar）（x）混合物中观察到的效果要强得多，这可能是成功的由随机场理论描述。从介电实验中，首先获得了有关CO和（CO）（1-x）（Ar）（x）薄膜动力学的信息，并确定了CO的重新取向过程的活化能和尝试频率。两种采用的方法一致地表明，在杂质浓度超过6-7％时，会形成偶极和取向玻璃态。 （C）2002 Elsevier Science B.V.保留所有权利。 [参考：39]

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