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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 >Elastic properties of the degenerate crystalline phase of two-dimensional hard dimers
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Elastic properties of the degenerate crystalline phase of two-dimensional hard dimers

机译：二维硬二聚体简并结晶相的弹性性质

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摘要

Hard homonuclear dimers, each consisting of two identical and tangent hard disks, exhibit a thermodynamically stable, aperiodic solid phase, known as a degenerate crystal. The elastic properties of this phase are determined by the box fluctuation Monte Carlo method in the NpT ensemble. The computed elastic constants are well described by the free volume approximation and the coefficients of the leading singularities are estimated in the close packing limit. Three mechanisms decreasing Poisson's ratio are indicated: one is based on increasing the pressure to temperature ratio, another comes from the constrains imposed on the disks forming a dimer, yet another, working in the close packing limit, arises from molecular motions. It is also shown that Poisson's ratio increases with increasing concentration of vacancies. (c) 2006 Elsevier B.V. All rights reserved.
机译：硬同核二聚体（每个均由两个相同且相切的硬盘组成）表现出热力学稳定的非周期性固相，称为简并晶体。该阶段的弹性特性由NpT集合中的盒波动Monte Carlo方法确定。自由体积近似很好地描述了计算的弹性常数，并且在紧密堆积极限中估算了前导奇点的系数。指出了三种降低泊松比的机制：一种是基于增加压力与温度的比率，另一种是由于施加在形成二聚体的圆盘上的约束，另一种是在紧密堆积极限下工作，是由分子运动引起的。还表明泊松比随着空位集中度的增加而增加。 （c）2006 Elsevier B.V.保留所有权利。

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