Molecular dynamics simulation of orientational glass formation in anisotropic particle systems in three dimensions

Abstract

We propose a simple microscopic model of molecular dynamics simulation to study orientational glass in three dimensions. We present simulation results for mixtures of mildly anisotropic particles and spherical impurities. We realize fcc solids without orientational order in a rotator phase. As the temperature $T$ is lowered, the disordered matrix is gradually replaced by four kinds of orientationally ordered, rhombohedral domains. Two-phase coexistence is realized in a temperature window. The impurities serve to anchor the orientations of the surrounding anisotropic particles, resulting in finely divided domains or medium long-range orientational order. We examine the rotational dynamics of the molecular orientations which is slowed down at low $T$. We predict the shape memory effect under a stretching cycle due to inter-variant transformation.

arXiv comment6 pages, 8 figures

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Cited by in corpus (4)

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• Orientational glass in mixtures of elliptic and circular particles: Structural heterogeneities, rotational dynamics, and rheology
• Formation of double glass in binary mixtures of anisotropic particles: Dynamic heterogeneities in rotations and displacements
• Ferroelectric glass of spheroidal dipoles with impurities: Polar nanoregions, response to applied electric field, and ergodicity breakdown