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We propose a simple microscopic model of molecular dynamics simulation tostudy orientational glass in three dimensions. We present simulation resultsfor mixtures of mildly anisotropic particles and spherical impurities. Werealize fcc solids without orientational order in a rotator phase. As thetemperature $T$ is lowered, the disordered matrix is gradually replaced by fourkinds of orientationally ordered, rhombohedral domains. Two-phase coexistenceis realized in a temperature window. The impurities serve to anchor theorientations of the surrounding anisotropic particles, resulting in finelydivided domains or medium long-range orientational order. We examine therotational dynamics of the molecular orientations which is slowed down at low$T$. We predict the shape memory effect under a stretching cycle due tointer-variant transformation.

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