Dresden 2020 – scientific programme

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DS: Fachverband Dünne Schichten

DS 40: Thin Film Properties: Structure, Morphology and Composition I

DS 40.1: Talk

Thursday, March 19, 2020, 15:00–15:15, CHE 89

Novel Type of Bent-Lattice Nanostructure in Crystallizing Amorphous Films: from Transrotational Crystals to Amorphous Models — •Vladimir Kolosov — Ural Federal University, Ekaterinburg, Russia

Unusual transrotational thin crystals with curvilinear lattice [1] have been discovered by transmission electron microscopy (TEM) for crystal growth in thin (10-100 nm) amorphous films for growing number of different substances. The formation of unexpected transrotational nanostructures can be traced in situ in TEM column. Transrotation (unit cell translation is complicated by small rotation realized round an axis lying in the film plane) can result in strong regular lattice orientation gradients (up to 300 degrees per 1 micron) of different geometries: cylindrical, ellipsoidal, toroidal, saddle, etc. Complex skyrmion-like lattice orientation texture is observed in some spherulite crystals. The transrotation phenomenon is the basis for novel lattice-rotation/strain nanoengineering. Transrotational micro crystals have been eventually recognized in some vital thin film materials, i.e. PCMs for memory [2-3]. New nanocrystalline models of amorphous state are proposed: fine-grained structures with lattice curvature. Going to 3D clusters of positive/negative curvature and dynamics we propose the hypothesis of "dilatons" and "contractons" pulsating or/and circulating in amorphous/glassy solids. [1] V.Yu. Kolosov and A.R.Tholen, Acta Mat., 48 (2000) 1829. [2] B.J. Kooi and J.T.M. De Hosson, JAP, 95 (2004), 4714. [3] E. Rimini et al, JAP, 105 (2009), 123502.