Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 20: Symposium SYCM: Crystallography in materials science

HL 20.3: Hauptvortrag

Montag, 31. März 2014, 16:00–16:30, HSZ 02

Modulated martensite: A scale bridging Lego game for crystallographers and physicists — •Sebastian Fähler — IFW Dresden, P.O. Box 270116, 01171 Dresden, Germany — Technische Universität Dresden, Department of Physics, Institute for Solid State Physics, 01062 Dresden, Germany — Technische Universität Chemnitz, Faculty of Natural Sciences, Institute of Physics, D-09107 Chemnitz, Germany

Among various materials exhibiting reversible phase transformations structures with low crystal symmetry, so-called modulated phases, exhibit the best ferroelectric, magnetocaloric or magnetic shape memory properties. Here it is describe how modulated martensite can be built in a kind of Lego game from simple tetragonal building blocks. It's complex crystallographic (micro-) structure is determined by the boundary conditions during the nucleation process. Though this building principle can be describe in terms of continuum mechanics, it is consistent with first principle calculations. Supported by SPP 1239 and SPP 1599.