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MM: Fachverband Metall- und Materialphysik

MM 11: Liquid and Amorphous Metals III

MM 11.2: Vortrag

Montag, 14. März 2011, 16:00–16:15, IFW D

A fundamental new approach on structure formation — •Peter Häussler — Chemnitz University of Technology, Institute of Physics, 09107 Chemnitz, Germany

Whereas the formation of molecules is well understood the formation of crystalline matter is not. Liquid and amorphous systems are somewhere inbetween. The number of atoms is already huge and hence Schrödingers equation is unable to treat them properly. Thermodynamics fails too due to its incompleteness: the lack of momentum and angular momentum, indispensable incredients of any description of structure formation.

Liquid and amorphous systems are by no mean really disordered, instead show well defined structural order. We show for all the liquid elements along the Periodic Table, known to us, that their structural features are formed under the influence of resonances between global subsystems as there are the Fermi gas of the electrons as one, and the forming static structure as the other one. Both mutually adjust and trigger medium-ranging spherical-periodic order (SPO) in the mean around any atom. The fundamental processes causing this feature may once help us to understand better the formation of long-ranging crystalline order, nucleation and growth. We present a new analysis of all the structural data, discuss the resonance interaction based on momentum exchange as the driving effect which causes bonding as well as anti-bonding states between the global subsystems. We discuss the importance of entropy creation when the total system finally occupies the bonding state.