Berlin 2008 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 5: Nanostructured Materials II
MM 5.4: Vortrag
Montag, 25. Februar 2008, 12:45–13:00, H 0107
Molecular Dynamics Simulations of Nanoglasses — •Daniel Sopu1, Karsten Albe1, and Herberg Gleiter2 — 1Institut f. Materialwissenschaft, TU Darmstadt, Petersenstr. 23, D-64287 Darmstadt — 2Inst. f. Nanotechnologie, FZ Karlsruhe, D-76021 Karlsruhe
We present molecular dynamics simulations on the structure and stability of nanoglasses that can be generated by consolidating nanometer-sized glassy spheres at high pressures (several GPa). Our results suggest that nanoglasses consist in the as prepared state of glassy regions resulting from the consolidated spheres and interfaces between these glassy regions. In these glass/glass interfaces, the free volume is enhanced and the nearest neighbor co-ordinations deviate from the ones in the glassy regions. If these nanoglasses are annealed, the enhanced free volume in the glass/glass interfaces delocalize and, thus, modifies the atomic structure of the entire material. In conclusion, nanoglasses may pave the way to tune the free volume (density) of glasses at constant chemical composition.