Numerical Simulations of Metal-Oxides

作者: Andreas Chatzopoulos

DOI: 10.18419/OPUS-5157

关键词: Mechanical engineeringPhysical chemistryLarge particleChemistry

摘要: Oxides like silicates, alumina or periclase, are materials with significant properties and therefore investigated extensively in experiment theory. The aim of this PhD thesis was to propose further develop methods, which make molecular dynamic simulations oxides large particle numbers for long simulation times possible. The work consists three parts. In the first one already existing methods simulating will be discussed, while second their methodological progress presented. third chapter is solely reserved phenomenon flexoelectricity, has been discovered during visualization crack propagation alumina. Oxide, wie z.B. Silikate, Korund oder Periklas, sind bedeutende Funktionswerkstoffe und werden daher experimentell theoretisch intensiv untersucht. Ziel dieser Dissertation war es, Verfahren vorzustellen derart zu optimieren, dass sie Molekulardynamiksimulationen von Oxiden mit grosen Teilchenzahlen uber lange Zeiten ermoglichen. Die Arbeit gliedert sich dabei drei Bereiche. Im ersten Teil wird auf die einzelnen bereits vorhandenen Methoden zur Simulation eingegangen, im zweiten Kapitel deren Verbesserung vorgestellt. Der dritte Bereich widmet ausschlieslich dem Phanomen der Flexoelektrizitat, welche durch geschickte Visualisierung Rissausbreitung entdeckt wurde.

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