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Sesquioxides offer excellent thermal-mechanical properties. They have a high intrinsic thermal conductivity and good mechanical stability. Furthermore doping with rare earth ions in high concentration is possible because of the similar atomic radii. Especially ytterbium is an interesting active ion due to its very simple energy-level-scheme with only two multiplets. Therefore, no excited state absorption...
The key consideration in heat treatment model is phase transformation kinetics under non-isothermal cooling. In this study, a program is developed to predict austenite transformation by kinetics model under non-isothermal conditions. For doing so, the classical additivity rule and Avrami-type rate equation is evaluated to handle the phase kinetics under non-isothermal conditions. And comparing with...
Based on the theory of percolation, we develop a general model to simulate soft and hard breakdown of gate oxides. In this paper, we model the effect of the constant stress in reliability tests as a constant defect generation rate to simulate the time dependent dielectric breakdown. We show that the soft and hard breakdown are the results of two different natures of phase transitions, critical and...
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