Papers by Author: Paweł Zięba

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Authors: Gabriel A. López, Paweł Zięba, W. Sigle, Eric J. Mittemeijer
1230
Authors: Vera G. Sursaeva, Paweł Zięba
Abstract: The experimental results on motion of single grain boundaries (GBs) of natural mechanical twin and single fabricated twin GBs as well as on fabricated twin GBs in system with triple junction (TJ) are obtained. The mobility of natural mechanical twin GBs, fabricated single GBs and fabricated GBs with TJ are compared. For the first time the effect of detachment of moving TJ and single natural twin GB from adsorbed atoms is reported. The results on single GB migration are considered in context of triple junction migration as the step to grain growth, i.e. “polycrystal” experiments.
578
Authors: Joanna Wojewoda, Paweł Zięba, Anna Wierzbicka
1188
Authors: Bogdan Datsko, Vitaliy Meleshko, Ivan Mohylyak, Zbigniew Świątek, Lidia Lityńska-Dobrzyńska, Paweł Zięba
Abstract: At uniform excitation of semiconductors by laser radiation with pre-threshold power, locally melted regions are formed on irradiated surfaces. This is induced by thermo diffusive instability of a distribution of uniformly generated electron-hole plasma. The shapes of locally melted regions give rise to a great variety of interesting surface patterns. A mathematical model of the surface dynamics, when the instability of the melt front arises along a chosen wave vector, is proposed. The results of computer simulation of interface dynamics of solitary melted region are compared with experimental data.
137
Authors: R.E. Schacherl, Paweł Zięba, Eric J. Mittemeijer
1270
Authors: Paweł Zięba
Abstract: The paper provides a short state of art in the field of diffusion processes at moving grain boundaries (reaction front) at the example of discontinuous solid state reactions. Main emphasis is put on the stop- and go behaviour and its consequences, the role of local characterisation of the discontinuous reactions and the concept of dynamic segregation in the explanation of existing divergences concerning the rate of diffusion at the stationary and moving boundary. Finally, some unsolved problems and perspective for the future research are presented.
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