Papers by Keyword: Energy Levels

Paper TitlePage

Authors: S. Tanaka, Tetsuo Ikari, H. Kitagawa
171
Authors: A.G. Marinopoulos, P. Santos, J. Coutinho
Abstract: Early transition metals (TMs) of the 3d and 4d rows are undesired contaminants in solar- and electronic-grade Si. From the theoretical standpoint, understanding the properties of these TMs in silicon still remains a challenging problem owing to the strong correlations among the TM d-electrons. The present study proposes a first-principles Hubbard-corrected DFT+U approach, with on-site parameters accounting separately for electron Coulomb (U) and exchange (J) effects. We use this approach together with conventional DFT to determine electrical levels and migration barriers of early 3d (Ti, V and Cr) and 4d (Zr, Nb and Mo) TMs in Si. Comparisons with experimental data allowed us to uniquely assign the deep levels in the gap appraising also the effect of on-site correlation. Our results also resolve existing controversies in the literature concerning the type and origin of the donor levels of Cr and Mo. For all the metals, with the exception of Cr, high barriers of interstitial diffusion are obtained, thus confirming that most of these TMs are slow diffusers in silicon.
264
Authors: S. Voss, Hartmut Bracht, Nicolaas Stolwijk, Helmut Mehrer, Jürgen Wollweber
1141
Authors: Y. Kamiura, K. Fukuda, Y. Yamashita, T. Ishiyama
25
Authors: Antonio Castaldini, Anna Cavallini, Filippo Nava, P.G. Fuochi, P. Vanni
439
Authors: H. Kusanagi, Takashi Sekiguchi, Koji Sumino
1195
Authors: A Ying Zhang, Dong Xing Zhang
Abstract: The effects of thickness and impact energy on the impact damage of CFRP laminates were studied in this paper. Impact tests for the CFRP laminates with the size of 600 mm×700 mm with five different thicknesses were subjected to impact fatigue loading at different energy levels from 5 J to 65 J. The crater depth and matrix length were investigated according to different energy levels and different thicknesses. The impact damage was evaluated by visual inspection, three-dimensional microscope. The experimental results reveal that the crater depth and the crack length increase with the increasing impact energy. For the same impact energy, the crater depth and the crack length decreased with the increasing thickness of specimens.
1060
Authors: A Ying Zhang, Han Xiong Lv, Ye Zhang, Dong Xing Zhang
Abstract: The effects of the impact energy on the impact damage of CFRP laminates were studied in this paper. Impact tests for the CFRP laminates with the size of 600 mm×700 mm were subjected to different the impact energy levels from 5 J to 50 J. The matrix length was investigated according to different energy levels. The experimental results reveal that the crack length increases linearly with the increasing impact energy. The impact damage of CFRP laminates tends to be more severe as impact energy increases, and the impact area and crater depth increases with increasing impact energy. The surface of impact dent of specimen looks like W shape.
850
Authors: L.G. Gerchikov, V.F. Masterov, T.R. Stepanova, H.M. Gibbs, G. Khitrova, N.N. Faleev
1625
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