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Observations on Defects in Zone-melting-recrystallized Si Films刘安生,邵贝羚,袁建明摘 要:<正> We have observed some kinds of defects in unseeded rapid zone-melting-recrystallized(RZMR)Si filmsformed with a RF-induced graphite strip heater system,using cross-section specimen electron microscope.Theobserved defects are subgrain boundaries(SGB),dislocations......
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Growth, Optical Properties and Defects of High-Doped Yb∶YAl3(BO3)4 Crystal Wang Xuping1,Liang Ximin1,Wang Jiyang1,Zhao Hongyang1,Li Jing1,Zhang Huaijin1 (1.State Key Laboratory of Crystal Materials... of the Yb3+ concentration, the main absorption and fluorescence peaks almost do not change, but the absorption coefficient and FWHM increase. The defects were investigated by using chemical etching method......
Determination of Ring-OSF Position in Czochralski Silicon Single Crystals by Numerical Analysis of Distribution of Grown-in Defects Kazuhiko Kashima1,Yasutada Nakagawa2,Sunao Abe3,Takahiro Terada2... Voronkov''s model were examined and used to estimate the distribution of defects during crystal growth. By comparisons of the distribution of the density of LSTD and the position of R-OSF in non-nitrogen......
Vanadium Defects Formation Mechanism in Undoped GaN Grown on Silicon Hao Qiuyan1,Zhang Wei1,Teng Xiaoyun1,Sun Shilong1,Liu Caichi1,Zhao Liwei1 (1.School of Material Science and Engineering, Hebei University of Technology, Tianjin 300130, China) Abstract:V defects in GaN layer grown on Si (111) using metalorganic chemical vapor deposition (MOCVD) were investigated by atomic force microscopy......
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casting processes have been used widely for complex automotive products such as knuckle, arm, etc. Usually, a part fabricated by casting has limited strength due to manufacturing defects... by experiment and by simulation using DEFORM 3D, are present. Key words: rheo-forging; A356 alloy; formability; forming defects 1 Introduction Rheological material forming is a near-net-shape forming......
First-principles Study of Point Defects in Stoichiometric and Non-stoichiometric Y4Al2O9Z.Li1,B.Liu1,J.M.Wang1,L.C.Sun1,J.Y.Wang1,Y.C.Zhou2,Z.J.Hu21. High-performance Ceramics Division,Shenyang...="ChDivSummary">By using the first-principles calculation,we studied the mechanisms of point defects in Y4Al2O9(YAM),a promising ternary oxide with excellent optical and thermal properties.It is found......
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