Investigation of dislocations in 8circ off-axis 4H-SiC epilayer

This paper reports that the etching morphology of dislocations in 8^circ off-axis 4H-SiC epilayer is observed by using a scanning electronic microscope. It is found that different types of dislocations correspond with different densities and basal plane dislcation (BPD) array and threading edge dislocation (TED) pileup group lie along some certain crystal directions in the epilayer. It is concluded that the elastic energy of threading screw dislocations (TSDs) is highest and TEDs is lowest among these dislocations, so the density of TSDs is lower than TEDs. The BPDs can convert to TEDs but TSDs can only propagate into the epilyer in spite of the higher elastic energy than TEDs. The reason of the form of BPDs array in epilayer is that the big step along the basal plane caused by face defects blocked the upstream atoms, and TEDs pileup group is that the dislocations slide is blocked by dislocation groups in epilayer.     

Investigation of dislocations in 8° off-axis 4H-SiC epilayer

This paper reports that the etching morphology of dislocations in 8° off-axis 4H-SiC epilayer is observed by using a scanning electronic microscope.It is found that different types of dislocations correspond with different densities and basal plane dislcation (BPD) array and threading edge dislocation (TED) pileup group lie along some certain crystal directions in the epilayer.It is concluded that the elastic energy of threading screw dislocations (TSDs) is highest and TEDs is lowest among these dislocations,so the density of TSDs is lower than TEDs.The BPDs can convert to TEDs but TSDs can only propagate into the epilyer in spite of the higher elastic energy than TEDs.The reason of the form of BPDs array in epilayer is that the big step along the basal plane caused by face defects blocked the upstream atoms,and TEDs pileup group is that the dislocations slide is blocked by dislocation groups in epilayer.     

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介绍了拟建的高温高压氦气实验回路的主要目标、特征以及回路中各设备的性能、参数,应用RELAP5程序完成了回路的热工设计分析,CAESAR程序优化了管路和设备的布置及应力分析,结果表明设计具备工程可行性。     

Atomic force microscopy studies on liquid inclusions and induced defects of cadmium mercury thiocyanate crystal

Liquid inclusions and various defects accordingly induced on a nonlinear optical material of CMTC crystal were investigated by atomic force microscopy. Liquid inclusions are chiefly caused by formation of macrosteps, which result from impurity‐induced inhibiting of step growth and meeting of step trains advancing along different directions. Liquid inclusions induce generation of dislocations and even cracks within the crystal by three‐dimensional nucleation growth. Liquid inclusions also provide screw dislocation growth sources, leading to formation of spiral hillock trains with ridged tails. Etching experiments reveal circular hollow cores, indicative of screw dislocation growth, and negative crystals resulting from further crystallization in the liquid inclusions. (© 2003 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)     

Porous Magnesium Oxide by Twin Polymerization: From Hybrid Materials to Catalysis

Twin monomers [Mg(2-OCH₂-^cC₆H₄O)][L]_0.8 ( 2 , L=diglyme) and [Mg(2-OCH₂-^cC₆H₄O)][L]_0.66 ( 3 , L=tmeda) form by their thermal polymerization interpenetrating organic-inorganic hybrid materials in a straightforward manner. Carbonization (Ar) followed by calcination gave porous MgO ( 2 : surface area 200 m² g⁻¹, 3 : 400 m² g⁻¹), which showed in catalytic studies towards Meerwein-Ponndorf-Verley reductions excellent yields and complete conversions for cyclohexanone and benzaldehyde. However, with crotonaldehyde a mixture of C₄–C₈ compounds was obtained. When MgO was exposed to air then primarily crotyl alcohol was formed. The range of applications could be easily extended by twin polymerization of 3 in presence of [Cu(O₂CCH₂O(CH₂CH₂O)₂Me)₂] ( 4 ) or [Ag(O₂CCH₂-^cC₄H₃S)(PPh₃)] ( 5 ), resulting in the formation of nanoparticle-decorated porous CuO@MgO or Ag@MgO materials, which showed high catalytic reactivity towards the reduction of methylene blue.