The outer valence electron momentum distributions of benzene are reinvestigated with theoretical calculations involving the vibrational effects.The results are compared with recent experimental measurements[Phys.Rev.A...The outer valence electron momentum distributions of benzene are reinvestigated with theoretical calculations involving the vibrational effects.The results are compared with recent experimental measurements[Phys.Rev.A 98042705(2018)].The significant discrepancies between theories and experiments in previous works have now been interpreted quantitatively,indicating that the vibrational motion in benzene molecule has noticeable influence on its electron momentum distributions.展开更多
The corrosion resistance and mechanical properties were tested and compared for the newly synthesized as-cast,as-solution Ni-Cr-Mo-Cu corrosion resistant alloys and 1Cr18Ni9Ti austenitic stainless steel. Their valence...The corrosion resistance and mechanical properties were tested and compared for the newly synthesized as-cast,as-solution Ni-Cr-Mo-Cu corrosion resistant alloys and 1Cr18Ni9Ti austenitic stainless steel. Their valence electron structural units were constructed,and the relative parameters were calculated by means of the Empirical Electron theory of Solids and Molecules(EET). The results show that,during alloy elements Cr,Mo and Cu entering Ni-matrix,the bonding strength nA and bonding energy EA of the strongest bond of the alloy are greatly increased,causing the stronger solid solution strengthening effects(about 30% increase in σb). Also,as reinforcement of the main bond network and the improvement of stability of the alloy system due to the solution of these alloying elements in γ-Ni,the ionization of metal atoms in corrosion solution and the flow of electrons from anode to cathode would all be impeded during electro-chemical corrosion processes,which leads to the excellent corrosion resistant ability of the present Ni-Cr-Mo-Cu alloy(about 2-3 orders of magnitude as high as 1Cr18Ni9Ti austenitic stainless steel) in several highly aggressive solutions.展开更多
H. I. Aaronson school proposed Drag-like Effect and they took the activity of carbon in γ-Fe as a criterion to explain the formation of 'Bay' in C-curves of phase transformation kinetics of alloys. This work ...H. I. Aaronson school proposed Drag-like Effect and they took the activity of carbon in γ-Fe as a criterion to explain the formation of 'Bay' in C-curves of phase transformation kinetics of alloys. This work employs Yu’s 'Empirical electron theory of solids and molecules' and C-Me segregation as a criterion to set forth the nature of drag-like effect and proposes the model of valence electron theory of 'Bay' formation.展开更多
The Ni80Nb20 films were prepared by ion beam assisted deposition (IBAD) with various Ar+ ion energies. A phase evolution of fcc→amorphous→Ni+Nb→Ni+hcp was observed with the increasing of ion beam energy from 2 keV ...The Ni80Nb20 films were prepared by ion beam assisted deposition (IBAD) with various Ar+ ion energies. A phase evolution of fcc→amorphous→Ni+Nb→Ni+hcp was observed with the increasing of ion beam energy from 2 keV to 8 keV. When bombarded by Ar+ ions of 8 keV during deposition, a new crystalline phase with hcp structure was obtained, of which the lattice parameters are a=0.286 nm and c=0.483 nm, different from those of the similar A3B-type hcp phase previously reported. The experimental results were discussed in terms of thermodynamics and restricted kinetic conditions in the far-from-equilibrium process of IBAD. The formation of hep phase may also be related to the valence electron effect.展开更多
基金Project supported by the National Key Research and Development Program of China(Grant No.2017YFA0402300).
文摘The outer valence electron momentum distributions of benzene are reinvestigated with theoretical calculations involving the vibrational effects.The results are compared with recent experimental measurements[Phys.Rev.A 98042705(2018)].The significant discrepancies between theories and experiments in previous works have now been interpreted quantitatively,indicating that the vibrational motion in benzene molecule has noticeable influence on its electron momentum distributions.
基金Project (SKL05011) supported by the Foundation of State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials, China
文摘The corrosion resistance and mechanical properties were tested and compared for the newly synthesized as-cast,as-solution Ni-Cr-Mo-Cu corrosion resistant alloys and 1Cr18Ni9Ti austenitic stainless steel. Their valence electron structural units were constructed,and the relative parameters were calculated by means of the Empirical Electron theory of Solids and Molecules(EET). The results show that,during alloy elements Cr,Mo and Cu entering Ni-matrix,the bonding strength nA and bonding energy EA of the strongest bond of the alloy are greatly increased,causing the stronger solid solution strengthening effects(about 30% increase in σb). Also,as reinforcement of the main bond network and the improvement of stability of the alloy system due to the solution of these alloying elements in γ-Ni,the ionization of metal atoms in corrosion solution and the flow of electrons from anode to cathode would all be impeded during electro-chemical corrosion processes,which leads to the excellent corrosion resistant ability of the present Ni-Cr-Mo-Cu alloy(about 2-3 orders of magnitude as high as 1Cr18Ni9Ti austenitic stainless steel) in several highly aggressive solutions.
基金Project supported by the National Natural Science Foundation of China.
文摘H. I. Aaronson school proposed Drag-like Effect and they took the activity of carbon in γ-Fe as a criterion to explain the formation of 'Bay' in C-curves of phase transformation kinetics of alloys. This work employs Yu’s 'Empirical electron theory of solids and molecules' and C-Me segregation as a criterion to set forth the nature of drag-like effect and proposes the model of valence electron theory of 'Bay' formation.
基金The work was supported in part by the National Natural Sci ence Foundation of China(No.19875027)The Ministry of Science and Technology of China(No.G200067207-1),by the Adninistration of Tsinghua University.
文摘The Ni80Nb20 films were prepared by ion beam assisted deposition (IBAD) with various Ar+ ion energies. A phase evolution of fcc→amorphous→Ni+Nb→Ni+hcp was observed with the increasing of ion beam energy from 2 keV to 8 keV. When bombarded by Ar+ ions of 8 keV during deposition, a new crystalline phase with hcp structure was obtained, of which the lattice parameters are a=0.286 nm and c=0.483 nm, different from those of the similar A3B-type hcp phase previously reported. The experimental results were discussed in terms of thermodynamics and restricted kinetic conditions in the far-from-equilibrium process of IBAD. The formation of hep phase may also be related to the valence electron effect.
