scholarly journals Correlations between the valence electron structure and melt pointing and cohesive energies of rare earth metals

2012 ◽  
Vol 61 (10) ◽  
pp. 107101
Author(s):  
Meng Zhen-Hua ◽  
Li Jun-Bin ◽  
Guo Yong-Quan ◽  
Wang Yi
Keyword(s):  
Rare Earth ◽  
Valence Electron ◽  
Rare Earth Metals ◽  
Electron Structure ◽  
Valence Electron Structure ◽  
Cohesive Energies

Effect of Rare Earth Elements on the Valence Electron Structure and Properties of ZrB2 Ceramics

2009 ◽  
Vol 1 (3) ◽  
pp. 269-275 ◽  
Author(s):  
Jinping Li ◽  
Jiecai Han ◽  
Songhe Meng ◽  
Xiaoguang Luo ◽  
Shanliang Dong
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Valence Electron ◽  
Electron Structure ◽  
Structure And Properties ◽  
Valence Electron Structure

Effects of Transition Metals and Rare Earths on Iron-Carbon Micro Electrolysis Degrading Dyeing Effluent

2014 ◽  
Vol 1010-1012 ◽  
pp. 928-933
Author(s):  
Ju Chi Kuang ◽  
Xiao Gang Chen ◽  
Min Hua Chen
Keyword(s):  
Rare Earth ◽  
Rare Earths ◽  
Valence Electron ◽  
Zero Valent Iron ◽  
Effluent Treatment ◽  
Related Factors ◽  
Valence Electron Structure ◽  
Iron Catalysis ◽  
Orthogonal Experiments ◽  
Dyeing Effluent

The principle and methodology of effluent treatment by iron-carbon micro electrolysis were introduced in the paper. Then design of the orthogonal experiments for dyeing effluent treatment was formulated. Discussion of influences of related factors on effluent treatment followed. Results were got after the detailed analysis. Therefore, we deduced the mechanism that the cations of Transition Metal (TM) and rare earth (RE) assist of zero-valent irons catalyzing degradation of dyeing effluent. The mechanism is formed based on the following explanation. Cations of manganese and cobalt easily penetrate Fe0lattices, while Ce4+cations do it difficultly because of their larger radius. Thus Ce4+is weaker than both of Mn2+and Co2+for helping zero-valent irons to improve their activity. Furthermore, because the valence electron structure of Mn2+is more stable than that of Co2+, Mn2+is better for assisting zero-valent iron catalysis of degradation of dyeing effluent than Co2+. Therefore, ranking of influence for zero-valent iron catalysis activity from greatest to smallest is Mn2+, Co2+and Ce4+.

The valence electron structure and properties analysis of TiC

2001 ◽  
Vol 46 (12) ◽  
pp. 1002-1004 ◽  
Author(s):  
Huanrong Wang ◽  
Yifu Ye ◽  
Guanghui Min ◽  
Jingyu Qin ◽  
Weimin Wang
Keyword(s):  
Valence Electron ◽  
Electron Structure ◽  
Structure And Properties ◽  
Valence Electron Structure

INTERFACE ELECTRON STRUCTURE OFTiC–NiAlCOMPOSITES

2012 ◽  
Vol 19 (05) ◽  
pp. 1250056
Author(s):  
X.-F. TIAN ◽  
W.-K. ZHANG ◽  
Y. QI
Keyword(s):  
Electron Density ◽  
Valence Electron ◽  
Electron Structure ◽  
Matrix Composites ◽  
Communication Interface ◽  
Valence Electron Structure ◽  
Valence Electron Density ◽  
Intermetallic Matrix ◽  
Intermetallic Matrix Composites ◽  
Set Up

Intermetallic matrix composites reinforced with ceramic particles such as TiC have received increasing attention in recent years due to the combined potential of ceramics and intermetallics to give a desirable balance of properties. But an understanding of some experimental results presented elsewhere has remained elusive. In this communication, interface valence electron structure of TiC–NiAl composites was set up on the basis of Pauling's nature of the chemical bond, and valence electron density ρ of different atomic states TiC and NiAl composites in various planes was determined. From the viewpoint of biphase interface electron density continuing, the corresponding experimental phenomena are explained.

Valence Electron Theoretical Analysis of Mechanical Properties in Low-Alloy Steel

2011 ◽  
Vol 704-705 ◽  
pp. 389-394
Author(s):  
Chuan Sun ◽  
Yun Kai Li ◽  
Lin Jiang
Keyword(s):  
Mechanical Properties ◽  
Alloy Steel ◽  
Valence Electron ◽  
Electron Structure ◽  
Structure Parameters ◽  
Low Alloy Steel ◽  
Valence Electron Structure ◽  
Empirical Electron Theory ◽  
Valence Electrons ◽  
Set Up

The mechanical properties in low-alloy steel are studied systematically from the view of valence electrons using the Empirical Electron Theory in solid and molecules (EET). Two new valence electron structure parameters ρcvand ρlv, which have closely relation with the mechanical properties of alloy steel are summed up according to the basic idea of EET. The values of the two new valence electron structure parameters in carbon steel and alloy steel which contains Cr, Mn, Ni, Si, W and Mo are calculated. The result demonstrates that ρcvhas a very good corresponding relationship with intensity, and ρlvhas a very good corresponding relationship with plasticity. In this note, a quantitative empirical formula between the valence electrons structure and the intensity and plasticity of alloy steel is initially set up. Keywords: EET, valence electron structure, mechanical property, low-alloy steel

Influence of Micro-Addition Chromium on the Valence Electron Structure and Toughness of Fe2B Phase

2010 ◽  
Vol 34-35 ◽  
pp. 1135-1139
Author(s):  
Rui Na Ma ◽  
Yong Zhe Fan ◽  
Xiao Ming Cao ◽  
Ming Wen
Keyword(s):  
Fracture Toughness ◽  
Valence Electron ◽  
Chromium Content ◽  
Electron Structure ◽  
Valence Electron Structure ◽  
Electron Pairs ◽  
Good Corrosion Resistance ◽  
Length Difference ◽  
Fe2b Phase ◽  
Good Agreement

Fe2B is a kind of typical intermetallic compound, which has good corrosion resistance in molten zinc. However, the fatal intrinsic brittleness limits its further application in the Hot-Dip Galvanizing Industry. Therefore, it is worthwhile to improve the toughness of Fe2B phase. In this study, the fracture toughness property of Fe2B phase with and without micro-addition chromium is investigated. In comparison with pure Fe2B phase, the intrinsic brittleness of Fe2B phase with chromium is lower. In addition, the valence electron structure of Fe2B containing various chromium content is calculated by the method of bond length difference (BLD). The results show that, in the (Fe1-x Crx)2B phase, the number of covalent electron pairs and the weaker bond energy are increased by the substituting atom-Cr. The calculated results are in good agreement with experimental observations.

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