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characteristic lattice parameter
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  相似匹配句对
     It has the characteristic of parameter driving .
     该系统具有参数驱动之特点。
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     Activated Sludge Characteristic Parameter
     活性污泥特性参数——还原条件下NO_2—N生成特性曲线
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     The Topological Characteristic in the Help Lattice
     助格的拓扑特征
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     The lattice parameter increases with B content increasing.
     合金的晶格常数随B含量的增加呈现上升趋势;
     A characteristic Property of Lattice-ordered group
     格序群的一个特征性质
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The variation of lattice parmeters across a solid solution range between two isostructural elements has been expressed in Vegard's law which is so seldom obeyed. Numerous attempts have been made to explain its failure, but the factor mainly responsible for deviations from the law has not yet been considered. In the present work, we have pointed out that the varia- tion of atomic states of solute and solvent with changes of nearest- neighbour environments is the predominating influence on the deviations...

The variation of lattice parmeters across a solid solution range between two isostructural elements has been expressed in Vegard's law which is so seldom obeyed. Numerous attempts have been made to explain its failure, but the factor mainly responsible for deviations from the law has not yet been considered. In the present work, we have pointed out that the varia- tion of atomic states of solute and solvent with changes of nearest- neighbour environments is the predominating influence on the deviations from the law. According to the fact that there is an intrinsic characteris lattice parameter for a certain crystal structure and a certain composition of the hybridization state, we have established two laws calculating the lattic eparameter of a solid solution: 1) generalized Vegard's law which means that the lattice parameter of a solid solution is equal to the sum of the products of the characteristic lattice parameters of the individual atomic hybridization states and their corresponding atomic concentrations, a = multiply multiply C_i, j a_i, 1. i j 2) generalized Yu's law which means that the lattice parameter of a solid solution is equal to that of the average atomic hybridization state of the solute and solvent, a = G{ multiply multiply 2 C_i, j R_i, j -β lg [multiply multiply C_i, jn_i~C, j / (A + Be~(-Ea) / β)]}. If the C_i, j, Ri, j are hnown, the lattice parameter of a solid solution can be calculated at any concentration. We have calculated the lattice parameter curve of Au-Cu system as a function of the atomic concentration. It has been shown that the agreement between observed and calculated lattice parameters of Au-Cu alloys is good when two laws are used. The magnitude calculated by generalized Vegard's law is slightly greater than that by generalized Yu's law, but the maximum discrepance is less than 0.001 A. Because the atomic hybridization states of Au and Cu alloyed are splitted in the directions of h states which have relatively big characteristic lattice parameters as compared with their single subs- tances, the lattice parameter curve of the Au-Cu system as a function of composition is convex upward.

本文指出,Vegard定律与实际情况不符的根本原因在于它没有考虑到溶质和溶剂原子在固溶体中由于近邻原子的不同而引起原子电子结构状态的变化。此文在考虑了原子状态的变化和确定的原子状态具有固有的特征晶格参量基础上,提出了广义Vegard定律和广义余氏定律。在Au-Cu合金中,Au和Cu原子的价电子状态向h态方向分裂,从而形成向上凸的a—c曲线。按新堤出的广义Vegard定律和广义余氏定律计算的a—c理论曲线与实验结果极为一致。

On the basis of the new concepts of the characteristic state and characteristic lattice parameter,and of the sum law for characteristic lattice parameter-generalized Vegard′s law,we have deduced a normative equation of a-c curve for the regular solid solutions,a=(1-c)a_(1.0)+ca_(2,J)+c(1-c)[a_(1,J)-a_(1,0))+(a_(2,J)-a_(2,0))].The condition of the existence of the extreme value for a-c curve has been discussed.Taking Au-Ag alloy system as an example,an analysis method of valence electron structure...

On the basis of the new concepts of the characteristic state and characteristic lattice parameter,and of the sum law for characteristic lattice parameter-generalized Vegard′s law,we have deduced a normative equation of a-c curve for the regular solid solutions,a=(1-c)a_(1.0)+ca_(2,J)+c(1-c)[a_(1,J)-a_(1,0))+(a_(2,J)-a_(2,0))].The condition of the existence of the extreme value for a-c curve has been discussed.Taking Au-Ag alloy system as an example,an analysis method of valence electron structure of continuous solid solutions has been introduced.

本文基于溶质和溶剂原子的特征态和特征晶格参量的新概念,以及特征晶格参量迭加定律——广义Vegard定律,导出了规则固溶体a-c曲线的一个标准方程:a=(1-c)a_(1,0)+ca_(2,J)+c(1-c)[(a_(1,J-a_(1,0))+(a_(2,J)-a_(2,0))];就a-c曲线极值存在的条件进行了讨论;并以Au-Ag系为例,介绍了一种最简单的连续固溶体价电子结构的分析方法。

 
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