论文部分内容阅读
具有β—W(A15)型晶体结构的金属化合物V_3Ga拥有较高的超导转变温度(根据不同的研究数据为14.5—16.5°K),很高的上临界磁场(210—250KG),和很高的临界电流密度。在一些文献中介绍了V—Ga系相平衡图。事实表明,具有体心立方晶格的镓在钒中的固溶体形成了宽阔的单相区(51%Ga以下,原子百分比),而化合物V_3Ga是呈固态于1350℃生成的。加入各种元素进行合金化,研究其对化合物V_3Ga超导性能的影响,无论从科学方面还是对解决可能的工艺任务来说都是很有意思的。文献中曾经研究过许多元素添加剂对化合物V_3Ga临界温度的影响。文献中指出,在全部的研究工作中合金化都降低了临界温度,並且临界温度的降低照例因添加元素在周期表中的位置不同而不同。然而在文献中发现,添加硅铝稍微提高了临界温度(其值为～0.4°K)。文献的作者们在研究合金化合导致临界温度的变化时:在某些情况下显然没有考虑到合金的结构和相组成。而它们在以各种元素的任何原子组份进行合金化时却可能是完全不同的。本文研究了V_3Ga—Me型合金的结构和相组成的变化,这里Me代表周期表中Ⅲ一Ⅷ族的元素。如同文献一样,在维持比例V:Ga=3:1的情况下,加入其量为5%Me(原子百分比,下同)的合金添加剂。
The metal compound V_3Ga having a β-W (A15) -type crystal structure has a higher superconducting transition temperature (14.5-16.5 ° K depending on the research data), a very high upper critical magnetic field (210-250 KG), and a very high High critical current density. V-Ga phase equilibrium diagrams have been introduced in some documents. The fact indicates that the solid solution of gallium in vanadium with a body-centered cubic lattice forms a wide single-phase region (51% Ga or less in atomic percent) and the compound V_3Ga is formed in a solid state at 1350 ° C. Adding various elements for alloying and studying their influence on the superconducting properties of the compound V_3Ga are of great interest both in science and in solving possible process tasks. The literature has studied the effect of many elemental additives on the critical temperature of compound V_3Ga. It is pointed out in the literature that alloying reduces the critical temperature for all research work and that the reduction in the critical temperature, as a rule, differs depending on the positions of the added elements in the periodic table. However, it has been found in the literature that the addition of aluminosilicate slightly increases the critical temperature (which is ~ 0.4 ° K). The authors of the literature, while studying the alloying reaction leading to changes in the critical temperature: in some cases apparently did not consider the structure and phase composition of the alloy. And they may be completely different when alloying with any atomic element of the various elements. In this paper, V_3Ga-Me-type alloy structure and phase composition changes, where Me represents the periodic table Ⅲ a Ⅷ elements. As in the literature, an alloy additive in an amount of 5% Me (atomic%, same below) was added while maintaining the ratio V: Ga = 3: 1.