含铅铋系2212相生长动力学研究

Study of the Growth Kinetics of Bi(Pb) 2212 Phase

摘要:

从生长动力学角度研究了（Ｂｉ，Ｐｂ）２Ｓｒ２ＣａＣｕ２Ｏｚｘ超导相反应历程及成相规律。应用差示热分析（ＤＴＡ），Ｘ射线衍射（ＸＲＤ），扫描电镜（ＳＥＭ），能量色散谱仪（ＥＤＳ）等手段详细分析了所得样品的成分、成分改变过程和微观形貌。结果表明：（Ｂｉ，Ｐｂ）２２１２相基层符合按成核生长机理进行的固相反应动力学关系。较大的过度下，长时间的退火处理过程有利于有织构的（Ｂｉ，Ｐｂ）－２２１２相形成。

关键词:相生长动力学 铅铋系2212 过冷度 超导相

Abstract:

The formation and transformation in (Bi,Pb) 2Sr 2CaCu 2O x have been studied from the point of view of growth kinetics. The component, reaction products and microstructures were analyzed by differential thermal analysis (DTA), XRD, SEM and energy dispersive x ray analysis(ED). The results show that the formation process of (Bi,Pb) 2212 phase follows the rules of solid reaction kinetics. For the formation of textured (Bi,Pb) 2212 phase it is advantageous to choose a very high degree of supercooling and relatively long heat treatment time.

Key words:growth kinetics, (Bi,Pb) 2212 phase, formation mechanism, supercooled degree