钯与周期表元素相互作用及固溶度分析  

Alloying Characteristics and Solid Solubilities of Periodic Table Elements in Palladium

作　　者：宁远涛[1] 

机构地区：[1]昆明贵金属研究所稀贵金属综合利用新技术国家重点实验室,昆明650106

出　　处：《贵金属》2014年第4期1-5,共5页Precious Metals

摘　　要：总结了周期表元素与Pd的相互作用,按富Pd合金的相图特征,采用经典合金化理论和米德玛键参数分析了固溶度的规律性。建立了周期表元素在Pd中的溶解度方程:ln Cmax=4.6052–k(|△nws1/3|–nR),溶质在Pd溶剂中的极限固溶度(ln Cmax)是Pd溶剂与溶质之间的电子密度差|△nws1/3|的减函数。当Pd溶剂与溶质之间的电子密度差|△nws1/3|相同时,简单金属溶质在Pd中的固溶度大于过渡金属溶质,简单金属和过渡金属溶质在Pd溶剂中具有不同的固溶机制。分析了以各贵金属元素作为溶剂对周期表元素的溶解能力指数与溶质元素电子密度nws1/3的关系,Pd作为溶剂对周期表元素具有最大溶解能力。Some regularities of interactions of palladium with periodic table elements were summarized, and the solid solub ilities of periodic table elements in palladium were analyzed by the classical solid solubility theory and Miedema＇s bond parameters. A solubility equation, ln Cmax =4.6052–k（｜△nws^1/3｜– nR）, was established, the limit solid solubility（ln Cmax）, of solutes in palladium increases with the electron density difference, ｜△nws^1/3｜, between them. The solid solubilities of the simple metal solutes in palladium are larger than those of transition metal solutes with same △nws^1/3 based on different solubility mechanisms. The relationship of solvability ability indexes of precious metals as solvents with their electron density nws^1/3 were analyzed by their electron density parameters nws^1/3, and the palladium solvent has the largest solubility ability index for periodic table elements as solutes.

关 键 词：金属材料 合金化原理 固溶度 米德玛键参数 溶解度方程 

分 类 号：TG146.36[一般工业技术—材料科学与工程] TG111.5[金属学及工艺—金属材料]