Factors influencing the formation of silver-rich solid solutions in rare-earth-silver alloy systems
Factors influencing the formation of silver-rich solid solutions in rare-earth-silver alloy systems
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DOI：
10.1007/bf02642796
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发表时间：
1970
期刊：
影响因子：
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通讯作者：
K. Gschneidner;O. Mcmasters;D. G. Alexander;R. Venteicher
中科院分区：
文献类型：
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作者：
K. Gschneidner;O. Mcmasters;D. G. Alexander;R. Venteicher
用X射线参量法测定了所有天然稀土金属在银中的固溶度。溶解度范围为0.01 ~ 0.02at. 5%.富银化合物的化学计量和它们的一些晶体结构进行了测定。在这项研究中发现的富银化合物是：RAg 5（La，Ce，Pr，Eu和Yb），RAg 4（Lu和Sc），R14 Ag 5l（La到Sm，Gd到Er，Yb和Y）和TmAg 3。测定了银/富银化合物的共晶温度。这些数据的分析表明，除了休谟-Rothery标准的几个因素影响的形成和程度的固溶体。这些包括如果纯金属尺寸差小于22 - 25%的临界值，溶剂和溶质的尺寸和电负性的相互调节，第一富溶剂化合物的组成，和溶剂的晶格刚性。
The solid solubilities of all of the naturally occurring rare-earth metals in silver have been determined by using the X-ray parametric method. The solubilities range from 0.01 to 0.02 at. pct for Eu to 10.5 at. pct for Sc. The stoichiometries of the silver-rich compounds and some of their crystal structures were determined. The silver-rich compounds found in this study are: RAg5(La, Ce, Pr, Eu, and Yb), RAg4(Lu and Sc), R14Ag5l(La to Sm, Gd to Er, Yb, and Y) and TmAg3. The silver/silver-rich compound eutectic temperatures were also determined. Analysis of these data indicates that several factors in addition to the Hume-Rothery criteria influence the formation and extent of solid solutions. These include the mutual adjustment of size and electronegativity of the solvent and solute if the pure metal size differences are less than a critical value of 22 to 25 pct, the composition of the first solvent-rich compound, and the lattice rigidity of the solvent.