评述了Ag与RE金属相互作用与合金化行为.随着镧系元素原子序数增大,RE在Ag中固溶度增大;RE与Ag原子半径差(Δr/rAg)是影响RE在Ag中固溶度的主要因素:当Δr/rAg>26%时,Cmax很小或为零;当Δr/rAg<26%时,Cmax=A-B(logΔr/rAg-1).在Ag-RE系中出现(RE∶Ag)1∶5、2∶9、1∶4、14∶51、2∶7、1∶3、1∶2、1∶1、3∶2和5∶2十种化学计量化合物和19种晶体结构,4个共晶系10种共晶反应和8种包晶反应.根据简约温度图,评述了简约共晶温度和中间相简约转变温度与RE原子序数的关系:随着RE原子序数增大,简约温度有规律下降,但在Ce、Eu和Yb上出现反常高值.简约共晶温度(Teu/TAg)与RE原子半径的关系符合由Au-RE系建立的判据:Teu/TAg随RE原子半径增大而线性降低,但当rRE大于0.175nm(原子半径差大于21%)后Teu/TAg基本保持不变.在Ag-RE系中,Eu和Yb取2价态,其它RE取3价态.
参考文献
| [1] | Gschneidner Jr K A;Caldewood F W .[J].Bulletin of Alloy Phase Diagrams,1983,4(04):364-377. |
| [2] | Gschneidner Jr K A;Calderwood F W .[J].Bulletin of Alloy Phase Diagrams,1985,6(05):439. |
| [3] | Gschneidner Jr K A;Calderwood F W .[J].Bulletin of Alloy Phase Diagrams,1985,6(01):15-23. |
| [4] | Gschneidner Jr K A;Calderwood F W .[J].Bulletin of Alloy Phase Diagrams,1985,6(02):138-143. |
| [5] | Gschneidner Jr K A;Calderwood F W .[J].Bulletin of Alloy Phase Diagrams,1983,4(04):364. |
| [6] | Okamoto H .[J].Journal of Phase Equilibria,1991,12(03):390. |
| [7] | Rider P E;Gschneidner Jr K A;Mcmaster O D .[J].Transactions of the Metallurgical Society of AIME,1965,233:1488. |
| [8] | 宁远涛.[J].贵金属 |
| [9] | Gschneidner Jr K A;Mcmaster O D;Alexander D G et al.[J].Metallurgical and Materials Transactions,1970,1:1961. |
| [10] | Gschneidner Jr K A;Subbarao E C;Wallace W E.Science and Technology of Rare Earth Materials[M].Academic press,1980:51. |
| [11] | Chelikowsky J R .[J].Physical Review B,1979,19(02):686. |
| [12] | Mcmaster O D;Gschneidner Jr K A;Venteicher R F .[J].Acta Crystallographica Section B-Structural Science,1970,26:1224. |
| [13] | Delfino S;Ferro R;Capelli R et al.[J].Journal of the Less-Common Metals,1975,41:59. |
| [14] | Heumann T;Preval A .[J].Journal of the Less-Common Metals,1980,76:263. |
| [15] | Stapf I;Jehn H .[J].Journal of the Less-Common Metals,1983,92:167. |
| [16] | Ferro R;Defino S .[J].Journal of the Less-Common Metals,1979,68:23. |
| [17] | Iandelli A;Palenzona A;Gschneidner Jr K A;Eyring L.Handbook on the Physics and Chemistry of Rare Earths[M].North-Holland Publishing Company,1979:2. |
| [18] | Ferro R;Delfino S;Capelli R et al.[J].Journal of the Less-Common Metals,1975,42:13. |
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