Optical constants of some silver alloys

C. J. Flaten, E. A. Stern

Research output: Contribution to journalArticlepeer-review

32 Scopus citations


The optical constants between 1.40 and 5.25 eV of three disordered alloy systems, AgCd, AgMg, and AgSn, have been directly measured over their respective -phase ranges. The measurements indicate that the onset of the L2-L1 transitions in pure Ag occurs at 3.33 0.08 eV. The measurements clearly show the delineation of the alloys into two classes, one called class A, where the formalism of periodic structures with direct optical transitions is applicable, and one called class B, where this formalism is not applicable, and indirect optical transitions dominate in the changes caused by alloying. The plasma frequency in the Drude region is found to be a constant for these alloys within experimental error. For both of the class-A alloys, AgMg and AgCd, the electronic structure is very similar and a non-rigid-band variation of energy levels is found which can be qualitatively understood in terms of alloy theory. AgSn is a class-B alloy, the understanding of which is more difficult.

Original languageEnglish
Pages (from-to)638-650
Number of pages13
JournalPhysical Review B
Issue number2
StatePublished - 1975
Externally publishedYes


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