Optical constants of some silver alloys
- 15 January 1975
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 11 (2), 638-650
- https://doi.org/10.1103/physrevb.11.638
Abstract
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 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 , where the formalism of periodic structures with direct optical transitions is applicable, and one called class , 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- 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- alloy, the understanding of which is more difficult.
Keywords
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