Optical properties and electronic structure of the Cu-Zn brasses

JOURNAL OF ALLOYS AND COMPOUNDS

卷:647

Article

Keast, V. J.¹  Ewald, J.¹  De Silva, K. S. B.²  Cortie, M. B.²  Monnier, B.^3,4  Cuskelly, D.³  Kisi, E. H.³ 

[1] Univ Newcastle, Sch Math & Phys Sci, Callaghan, NSW 2308, Australia

[2] Univ Technol Sydney, Inst Nanoscale Technol, Broadway, NSW 2007, Australia

[3] Univ Newcastle, Sch Engn, Callaghan, NSW 2308, Australia

[4] Univ Technol Troyes, F-10010 Troyes, France

关键词: Metals and alloys;    Dielectric response;    Density functional theory;    Optical spectroscopy;   

DOI  :  10.1016/j.jallcom.2015.06.136

来源: Elsevier

【 摘 要 】

The color of Cu-Zn brasses range from the red of copper through bright yellow to grey-silver as the Zn content increases. Here we examine the mechanism by which these color changes occur. The optical properties of this set of alloys has been calculated using density functional theory (DFT) and compared to experimental spectroscopy measurements. The optical response of the low Zn content alpha-brasses is shown to have a distinctly different origin to that in the higher content beta', gamma and epsilon-brasses. The response of beta'-brass is unique in that it is strongly influenced by an overdamped plasmon excitation and this alloy will also have a strong surface plasmon response. (C) 2015 Elsevier B.V. All rights reserved.

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