Substitutional adsorption of Li on Al: The structure of the Al(111)-(3×3)R30

Substrate-mediated interaction and electron-induced diffusion of single lithium atoms on Ag(001)

“…22 Furthermore, the substitutional adsorption for Li on Al͑111͒ and the structure of the Al͑111͒-͑ ͱ 3 ϫ ͱ 3͒R30°-Li phase at room temperature have been determined by LEED. 23 Similar results are obtained by LEED and scanning-tunneling microscopy ͑STM͒ for Li adsorption on Cu͑001͒ at room temperature. It has been shown that depending on the coverage, different two-dimensional surface alloys are formed, which is manifested in a structural change from a ͑2 ϫ 1͒ to ͑3 ϫ 3͒ and ͑4 ϫ 4͒ superstructures.…”

Surface structure of K/Pd(100) and the effect of H coadsorption: Density functional theory calculations

“…AM adsorbates modify the substrate structure. Sometimes, rather significant structural changes such as noticeable reconstruction or surface alloy formation take place as reported for the cases of Li and Na on Al surfaces [1][2][3] and Li on Cu(1 0 0) surface [4]. In many cases, however, relatively small modifications such as surface relaxation and substrate rumpling have been reported [5] as found for example in the K/Ni(1 0 0)-c(4 · 2) [6], Na/ Ni(1 0 0)-c(2 · 2) [7], and Na/Cu(1 0 0)-c(2 · 2) surfaces [8].…”

Surface phonons on Al(111) surface covered by alkali metals

“…13 The substitutional adsorption for 1 / 3 ML of lithium on the Al͑111͒ surface was first suggested by Nagao et al 17 from measurements of the vibrational spectrum of this system. Then, using low-energy electrondiffraction measurements 18 it was shown that Li adsorption leads to the formation of a binary surface alloy Al͑111͒-͑ ͱ 3 ϫ ͱ 3͒R30°-Li which structure was found to be qualitatively the same as the corresponding Na phase. The similar results have also been obtained for 1 / 3 ML of potassium on the Al͑111͒ surface.…”