{"id":157,"date":"2025-08-21T17:57:01","date_gmt":"2025-08-21T15:57:01","guid":{"rendered":"https:\/\/sites.unica.it\/superfici\/?page_id=157"},"modified":"2025-08-21T18:03:21","modified_gmt":"2025-08-21T16:03:21","slug":"electronic-structure","status":"publish","type":"page","link":"https:\/\/sites.unica.it\/superfici\/electronic-structure\/","title":{"rendered":"Electronic structure"},"content":{"rendered":"\n<p><strong>Effect of phosphorus concentration on the electronic structure of Ni-P nanocrystalline alloys<\/strong><\/p>\n\n\n\n<p>A series of electrodeposited nickel-phosphorus alloys ranging from 6 to 29 at% of phosphorus have been analyzed by surface analysis using x-ray photoelectron spectroscopy (XPS) and x-ray excited Auger electron spectroscopy (XAES). It has been found that all the core level binding energies as Ni2p3\/2 and Ni2p1\/2, P2p, P2s as well as the x-ray excited Auger lines NiLMM and PKLL remained constant irrespective of the phosphorus concentration in the alloys. <strong>The only systematic differences observed were<\/strong>: <\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>a) the binding energy of the satellite in the Ni2p signals, <\/li>\n\n\n\n<li>b) the fine structure of the NiLMM Auger lines, <\/li>\n\n\n\n<li>c) the percentage of the satellite in the total Ni2p3\/2 spectrum and <\/li>\n\n\n\n<li>d) the density of states in the valence band in the region of the Ni3d electrons, <\/li>\n<\/ul>\n\n\n\n<p>All these parameters are related to the electronic structure of the Ni-P alloys. It is the first time that the influence of ligand concentration (here phosphorus) on the electronic structure of the nickel based alloys could be described and rationalized with a screening model proposed in literature for clarifying the role of the substituents on the electronic structure of conducting nickel compounds. <\/p>\n\n\n\n<div class=\"wp-block-media-text is-stacked-on-mobile\" style=\"grid-template-columns:32% auto\"><figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" decoding=\"async\" width=\"325\" height=\"310\" src=\"https:\/\/sites.unica.it\/superfici\/files\/2025\/08\/NiP_el_struct.gif\" alt=\"\" class=\"wp-image-161 size-full\" \/><\/figure><div class=\"wp-block-media-text__content\">\n<p>The XPS Ni2p and P2p core lines as well as the x-ray induced Auger PKLL and NiLMM remain constant irrespective of the phosphorus content (6 &#8211; 29 at%) in the sputtered Ni-P alloys. This indicates that the phosphorus content does not induce changes in the formal net charge on P and Ni atoms in the alloy. Only the systematic varriation of the binding energy difference between the two states in the Ni2p spectra (Ni2p3\/2 main peak and its satellite, see figure) indicates a change in the electronic structure of the alloy with increasing phosphorus content.\u00a0<\/p>\n<\/div><\/div>\n\n\n\n<p>It is proposed that\u00a0increasing phosphorus content in electrodeposited, sputter cleaned Ni-P alloys leads to a decreasing number of non-bonding Ni3d electrons, thus the screening of the core hole is less pronounced and the binding energy of the satellite associated to the final state with a filled Ni4s shell increases.\u00a0The lower number of \u201cmetallic\u201d non-bonding Ni3d electrons results in a lowered screening of the valence band region, hence a deeper potential well after core hole formation, and explains the increasing binding energy difference of the final state Ni2p satellite peak with increasing phosphorus content.\u00a0<\/p>\n\n\n\n<p><strong>Publication:<\/strong> B. Elsener, A. Krolikowski, D. Atzei, A. Rossi, Effect of phosphorus concentration on the electronic structure of Ni-P nanocrystalline electrodeposited alloys: an XPS \/ XAES study, Surface and Interface Analysis\u00a0 40 (2008) 919 &#8211; 926 \u00a0doi\u00a0<a href=\"http:\/\/doi.wiley.com\/10.1002\/sia.2802\" target=\"_blank\" rel=\"noreferrer noopener\">10.1002\/sia.2802<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Effect of phosphorus concentration on the electronic structure of Ni-P nanocrystalline alloys A series of electrodeposited nickel-phosphorus alloys ranging from 6 to 29 at% of phosphorus have been analyzed by surface analysis using x-ray photoelectron spectroscopy [&hellip;]<\/p>\n","protected":false},"author":335,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-157","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/sites.unica.it\/superfici\/wp-json\/wp\/v2\/pages\/157","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sites.unica.it\/superfici\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/sites.unica.it\/superfici\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/sites.unica.it\/superfici\/wp-json\/wp\/v2\/users\/335"}],"replies":[{"embeddable":true,"href":"https:\/\/sites.unica.it\/superfici\/wp-json\/wp\/v2\/comments?post=157"}],"version-history":[{"count":3,"href":"https:\/\/sites.unica.it\/superfici\/wp-json\/wp\/v2\/pages\/157\/revisions"}],"predecessor-version":[{"id":163,"href":"https:\/\/sites.unica.it\/superfici\/wp-json\/wp\/v2\/pages\/157\/revisions\/163"}],"wp:attachment":[{"href":"https:\/\/sites.unica.it\/superfici\/wp-json\/wp\/v2\/media?parent=157"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}