Compositionally Complex Alloys: Some Insights from Photoemission Spectroscopy

Scientific paper - Original scientific paper

• Author: Petar Pervan
• Author: Vesna Mikšić Trontl
• Author: Ignacio Alejandro Figueroa
• Author: Tonica Valla
• Author: Ivo Pletikosić
• Author: Emil Babić
• Author's institution: University of Zagreb; Faculty of Science; (Department of Physics)
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract (english)

Photoemission spectroscopy (PES) is an underrepresented part of current and past studies of compositionally complex alloys (CCA) such as high-entropy alloys (HEA) and their derivatives. PES studies are very important for understanding the electronic structure of materials, and are therefore essential in some cases for a correct description of the intrinsic properties of CCAs. Here, we present several examples showing the importance of PES. First, we show how the difference between the split-band structure and the common-band structure of the valence band (VB), observed by PES, can explain a range of properties of CCAs and alloys in general. A simple description of the band crossing in CCAs composed from the early and late transition metals showing a split band is discussed. We also demonstrate how a high-accuracy PES study can determine the variation in the density of states at the Fermi level as a function of Cu content in Ti-Zr-Nb-Ni-Cu metallic glasses. Finally, the first results of an attempt to single out the contributions of particular constituents in Cantor-type alloys to their VBs are presented. The basic principles of PES, the techniques employed in studies presented, and some issues associated with PES measurements are also described.

• Keywords (english): compositionally complex alloys; high-entropy alloys; metallic glasses; amorphous alloys; electronic structure; electronic density of states—DOS; photoemission spectroscopy; UPS; XPS
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Materials
• Numbering: vol. 16, no. 4, 1486
• e-ISSN: 1996-1944
• DOI: https://doi.org/10.3390/ma16041486
• URN:NBN: urn:nbn:hr:217:228747
• Publication: 2023-02-10
• Project: Number: KK.01.1.1.02.0013; Title (croatian): Centar za Napredna Istraživanja Kompleksnih Sustava; Title (english): Centre for Advanced Research of Complex Systems; Acronym: CeNIKS; Leader: Mihael Srđan Grbić; Jurisdiction: Croatia; Funding stream: EFRR
• Document URL: https://www.mdpi.com/1996-1944/16/4/1486
• Type of resource: Text
• Access conditions: Open access
• Public note: © 2023 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Received: 30 December 2022; Revised: 1 February 2023; Accepted: 7 February 2023; Published: 10 February 2023.
• Created on: 2023-08-23 10:17:04