A new eight-cation inverse high entropy spinel with large configurational entropy in both tetrahedral and octahedral sites: Synthesis and cation distribution by X-ray absorption spectroscopy. (November 2020)

• Record Type: Journal Article
• Authors: Fracchia, Martina; Manzoli, Maela; Anselmi-Tamburini, Umberto; Ghigna, Paolo
• Is Part Of: Scripta materialia. Number 188(2020)
• Page Start: 26
• Page End: 31
• Publication Date: 2020-11
• Subjects: High entropy oxides -- Spinels -- Configurational entropy -- Inversion -- Entropy-stabilized oxides; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2020.07.002
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: In this work we report the synthesis of (Co, Mg, Mn, Ni, Zn)(Al, Co, Cr, Fe, Mn)2 O4 in a single-phase spinel structure (space group F d 3 ¯ m). The chemical homogeneity and purity of the sample were checked through X-ray diffraction, high resolution transmission electron microscopy and energy dispersive X-ray spectroscopy. The analysis of the pre-edge peaks of the X-ray absorption spectra for all the transition metals clearly indicated the presence of a partial degree of inversion in the spinel structure. This material is characterized by a particularly large configurational entropy, regarding both the A and the B sites, leading to a total value equal to 3.3 in R unit. Graphical abstract: Image, graphical abstract